Abstract
Melanoma is the utmost fatal kind of skin neoplasms. Molecular changes occurring during the pathogenic processes of initiation and progression of melanoma are diverse and include activating mutations in BRAF and NRAS genes, hyper-activation of PI3K/AKT pathway, inactivation of p53 and alterations in CDK4/CDKN2A axis. Moreover, several miRNAs have been identified to be implicated in the biology of melanoma through modulation of expression of genes being involved in these pathways. In the current review, we provide a summary of the bulk of information about the role of miRNAs in the pathobiology of melanoma, their possible application as biomarkers and their emerging role as therapeutic targets for this kind of skin cancer.
Introduction
Arising from unrestrained proliferation of melanocytes, melanoma is the utmost fatal kind of skin neoplasm (). Though melanoma encompasses less than 5% of all skin cancers, it accounts for most of skin neoplasms mortalities (). When the cancer is diagnosed in early stages, surgical resection of the tumor is the appropriate therapeutic options for enhancement of survival of patients. Yet, based on the metastatic potential of melanoma, surgery is not satisfactory in advanced stages of melanoma (). Although the mortality rate of primary melanoma is about 11%, metastatic melanoma has a poor prognosis resulting from inefficiency of conventional therapies (, ). Meanwhile, novel therapeutic option might offer efficient methods for these patients. For instance, immunotherapeutic approaches such as administration of Anti-PD1 (nivolumab, pembrolizumab) alone, or the combination of anti-PD1 with anti-cytotoxic T lymphocyte-associated protein 4 (CTLA4) ipilimumab has raised the survival of patients who suffer from advanced stages of melanoma ().
Targeted therapies, like combinations of BRAF inhibitors (Dabrafenib) and MEK inhibitors (vemurafenib) are also frequently used on BRAFV600E mutant melanomas. Superficial spreading, nodular, lentigo maligna and acral lentiginous melanomas represent the main types of melanoma with the first one being the most frequent type (). Ultraviolet radiation and melanocytic nevi are two main risk factors for development of this kind of skin cancer (). Molecular changes occurring during the pathogenic processes of initiation and progression of melanoma are diverse and include activating mutations in BRAF and NRAS genes, hyper-activation of PI3K/AKT pathway, inactivation of p53 and alterations in CDK4/CDKN2A axis (). In addition, several studies have shown the critical role of microRNAs (miRNAs) both in the initiation and in the progression of melanoma (). These transcripts have sizes around 22 nucleotides and are generated through a multi-step process from DNA sequences into primary, precursor and mature miRNAs, respectively. As a general rule, they regulate gene expression through binding with complementary sequences in the 3′ untranslated region (3′ UTR) of mRNAs and subsequently lead to degradation and suppression of translation of the target transcript. Less frequently, they interact with the 5′ UTR, coding or promoter regions (). Moreover, there are some reports of activation of translation of certain genes by miRNAs in some situations. For instance, let-7 family of miRNAs can induce translation when cell cycle is arrested in spite of their inhibitory effects on translation during cell proliferation (). Therefore, miRNAs are regarded as important mediators of gene expression. Besides, their presence in extracellular vesicles provides them the opportunity to module communication between various cells (). In the current paper, we summarize the bulk of information about the role of miRNAs in the pathobiology of melanoma, their possible application as biomarkers and their emerging role as therapeutic targets for this kind of skin cancer.
Dysregulated miRNAs in Melanoma
Expression pattern of miRNAs in melanoma cell lines and clinical specimens has been assessed by both high throughput and candidate gene approaches. An example of the former types of studies is the study conducted by Zhang et al. (). They reported DNA copy number changes in miRNA coding genes in the majority of the assessed melanoma samples. Notably, miRNA copy alterations have been correlated with miRNA expression. Moreover, they reported copy number alterations in genes contributing in the biogenesis or function of miRNAs in tumor samples (). Through a microarray-based technique, Aksenenko et al. have identified differential expression of 143 miRNAs between melanoma samples and adjacent skin tissues. Among the dysregulated miRNAs has been the up-regulated miRNA hsa-miR-146a-5p which has been predicted to be associated with Toll-like receptor, NF-κB and ErB pathways. Moreover, this miRNA has been shown to target one of the most recurrently mutated genes in melanoma i.e., the NRAS gene ().
miRNA also affect activity of melanoma-related signaling pathways. Figure 1 depicts the functional association between two miRNAs and AKT and NF-κB signaling pathways.
Figure 1
Expression profiling of miRNAs in melanocytes and melanoma cells originated from primary or metastatic melanoma cells has provided valuable data about the role of miRNAs in each phase of cancer development. A panel of miRNAs including miR-133a, miR-199b, miR-453, miR-520f, miR-521, and miR-551b has been found consistently up-regulated in the course of cancer development from melanocytes to primary cancerous cell and from primary to metastatic melanomas. On the other hand, miR-190 had the opposite trend during this course. Furthermore, expressions of miR-126, miR-29c, miR-506, miR-507, and miR-520d* have been found to be increased during the early progression of melanoma and have been decreased in the metastatic phase. Two other miRNAs including miR-489 and miR-527 had the opposite pattern of expression (
Other studies have reported dysregulation of several other miRNAs in the melanoma samples. Among up-regulated miRNAs are miR-221 and miR-222 which induce malignant features through decreasing expression of c-KIT receptor and p27Kip. Both miRNAs promote epithelial-mesenchymal transition (
Table 1
| microRNA | Samples | Assessed cell lines | Functional analysis | Gene interaction | Signaling pathway | Association with clinical features | Function | Reference |
|---|---|---|---|---|---|---|---|---|
| miR-211 | SCID mice (SKMEL28 or SK-P8-2 or 501-Mel and 501-Mel-P5-5 cell lines were injected to mice) | SKMEL28, vemurafenib-resistant SKMEL28 and 501-Mel cell lines | Yes | – | PI3K signaling pathway | – | Has oncogenic role. Its deletion attenuates proliferation, invasion and tumorigenicity and inhibits PI3K signaling. Also induces metabolic vulnerability of melanoma cells and sensitizes vemurafenib resistant cells to vemurafenib | ( |
| miR-211-5p | NOD/SCID/IL2gR-/- (NSG) mice (A375 cell line was injected to mice) | A375, SK-Mel-103, SK-Mel-28, SK-Mel-147 | Yes | NUAK1, SLUG | – | – | Promotes proliferation and induces resistance to vemurafenib and MEK inhibitor trametinib in melanoma cells | ( |
| miR-211-5p | 86 melanoma tissues, serum samples from 130 healthy controls and 255 melanoma patients | – | No | – | – | Disease stage, survival | A possible diagnostic biomarker | ( |
| miR-16 | 86 melanoma tissues, serum samples from 130 healthy controls and 255 melanoma patients | – | No | – | – | Disease stage | A possible diagnostic biomarker | ( |
| miR-204-5p | NOD/SCID/IL2gR-/- (NSG) mice (A375 cell line was injected to mice) | A375, SK-Mel-103, SK-Mel-28, SK-Mel-147 | Yes | EFNB2, NUAK1, SLUG | – | – | Promotes proliferation and induces resistance to vemurafenib and MEK inhibitor trametinib in melanoma cells | ( |
| miR-378 | 36 melanoma tissues and paired ANTs, 14 Nude athymic BalB/C mice (A875 cell line was injected to mice) | A875, A375 | Yes | FOXN3 | Wnt/β-catenin signaling pathway | lymph node metastasis | Induces migration and invasion and activates EMT process in melanoma cells through downregulation of FOXN3 and activation of Wnt/β-catenin pathway | ( |
| miR-378a-5p | FFPE tissues specimens of 27 metastatic melanoma and 13 in situ melanoma, female mice (M14 cell line was injected to mice) | M14, A375, SBCL1, HUVEC | Yes | STAMBP, HOXD10 | – | – | Enhances migration, invasion and angiogenesis ability of melanoma cells | ( |
| miR-1908 | 71 paraffin-embedded melanoma skin lesions, NOD scid, NOD scid gamma, athymic nu/nu, and C57Bl6 mice (MeWo-LM2 cell line was injected to mice) | MeWo-LM2, A375, SK-Mel-2, WM-266-4, HT-144, A2058, HUVECs | Yes | ApoE, DNAJA4 | ApoE signaling | shorter metastasis-free survival | Augments invasion, metastasis, metastatic endothelial recruitment (MER) and angiogenesis in melanoma cells through targeting ApoE and DNAJA4 | ( |
| miR-199a-3p | Yes | ApoE, DNAJA4 | ApoE signaling | shorter metastasis-free survival | ( | |||
| miR-199a-5p | Yes | ApoE, DNAJA4 | ApoE signaling | shorter metastasis-free survival | ( | |||
| miR-106b | 97 primary cutaneous melanoma tissue samples, 17 melanoma metastases, 15 dysplastic nevi | – | No | – | – | Poor prognosis, Breslow thickness, tumor ulceration, advanced clinical stage | May implicate in progression of cutaneous melanoma and can be a potential prognostic biomarker | ( |
| miR-106a | – | A375, A2058, HEMn, | Yes | Cx43 | – | – | Enhances melanoma cells proliferation via suppression of Cx43 | ( |
| miR-146a | FFPE tissue specimens of 22 primary melanoma tumors, 18 nevocellular nevi, 13 healthy skin samples, wild type and miR146a-/- C57BL/6 mice (B16.F10 cell line was injected to mice) | B16.F10 | Yes | Stat1 | – | TNM stage | Negatively regulates immune responses. also affects proliferation, migration and mitochondrial fitness of melanoma cells through regulating STAT1/IFNγ axis | ( |
| miR-146a | Mice (A375 cell line was injected to mice) | A375, MA-1, MC-1, MA-2, MC-2, WK-Mel | Yes | LFNG, NUMB, ITGAV, ROCK1 | NOTCH/PTEN/Akt pathway | – | Has dual function. It enhances melanoma cell growth but inhibits metastasis formation (and is poorly expressed in circulating tumor cells) | ( |
| miR-146a | 10 primary melanoma and nevus tissues from the same patients and 15 primary melanoma tissues and metastases from the same patients | WI-38, IMR-90t, 293T, SKMEL28 | Yes | NUMB | Notch signaling pathway | – | Increases proliferative ability and tumorigenecity of melanoma cells through targeting NUMB | ( |
| miR-146a | 55 melanoma tissues and paired ANTs | A375, WM115, M14, G361, HACAT | Yes | SMAD4 | – | TNM stage, lymph node metastasis | Promotes migration and invasion of melanoma cells through targeting SMAD4 | ( |
| miR-10b | FFPE tissue specimens of 40 primary melanomas that are metastasis-free, 39 primary melanomas with metastasis, 32 metastases | – | No | – | – | Tumor metastasis | Is a potential prognostic biomarker in detection of thicker melanomas that have enhanced risk of metastasis | ( |
| miR-10b | – | Mel 505, PMWK, sk-mel-28, sk-mel-24, VMM39, MEL 224, YUHEF, YUROB, | Yes | – | – | – | Its expression positively correlates with B-RafV600E mutation and increases anchorage-independent growth of B-Raf wild-type melanoma cells | ( |
| miR-10b | 78 melanoma tissues and 30 non-tumor skin samples, nude mice (A375 cell line was injected to mice) | A375, SK-MEL-1, SK-MEL-28, WM451, human primary melanocytes | Yes | ITCH | Wnt/β-catenin signaling pathway | Overall survival | Its knockdown results in ITCH-mediated suppression of proliferation, migration and invasion in melanoma cells. | ( |
| miR-21 | 67 malignant melanoma tissue and 67 normal control skin samples | – | No | PDCD4 | – | tumor size, higher Clark classification level, lymph node metastases | Can be a possible biomarker or therapeutic target in melanoma | ( |
| miR-21 | 86 primary cutaneous melanomas tissues, 10 melanoma metastases, 10 dysplastic nevi samples | HTB-67, A375 | Yes | – | – | Overall survival, Breslow thickness, advanced clinical stage, | Its silencing suppresses growth and increases apoptosis, chemosensitivity and radiosensitivity of melanoma cells | ( |
| miR-21 | 12 FFPE primary melanoma tissues and 12 melanocytic nevi | WM9, WM35b, WM451, WM793, WM951, WM1205, SKMel23, SKMel113, MV3, MEWO | Yes | Cdc25a | – | Recurrence-free survival, overall survival | Its downregulation promotes apoptosis. | ( |
| miR-21 | female 01B74 Athymic NCr-nu/nu mice (A375 cell line was injected to mice) | WM1552c, WM793b, MEL 39, A375 | Yes | TIMP3 | – | – | Increases invasive ability of melanoma cells through targeting TIMP3 | (39) |
| miR-21 | 45 melanoma tissues and ANTs | A375 | Yes | SPRY1, PDCD4, PTEN | ERK/NF-κB signaling pathway | histological differentiation, TNM stage, lymphatic metastasis | Its inhibition decreases proliferation, migration and invasion and induces apoptosis | (40) |
| miR-21 | BALB/c nude mice (OCM-1 cell line was injected to mice) | OCM-1, M619, MuM-2B | Yes | p53 | – | – | Promotes proliferation, migration and invasion of melanoma cells through targeting p53 | (41) |
| miR-21-5p | 20 melanoma tissues and paired ANTs | A375, M14 | Yes | CDKN2C | – | – | Enhances proliferation and cell cycle G1/S transition in melanoma cells through targeting CDKN2C | (42) |
| miR-652 | 26 uveal melanoma tissues and paired ANTs | MUM-2B, MEL270, ARPE-19 | Yes | HOXA9 | HIF-1alpha signaling | – | Increases proliferation and migration in uveal melanoma cell through promoting HIF-1alpha signaling by suppression of HOXA9 | (43) |
| miR-367 | 28 uveal melanoma tissues and paired ANTs | M17, M23, MUM-2B, C918, um95 | Yes | PTEN | – | – | Enhances proliferation and migration in uveal melanoma cell via targeting PTEN | (44) |
| miR-4286 | FFPE specimens of 16 melanoma tissues and 3 melanocytic nevi samples | BRO, SK-MEL-1 | Yes | APLN, FPGS, GPR55, HMGA1, RRN3, TP523 | – | – | Its inhibition results in decreased proliferation and increased apoptosis. | (45) |
| miR-367 | 50 melanoma tissues and 25 benign nevi tissues, 6 Nude mice (A375 cell line was injected to mice) | A375, WM35, SK-MEL-5, SK-MEL-2, HEMa-LP | Yes | PTEN | – | Decreased overall survival, tumor thickness, TNM stage, lymph node involvement, distant metastasis | Elevates proliferation, migration and invasion in cutaneous melanoma cells through targeting PTEN | (46) |
| miR-638 | 7 primary melanomas, 9 lymph node metastases, and 8 remote skin metastases | BRO, A-375, HT144, RPM-MC, 1F6, HEM, SK-Mel-147, SK-Mel-28 | Yes | TP53INP2 | p53 signaling pathway | – | Enhances proliferation and invasion of melanoma cells and prevents apoptosis and autophagy via targeting TP53INP2 | (47) |
| miR-338-5p | 46 melanoma tissues and 25 normal nevi samples, Nude mice (A375 cell line was injected to mice) | A375, WM35, SK-MEL-5, SK-MEL-2, HEMa-LP | Yes | CD82 | AKT pathway | Poor Prognosis, patients survival, tumor stage, metastasis | Promotes proliferation and metastasis via targeting CD82 | (48) |
| miR-363-3p | – | A2058, WM793B | Yes | p21 | – | – | Promotes stemness of melanoma cells via suppression of p21 | (49) |
| miR-15b | 128 FFPE tissues of primary melanomas and 11 melanocytic nevi samples | WM9, WM35, WM451, WM793, WM951, WM1205, SKMel23, SKMel113, MV3, MeWo | Yes | – | – | Overall survival | Its knockdown decreases proliferation and induces apoptosis. | (50) |
| miR-454 | 25 uveal melanoma tissues and ANTs | OCM‐1A, MUM‐2C, C918, MUM‐2B, D78 | Yes | PTEN | – | – | Promotes cell proliferation, colony formation and invasion uveal melanoma cells | (51) |
| miR-214 | 57 primary melanoma tissues, 13 in situ melanomas and 18 cutaneous metastases, female CD1 nude mice (A375 or 106 WK‐Mel, GR4‐Mel, 1300‐Mel, SK‐Mel‐173 and SK‐Mel‐197 cell lines were injected to mice) | 293T, MDA-MB-231, 4T1, A375, 1300-Mel, GR4-Mel, WK-Mel, Dett-Mel, SK-MEL-103, SK-MEL-173, SK-MEL-187, SK-MEL-197, HEMa-LP | Yes | TFAP2C | – | – | Enhances cell movement and metastasis via suppression of TFAP2C | (52) |
| miR-122-5p | Human melanoma tissues and pigmented nevus tissues | 293T, SK-MEL-110, A375 | Yes | NOP14 | – | – | Its inhibition represses proliferation and induces cell cycle arrest at G1 phases through regulation of NOP14 | (53) |
| miR-182 | 22 primary melanoma tissues, 59 metastatic melanoma tissues and 19 nevi samples, C57BL/6J mice (B16F10 cell line was injected to mice) | SK-MEL-19, SK-MEL-29, SK-MEL-85, SK-MEL-94, SK-MEL-100, SK-MEL-103, SK-MEL-147, SK-MEL-173, SK-MEL-187, SK-MEL-192, SK-MEL-197, 501mel, HEK293T, A375, B16F10, WM35 | Yes | FOXO3, MITF-M | – | – | Enhances migration, invasion and metastasis in melanoma cells through suppression of FOXO3 and MITF-M expression | (54) |
| miR-221 | Serum samples from 72 cutaneous malignant melanoma and 54 healthy controls | – | No | – | – | Patient survival, tumor thickness, differentiation, T classification, N classification, metastasis, advanced clinical stage | Can be a potential prognostic biomarker in cutaneous melanoma | (55) |
| miR-221 | – | WM35, WM983A, WM164, 1205Lu | Yes | cKit, p27 (Kip1) | – | – | Promotes proliferation of melanoma cells through targeting cKit and p27. Also its inhibition induces apoptosis | ( |
| miR-767 | 8 melanoma tissues and ANTs | MeWo, MHEM, A375, WM-115, UACC257, WM35, A7, PEM | Yes | CYLD | – | – | Enhances proliferation of melanoma cells through inhibition of CYLD | (56) |
| miR-135a | 20 melanoma tissues and paired ANTs | HEM, sk-mel-1, A375 | Yes | FOXO1 | AKT signaling pathway | – | Promotes melanoma cells proliferation, tumorigenicity and cell cycle progression via targeting FOXO1 | ( |
| miR-135b | 20 melanoma tissues and paired ANTs | A-375 | Yes | LATS2 | – | – | Its inhibition decreases proliferation and migration and induces apoptosis in melanoma cells | (57) |
| miR-25 | – | A875, MV3, M14, uacc-257, HEM-a | Yes | RBM47 | PI3K/Akt/mTOR signaling pathway | – | Promotes proliferation and migration of melanoma cells through targeting RBM47 | (58) |
| miR-25 | 30 primary melanoma tissues and related non-cancerous skin samples | HEM, MV3, SK-HEP-1, A375 | Yes | DKK3 | WNT/β-Catenin signaling Pathway | – | Enhances proliferation and invasion in melanoma cells via targeting DKK3 | (59) |
| miR-125a | 22 melanoma tissue | SK-MEL-239, A375, 451Lu | Yes | BAK1, MLK3 | – | – | Promotes BRAF inhibitors resistance through inhibition of intrinsic apoptotic pathway by targeting BAK1 and MLK3 | (60) |
| miR−106b−5p | 18 primary melanoma tissues and 18 benign nevi | SK-MEL-1, A-375, HEM | Yes | PTEN | Akt/ERK signaling pathway | – | Promotes proliferation and progression of melanoma through targeting PTEN and regulation of Akt/ERK pathway | (61) |
| miR-181b | 3 uveal melanoma tissues and 3 normal tissues | SP6.5, VUP, OCM1, 92-1, MUM2b | Yes | CTDSPL | – | – | Promotes cell cycle progression in uveal melanoma cells through targeting CTDSPL | (62) |
| miR-769 | 8 melanoma tissues and ANTs | g MHEM, SK-MEL-28, WM-115, UACC257, A375, A7, MeWo, PEM | Yes | GSK3B | – | – | Enhances proliferation of melanoma cells via targeting GSK3B and suppression of its expression | (63) |
| miR−20a | 10 uveal melanoma tissues and 10 normal uveal tissues | MUM-2B, MUM-2C, D78 | Yes | – | – | – | Promotes proliferation, migration and invasion in uveal melanoma cells | (64) |
| miR-30d | 109 primary melanoma tissues and 17 melanoma metastases | HEK293T, A375, B16F10, WM35, WM98 | Yes | GALNT7 | – | Overall survival, tumor thickness, tumor stage, shorter time to recurrence | Promotes metastatic capacity of melanoma cells through targeting GALNT7 | (65) |
| miR-30b | 109 primary melanoma tissues and 17 melanoma metastases | HEK293T, A375, B16F10, WM35, WM98 | Yes | – | – | Overall survival, tumor thickness, tumor stage, shorter time to recurrence | Promotes metastatic capacity of melanoma cells | (65) |
| miR-224 | Primary melanoma tissues and melanoma metastases, athymic NMRI nude mice | SK-Mel-28, SK-Mel-29, SK-Mel-103, SK-Mel-147 | Yes | TXNIP | – | – | Increases migration and invasion and induces EMT process through targeting TXNIP | (66) |
| miR-452 | Primary melanoma tissues and melanoma metastases, athymic NMRI nude mice | SK-Mel-28, SK-Mel-29, SK-Mel-103, SK-Mel-147 | Yes | TXNIP | – | – | Increases migration and invasion and induces EMT process through targeting TXNIP | (66) |
| miR-19b | 14 melanoma tissues, C57BL/6 mice | 293T, A2058, CRL1579, SKMEL28, G361, HNEM | Yes | PITX1 | – | – | Regulates proliferation and hTERT expression in melanoma cells through targeting PITX1 | (67) |
| miR-3151 | 21 RNA samples of melanoma patients | MM A375, Mel-39, MeWo, HEK293, A375 | Yes | TP53 | – | – | Its knockdown induces TP53-mediated inhibition of proliferation and promotion of apoptosis in melanoma cells | (68) |
| miR-301a | 46 melanoma tissues and 18 benign melanocytic naevi | SK-MEL-1, A-375 | Yes | PTEN | Akt and FAK signaling pathways | Poor prognosis, metastasis | Its inhibition suppresses proliferation, colony formation, migration and invasion in melanoma cells through targeting PTEN. | (69) |
| miR-4262 | 110 cutaneous melanoma tissues and ANTs | HACAT, HFF, A375, Malme-3M, SK-MEL-2, SK-MEL-5, M14 | Yes | KLF6 | – | – | Promotes proliferation of melanoma cells through targeting KLF6 | (70) |
| miRNA-106b | Female athymic nude mice (A375 cell line was injected to mice) | A375, Hs294t, SK-Mel28, SK-Mel 119, Mel 1241, Mel 1011, Mel 928, NHEM | Yes | – | – | – | Its downregulation inhibits melanoma cells proliferation and induces cell cycle arrest at G1 phase | (71) |
| miR-519d | 21 primary melanoma tissues, 19 normal skin and 21 metastatic melanoma samples, C.B-17/Icr-scid mice (A2058 cell line was injected to mice) | A2058, SK-Mel-28, A375, SK-Mel-90, MeWo | Yes | EphA4 | ERK1/2 signaling pathway | – | Promotes proliferation, migration and invasion of melanoma cells via downregulation of EphA4 | (72) |
| miR-370 | 41 melanoma tissues and ANTs, BALB/c nude mice (A375 cell line was injected to mice) | SK-MEL-1, A375, HEMn-LP | Yes | PDHB | – | TNM stage | Promotes proliferation, invasion and glycolysis in melanoma cells and induces apoptosis through targeting PDHB | (73) |
| miR-373 | 16 melanoma tissues and normal skin samples | A375, WM115, WM75, mela | Yes | SIK1 | – | – | Promotes migration of melanoma cells through targeting SIK1 | (74) |
| miR-92a | 75 melanoma tissues and paired ANTs | A375.S2, A7, MeWo, RPMI-7951, SK-MEL-5, SK-MEL-24, SKMEL-28, PEM | Yes | – | – | Overall survival, tumor stage, lymph node metastasis, distant metastasis | Its knockdown suppresses proliferation and migration of melanoma cells | (75) |
| miR-517 | 62 melanoma tissues and 40 normal skin tissues | HACAT, A375, G-361, OCM-1 | Yes | CDKN1C | JNK signaling pathway | – | Its silencing induces oxidative stress injury in melanoma cells through upregulation of CDKN1C and inactivation of JNK signaling pathway | (76) |
| miR-27a | 43 paraffin‐embedded melanoma tissues and 22 pigmented nevus samples, female BALB/c nude mice (A375 cell line was injected to mice) | Mel‐RM, A375 | Yes | SYK | mTOR signaling pathway | TNM staging, lymph node metastasis | Its silencing promotes autophagy and apoptosis in melanoma cells through SYK-mediated modulation of mTOR signaling pathway | (77) |
| miR-186 | 8 melanoma tissues and ANTs | A375-S2, SKMEL-28, SKMEL-5, MeWO, RPMI-7951, NHEM | Yes | CYLD | – | – | Enhances proliferation and anchorage-independent growth of melanoma cells via downregulation of CYLD | (78) |
| miR-1246 | Tissues from 43 melanoma patients | HEM, A375, A2058 | Yes | FOXA2 | – | – | promoted cell viability and metastasis in melanoma cells via targeting FOXA2 | (79) |
| miR-150 | 20 melanoma tissues and paired ANTs | M14, A357, WM115, NHEM | Yes | PDCD4 | – | – | Its silencing inhibits cell proliferation, migration and invasion and induces apoptosis in melanoma cells. | (80) |
| miR-520f | 10 melanoma and paired ANTs | UACC257, WM-115, A7, MeWo, A375, NHEM, WM-115, PEM | Yes | ITCH | – | – | Promotes proliferation, colony construction and anchorage-independent growth in melanoma cells via targeting ITCH | (81) |
| miR−633 | 11 melanoma tissues and 10 ANTs | A375, A2058, B16, MEL-RM and M21 | Yes | KAI1 | – | – | Raises migratory ability and proliferation of melanoma cells via targeting KAI1 and reducing KAI1 expression | (82) |
List of over-expressed miRNAs in melanoma.
Numerous tumor suppressor miRNAs have been down-regulated in melanoma samples. For instance, while miR-34a is constantly detected in normal melanocytes, it is not expressed in uveal melanoma cells. Forced over-expression of this miRNA in uveal melanoma cells remarkably diminishes their growth and migratory abilities. Mechanistically, this miRNA inhibits expression of c-Met protein and decreases the levels of phosphorylated Akt and cell cycle-related proteins (83). Besides, miR-34b, miR-34c, and miR-199a* have been shown to down-regulate MET expression, suppressing the invasive growth features in the melanoma cells (84). Furthermore, expressions of the let-7 miRNAs have been shown to be decreased in primary melanomas compared with benign nevus samples. Forced up-regulation of let-7b in melanoma cells has led to significant decrease in the expression of cyclins D1, D3, and A, and CDK4. The functional interaction between let-7b and cyclin D1 has been verified through in vitro experiments (85). The inhibitory effect of let-7a on expression of integrin beta 3 has been verified in another study (86). In addition, functional studies have shown the role of miR-155 in the suppression of proliferation of a number of melanoma cell lines and induction of apoptosis in these cells (
Table 2
| microRNA | Samples | Assessed cell lines | Functional analysis | Gene interaction | Signaling pathway | Association with clinical features | Function | Reference |
|---|---|---|---|---|---|---|---|---|
| miR-429 | 6 BALB/c-nu mice (A375 cell line was injected to mice) | A-375, 293T | Yes | AKT1 | – | – | Represses proliferation and migration of melanoma cells by targeting AKT1 | (87) |
| miR-429-5p | 55 melanoma tissues and normal skin tissues | A375, PEM | Yes | LIMK1 | – | Tumor thickness, tumor stage | Blocks migration and invasion of melanoma cells through targeting LIMK1 | (88) |
| miRNA-326 | 23 melanoma tissues and paired ANTs | SK-MEL-28, A375, HT144, A2058, HEMs | Yes | KRAS | AKT and ERK signaling pathways | – | Suppresses cell proliferation and invasion and promotes apoptosis through downregulation of KRAS and inactivating AKT and ERK signaling pathways | (89) |
| miR-34b | 5 uveal melanoma tissues and ANTs | SP6.5 | Yes | c-Met | – | – | Its overexpression expression inhibits melanoma cells proliferation and migration and induces cell cycle arrest by targeting c-Met | (90) |
| miR-34c | 5 uveal melanoma tissues and ANTs | SP6.5 | Yes | c-Met | – | – | Its overexpression expression inhibits melanoma cells proliferation and migration and induces cell cycle arrest by targeting c-Met. | (90) |
| miR-34a | – | M17, M23, SP6.5, U-96 | Yes | LGR4, MMP2 | – | – | Its overexpression decreases migration and invasion of uveal melanoma cells through targeting LGR4 and regulation of EMT process. | (91) |
| miR-34a | 6 in situ melanoma tissues, 6 metastatic melanoma tissues, 6 nevi tissue and 18 ANTs | WM35, WM451, A375 | Yes | FLOT2 | – | – | Its overexpression represses proliferation and metastasis in melanoma cells via targeting FLOT2. | (92) |
| miR-34a | 3 uveal melanoma tissues | M17, M21, M23, SP6.5, D78, HEK-293 | Yes | c-Met | Akt and ERK1/2 signaling pathways | – | Suppresses proliferation and migration of uveal melanoma cells through downregulation of c-Met | (83) |
| miR-34a | Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice) | C8161 (HAG), C81-61 (PAG) | Yes | – | – | – | Suppresses proliferation, invasion and tube formation in melanoma cells | (93) |
| miR-184 | Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice) | C8161 (HAG), C81-61 (PAG) | Yes | – | – | – | Suppresses proliferation, invasion and tube formation in melanoma cells | (93) |
| miR-182 | Uveal melanoma tissues and normal uveal tissues, Female nude mice (M23 and SP6.5 cell lines were injected to mice) | M23, SP6.5, HEK-293 | Yes | MITF, BCL2 and cyclin D2 | Akt and ERK1/2 signaling pathways | – | Inhibits cell proliferation, migration and invasion and promotes apoptosis in melanoma cells | (94) |
| miR-185 | Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice) | C8161 (HAG), C81-61 (PAG) | Yes | – | – | – | Suppresses proliferation, invasion and tube formation in melanoma cells | (93) |
| miR-185 | 52 cutaneous melanoma tissues, 41 uveal melanoma tissues and 35 normal skin specimens | G361, GR-M, OCM-1 | Yes | IL-10Rα | – | – | Its ectopic expression decreases proliferation of all melanoma cell lines through targeting IL-10Rα | (95) |
| miR-204 | Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice) | C8161 (HAG), C81-61 (PAG) | Yes | – | – | – | Suppresses proliferation, invasion and tube formation in melanoma cells | (93) |
| miR-365 | Skin Cutaneous Melanoma (SKCM) dataset for 470 melanoma samples was downloaded from TCGA | NHEM, A375, A2058, SK-MEL-2, SK-MEL-28 | Yes | BCL2, CCND1 | – | – | Inhibits cell proliferation, migration and invasion and promotes apoptosis in melanoma cells. | (96) |
| miR-365 | 40 melanoma tissues and paired ANTs, female BALB/c nude mice (A375 cell line was injected to mice) | A375, G361, LIBR, HME1 | Yes | NRP1 | – | lymph node metastasis, clinical stage, overall survival, relapse-free survival | Inhibits melanoma growth and metastasis by targeting NRP1 | (97) |
| miR-485-5p | 20 human primary melanoma tissues and paired ANTs | A375, SK-HEP-1, SK-MEL-1, MV3, HPM | Yes | FZD7 | wnt signaling pathway | – | Suppresses proliferation and invasion of melanoma cells through targeting FZD7 and consequently inhibition of wnt signaling | (98) |
| miR-612 | 89 melanoma tissues and paired ANTs, nude mice (A375 cell line was injected to mice) | SK-MEL-28, SK-MEL-3, A375, HT-144, Hs294T, HEM, HEK293T | Yes | Espin | – | melanoma thickness, lymph node metastasis, poor survival | Its overexpression inhibits melanoma growth, migration and invasion through downregulation of Espin also sensitizes melanoma cells to doxorubicin | (99) |
| miR-7-5p | 20 male NOD.CB17-Prkdcscid Il2rgtm1Wjl/SzJ (NSG) mice (1205Lu cell line was injected to mice) | WM266-4, SK-MEL-2, A2058, 1205Lu | Yes | RelA | NF-κB signaling pathway | – | Inhibits cell proliferation, migration and invasion in melanoma via inhibiting RelA and reducing activity of NF-κB signaling | (100) |
| miR-7-5p | – | WM266-4, A375, A2058 | Yes | IRS-2 | Akt signaling pathway | – | Inhibits migration and invasion of melanoma cells through targeting IRS-2 and inhibition of Akt signaling | (101) |
| miR-7 | BALB/c nude mice (A375 cell line was injected to mice) | A375, Mel-CV | Yes | EGFR, IGF-1R, CRAF | MAPK and PI3K/AKT signaling pathways | – | Its upregulation reverses BRAF inhibitor resistance in melanoma cells through inhibition of MAPK and PI3K/AKT signaling pathways | (102) |
| miR-153-3p | 20 melanoma tissues and matched ANTs | A375, SK-MEL-28, D78 | Yes | SNAI1 | – | – | Its overexpression represses proliferation and invasion and induces apoptosis by downregulating SNAI1 | (103) |
| miR-625 | 30 melanoma tissues and paired ANTs, SPF grade male BALB/c nude mice (A375 cell line was injected to mice) | A375, M14 | Yes | SOX2 | – | – | Inhibits proliferation, migration and invasion of melanoma cells by targeting SOX2 | (104) |
| miR-23a | 30 specific-pathogen‐free (SPF) closed colony male ICR mice (B16 cell line was injected to mice) | B16 | Yes | SDCBP | MAPK/ERK Signaling Pathway | – | Its overexpression decreases proliferation, migration and invasion and induces cell cycle arrest at G1 phase and apoptosis in melanoma cells via suppression of SDCBP expression and regulation of MAPK/ERK Signaling | (105) |
| miR-23a | Serum samples from 192 melanoma cases and 51 matched cancer-free controls, tissue specimens from 66 melanoma cases and 22 nevus cases, female BALB/C-Nu nude mice (A2058 cell line was injected to mice) | WM35, WM793, 451LU, A2058, A375 | Yes | ATG12 | AMPK-RhoA pathway | Patient survival, tumor thickness, ulceration, AJCC stage | Decreases migration and invasion in melanoma cells through targeting ATG12 and regulation of autophagy | (106) |
| miR-23b | 114 primary melanoma tissues and ANTs, Nude mice (A375 and SK-MEL-28 cell lines were injected to mice) | A375, Hs294t, SK-MEL-5, SK-MEL-28, B16F10, nHEM | Yes | NAMPT | NF-κB signaling pathway | Patient survival, Clark level, sentinel-lymph-node positive, AJCC stage | Suppresses cell proliferation and angiogenesis and promotes apoptosis through targeting NAMPT | (107) |
| miR-23a-3p | 117 mucosal melanoma and 12 mucosal nevi, female NOD/SCID mice (HMVII cell line was injected to mice) | GAK, VMRC-MELG, HMVII, HEK293T | Yes | ADCY1 | cAMP and MAPK signaling pathways | TNM stage, poor overall survival and disease free survival | Inhibits proliferation, migration and invasion of mucosal melanoma cells through targeting ADCY1 and inhibition of cAMP and MAPK signaling pathways | (108) |
| miR-15a | 24 C57BL/6 mice (B16-F10 cell line was injected to mice) | A375, SK-MEL-28, WM1552C, B16-F10 | Yes | CDCA4, AKT3 | – | – | Inhibits cell proliferation, migration and invasion and contributes to cell cycle arrest at G1/G0 phase through targeting CDCA4 | (109) |
| miR-15a | 52 cutaneous melanoma tissues, 41 uveal melanoma tissues and 35 normal skin specimens | G361, GR-M, OCM-1 | Yes | IL-10Rα | – | – | Its ectopic expression decreases proliferation of all melanoma cell lines through targeting IL-10Rα | (95) |
| miR-143-3p | 30 formalin fixed paraffin-embedded (FFPE) primary melanoma lesions and lymph node | NHEM, Sk-Mel-28, A375, WM983A, WM1862 | Yes | COX-2 | – | – | Represses cell proliferation, migration and invasion and induces apoptosis through targeting COX-2 | (110) |
| miR-143 | – | NHEM, WM115, SK-Mel-28, A2058 | Yes | – | – | – | Its overexpression inhibits cell proliferation and induces apoptosis in melanoma cells | (111) |
| miR-708 | 60 C57BL/6J male mice (B16 cell line was injected to mice) | B16, B16F10, HEK293 | Yes | BAMBI | Wnt Signaling Pathway, TGF-β Signaling Pathway | – | Its overexpression decreases proliferation, migration and invasion and induces apoptosis in melanoma cells through targeting BAMBI and activation of TGF-β Pathway and suppression of Wnt pathway | (112) |
| miR-708 | 40 clean male Kunming mice (B16 cell line was injected to mice) | B16, A375, WM239, WM451 | Yes | LEF1 | Wnt signaling pathway | – | Its overexpression expression inhibits proliferation, migration and invasion and induces apoptosis in melanoma cell through targeting LEF1 | (113) |
| miR-216b | 30 melanoma tissues and ANTs, NOD-SCID mice (A375 cell line was injected to mice) | HEK-293T, A375, A875, SK-MEL-1, HaCaT | Yes | FOXM1 | FOXM1 signaling pathway | – | Decreases proliferation, migration and colony formation ability of melanoma cells by targeting FOXM1 | (114) |
| miR-216a-5p | 86 uveal melanoma tissues, nude mice (A375 cell line was injected to mice) | HEK293T, A375, MUM-2B, | Yes | HK2 | – | Patient survival | Suppresses proliferation and dampens glycolysis in melanoma cell via targeting HK2 | (115) |
| miR-150-5p | nude mice (A375 cell line was injected to mice) | A375, SK-MEL-2, HEK293T | Yes | SIX1 | – | – | Inhibits proliferation, migration and invasion of melanoma cells through SIX1-mediated regulation of glycolysis | (116) |
| miR-150 | 51 melanoma tissues and paired ANTs, BALB/c nude mice (A375 cell line was injected to mice) | MeWo, MHEM, A375, WM-115, WM35, PEM | Yes | MYB | – | Patient prognosis | Represses proliferation, migration and invasion of melanoma cells by inhibition of MYB | (117) |
| miR-150-5p | 52 serum samples from stage III and 40 serum samples from stage IV patients, 76 stage III and 10 stage IV FFPE tissue samples | – | No | – | – | Patient survival, | A potential prognostic biomarker | (118) |
| miR-142-3p | 52 serum samples from stage III and 40 serum samples from stage IV patients, 76 stage III and 10 stage IV FFPE tissue samples | – | No | – | – | Patient survival, disease stage | A potential prognostic biomarker | (118) |
| miR-142-5p | 52 serum samples from stage III and 40 serum samples from stage IV patients, 76 stage III and 10 stage IV FFPE tissue samples | – | No | – | – | Patient survival, disease stage | A potential prognostic biomarker | (118) |
| miR-136 | 40 male Kunming mice (B16 cell line was injected to mice) | B16, A375, WM239, WM451 | Yes | PMEL | Wnt signaling pathway | – | Its overexpression suppresses proliferation, migration, invasion and EMT process and induces apoptosis in melanoma cells by targeting PMEL and inhibition of Wnt signaling pathway | (119) |
| miR-214 | RNA‐seq data of 342 melanoma tumors were downloaded from TCGA | MRA2, MRA4, MRA5, MRA6, MRA9 | Yes | ANKRD6, CTBP1 | – | – | Its overexpression enhances malignant properties of melanoma cells and induces drug resistance in these cells through targeting negative regulators of Wnt signaling. | (120) |
| miR-125b | 48 primary melanoma tissues, 36 lymph nodes metastases and 12 neoplastic skin samples, Female athymic BALB/c nude mice (Mel lm cell line was injected to mice) | NHEM, Mel Im, Mel Ju, Mel Ho, A375 | Yes | ITGA9 | – | – | Inhibits proliferation, invasion and EMT process in melanoma cells by targeting ITGA9 | (121) |
| miR-125b | 68 primary malignant melanoma tissues and 49 lymph node metastases | NHEM, Mel Im, Mel Ju, Melanoma Ho, A375 | Yes | MLK3 | c-Jun signaling pathway | – | Its overexpression reduces proliferation and invasion of melanoma cell by targeting MLK3/JNK pathway | (122) |
| miR-125b | 5 primary melanoma tissues and 5 melanoma metastases | Mel Juso, Mel Im, Mel Ju, A375, 1205 Lu, HMB2, NHEM | Yes | c-Jun | – | – | Its upregulation reduces proliferation and migration in melanoma cell by targeting c-Jun | (123) |
| miR-125b | – | IGR, SK-Mel28, SK-Mel25, SK-Mel5, MelJuso, SM, MeWo | Yes | VDR | vitamin D signaling | – | Influences VDR expression and resistance of melanoma cell lines to 1,25(OH) (2)D (3) | (124) |
| miR-125b | 65 primary melanoma tissues and 67 melanoma metastases | A375, SKMEL-147, 451 Lu | No | – | – | Patient survival, Breslow thickness, ulceration, Mitosis/mm2, growth phase, | Can be a potential prognostic biomarker | (125) |
| miR-596 | FFPE tissues specimens of 36 melanomas and 22 nevi | A375, SK-Mel-19, A2058, Malme-3M, SK-Mel-12, SK-Mel-2, Malme-3 | Yes | MEK1, MCL1, BCL2L1 | MAPK/ERK signaling pathway | Poor overall survival | Its overexpression reduces proliferation, migration and invasion and stimulates apoptosis through targeting MEK1, MCL1 and BCL2L1 and regulation of MAPK/ERK and apoptotic pathways | (126) |
| miR‐137 | – | A2058, WM793B, HEMa‐LP, HEK‐293T | Yes | FGF9 | – | – | Its enforced expression by Propofol decreases proliferation, migration and invasion in melanoma cells through inhibition of FGF9 expression | (127) |
| miRNA-29c | 30 malignant melanoma tissues and 10 paracancer tissues | A375, SK-MEL-1, SK-MEL-5, HEMa-LP | Yes | CDK6 | – | Poor prognosis, TNM stage | Reduces cell proliferation and induces cell cycle arrest at G1 phase through suppressing expression of CDK6 | (128) |
| miR-488-5p | primary melanoma tumors, melanoma metastases, normal skin and nevi | Mel Im, 501mel, NHEM | Yes | DIXDC1 | Wnt/β-catenin signaling pathway | – | Has a tumor suppressive role. Its overexpression represses proliferation and migration and induces apoptosis in melanoma cells | (129) |
| miR-488-3p | 20 malignant melanoma tissues and ANTs, 12 male Nu/Nu mice | A375, B16, SK-MEL-28, WM451, HEMn-LP | Yes | PRKDC | – | – | Its ectopic expression sensitizes melanoma cells to cisplatin via targeting PRKDC | (130) |
| miR-675 | 21 melanoma tissues and ANTs | A375, A2058, HT144, SK-MEL-28, HEM | Yes | MTDH | – | – | Has a tumor suppressive role. Its overexpression inhibits proliferation and invasion in melanoma cells partly by targeting MTDH | (131) |
| miR-622 | Primary tumor and metastatic tumor tissue, male athymic nu/nu mice (Mel Im cell line was injected to mice) | Mel Juso, Mel Ei, Htz19, Mel Im, NHEM | Yes | KRAS | – | Patient survival | Its re-expression suppresses proliferation, migration and clonogenicity in melanoma cells. | (132) |
| miR-92 | Female C57Bl/6 mice (B16-F10 cell line was injected to mice) | B16-F10 | Yes | integrin αV and α5 | TGFβ signaling pathway | – | Implicates in integrin activation of TGFβ in melanoma cancer stem cells that gives rise to immunosuppressive tumor microenvironment and increased tumorigenesis | (133) |
| miR-4487 | 86 melanoma samples, serum samples from 130 normal controls and 255 melanoma cases | – | No | – | – | Diseases stage, survival | A probable diagnostic biomarker | ( |
| miR-4706 | – | No | – | – | Diseases stage, survival | ( | ||
| miR-4731 | – | No | – | – | Diseases stage | ( | ||
| miR-509-3p | – | No | – | – | Diseases stage | ( | ||
| miR-509-5p | – | No | – | – | Diseases stage | ( | ||
| miR-203 | – | KMeC, LMeC, CMeC-1, A2058, Mewo, HEM | Yes | CREB | – | – | Inhibits melanoma growth and melanosome transport regulating CREB/MITF/RAB27a pathway | (134) |
| miR-203 | 8 primary melanoma tissues, 11 metastases and 5 normal skin tissues | A375, A2058, SKMEL13, HT144, SKMEL5 | Yes | BMI1 | – | Tumor metastasis | Represses melanoma cells invasion and tumor sphere formation by targeting BMI1 | (135) |
| miR-203 | 148 melanoma tissues and paired ANTs | – | No | – | – | Overall survival, tumor thickness, tumor stage | Can be a potential prognostic factor and a new therapeutic target for the treatment of melanoma | (136) |
| miR-203 | – | A2058, Mewo, HEMa-LP | Yes | kif5b | – | – | Its exogenous expression suppresses melanoma cells growth and regulates melanosomes transport and tyrosinase expression through targeting kif5b | (137) |
| miR-203 | – | Mewo, A2058, HEM | Yes | E2F3a, E2F3b, ZBP-89 | – | – | Induces cell cycle arrest and senescence in melanoma cells via targeting E2F3 | (138) |
| miR-203 | 24 melanoma tissues and paired ANTs | A375, HaCaT, | Yes | versican | – | – | Inhibits migration of melanoma cells through targeting versican | (139) |
| miR-17-3p | 28 uveal melanoma tissues and 12 control samples, 30 male BALB/c nude mice (OCM-1A cell line was injected to mice) | OCM-1A, MUM-2C, C918, MUM-2B, UMs | Yes | PVT1, MDM2 | p53 signaling pathway | – | Its overexpression inhibits proliferation, migration and invasion and promotes apoptosis through PVT1/miR-17-3p/MDM2 axis | (140) |
| miR-137 | 30 primary melanoma tissues and paired ANTs | A375, SK-MEL-1, SK-MEL-5, HEMa-LP, HEMn-LP | Yes | GLS | – | Poor survival, TMN stage | Has a tumor suppressive role. It inhibits proliferation and glutamine catabolism in melanoma cells via targeting glutaminase | (141) |
| miR-137 | – | M17, M23, SP6.5, um95, HEK-293 | Yes | MITF, CDK6 | – | – | Its ectopic expression inhibits uveal melanoma cells proliferation and induces cell cycle arrest at G1 phase through downregulation of MITF and CDK6 | (142) |
| miR-137 | – | Ma-Mel-79b, Ma-Mel-86b | Yes | GLO1 | – | – | Its overexpression suppresses proliferation of melanoma cells by targeting GLO1 | (143) |
| miR-137 | miR-137 expression data of 450 melanoma patients was obtained from TCGA | WM1650, ME1402, MM200, WM1158 | Yes | TBX3 | – | Patient survival | Inhibits melanoma cell migration and anchorage independent growth by targeting TBX3 | (144) |
| miR-137 | 30 melanoma tissues and 10 normal skin tissues, BALB/c female mice (A375 cell line was injected to mice) | A2058, A375, A875, SKMEL5, TE353-SK, Hacat | Yes | AURKA | – | – | Decreases proliferation and colony formation ability of melanoma cells through targeting AURKA | (145) |
| miR-137 | 97 melanoma tissues and paired ANTs | – | No | – | – | Patient survival, TNM stage, ulcer, occurrence site | Its low expression is associated with poor prognosis in melanoma patients. | (146) |
| miR-137 | – | Ma-Mel-12, MaMel-20, Ma-Mel-37b, Ma-Mel-57, Ma-Mel-73a, Ma-Mel-79b, MaMel-86b, SK-Mel-2, SK-Mel5 | Yes | PAK2 | – | – | Suppresses proliferation of melanoma cells via inhibiting PAK2 | (147) |
| miR-137 | – | WM278, A375, HEK293 | Yes | CtBP1 | – | – | Suppresses EMT process and induces apoptosis in melanoma cells through targeting CtBP1 | (148) |
| miR-137 | – | melanoma cell lines established from metastasis of 33 patients with stage III or IV melanoma | Yes | c-Met, YB1, EZH2, MITF | – | Patient survival | Inhibits cell proliferation, migration and invasion and induces apoptosis in melanoma cells via targeting c-Met, YB1, EZH2 and MITF | (149) |
| miR-137 | 15 melanoma tissues and 15 normal pigmented nevus samples | HaCaT, SK‐MEL‐1, A375, WM451 | Yes | PIK3R3 | – | – | Represses migration and invasion of melanoma cells via targeting PIK3R3 | (150) |
| miR−30a−5p | 22 malignant melanoma tissues and ANTs, BALB/c nude mice (A375 cell line was injected to mice) | A375, SK-HEP-1, SK-MEL-1, MV3, HPM | Yes | SOX4 | – | – | Inhibits melanoma cells proliferation, migration and invasion via targeting SOX4 | (151) |
| miR-218 | 10 primary melanoma tissues, 10 lymph node metastases and 10 benign nevi samples | A375, SK-MEL-2 | Yes | CIP2A, BMI1 | Inhibits proliferation, migration and invasion in melanoma cells by targeting CIP2A, BMI1 | (152) | ||
| miR-605 | male BALB/c nude mice (Mel-RM and SK-Mel-28 were injected to mice) | HEMn-MP, SK-MEL-31, ME4405, WM1321, Me1007, Mel-RM, SK-MEL-2, SK-MEL-103, WM1366, Mel-RMU, WM278, A375, MM200, SK-Mel-28 | Yes | INPP4B | – | – | Inhibits proliferation and growth of melanoma cells through suppression of INPP4B and consequently INPP4B-mediated negative regulation of SGK3 | (153) |
| miR-24−1−5p | 77 malignant melanoma tissues and paired ANTs | A375 | Yes | UBD | JNK signaling pathway | Its overexpression gives rise to promotion of autophagy and apoptosis in melanoma cells via targeting UBD and activation of JNK signaling pathway | (154) | |
| miR-205-5p | 6 melanoma tissues and 6 skin nevus samples | HaCaT, A431, A375, A2058 and SK-MEL-2 | Yes | TNFAIP8 | – | – | Enhances apoptosis rate and sensitizes melanoma cells to vemurafenib through targeting TNFAIP8 | (155) |
| miR-205-5p | 32 primary cutaneous melanoma tissues and 8 metastatic samples | – | No | – | – | Distant metastasis | Can be a potential biomarker of distant metastases | (156) |
| miR-145-5p miR-203-3p | 32 primary cutaneous melanoma tissues and 8 metastatic samples | – | No | – | – | Breslow thickness, high Clark level, ulceration, mitotic rate | Can be potential markers of aggressiveness in melanoma | (156) |
| miR-205 | 10 primary melanoma tissues, 10 metastatic melanoma tissues and 10 benign nevi samples, 16 male athymic nu/nu mice (WM115A cell line was injected to mice) | WM35, WM793, WM115A, 1205Lu, 293T | Yes | – | – | – | Its enforced expression reduces migration, motility and proliferation of melanoma cells | (157) |
| miR-205 | 20 primary melanoma tissues, 27 metastatic melanoma tissues and 20 benign nevi | WM3211, DO4, WM278, 1205-Lu, C8161.9, Normal human melanocytes | Yes | E2F1, E2F5 | AKT signaling pathway | – | Its overexpression suppresses proliferation and colony formation and induces apoptosis in melanoma cell via targeting E2F1 | ( |
| miR-205 | 65 primary melanoma tissues and 67 melanoma metastases | A375, SKMEL-147, 451 Lu | No | ZEB1 | – | Patient survival, Breslow thickness, ulceration, Mitosis/mm2, growth phase, Histological type | Influences invasive ability of melanoma cells and can be a potential prognostic biomarker | (125) |
| miR-205 | 5 high-invasive uveal melanoma tissues, 5 low-invasive uveal melanoma tissues and 5 healthy controls | OCM-1A, C918, 293T | Yes | NRP1 | – | – | Its overexpression represses proliferation and invasion of melanoma cells via targeting NRP1 | (158) |
| miR-145-5p | 83 melanoma samples and paired ANTs, 30 male BALB/c nude mice (CHL‐1, WMM917, or SK‐mel‐28 cell lines were injected to mice) | HEK293T, SK‐mel‐28, CHL‐1, VMM917, NHEM | Yes | NRAS | MAPK and PI3K/AKT signaling pathways | Tumor thickness, NRAS mutation, tumor stage | Its high expression inhibit proliferation, migration and invasion and promotes apoptosis in VMM917 and CHL-1 melanoma cells through targeting NRAS | (159) |
| miR-145-5p | 55 melanoma samples and paired ANTs, 10 female athymic BALB/c nude mice (A375 cell line was injected to mice) | A375, WM35, VMM5A, M14, A875, HMCB, 293T | Yes | TLR4 | NF-κB signaling pathway | – | Suppresses proliferation, migration and invasion of melanoma cell via targeting TLR4 | (160) |
| miR-145-5p | 12 uveal melanoma tissues and 12 normal uveal tissues | OCM-1, MUM- 2B | Yes | N-RAS, VEGF | – | – | Inhibits tumor growth, angiogenesis and invasion of uveal melanoma cells through targeting N-RAS and VEGF | (161) |
| miR-195 | 341 matched mRNA-Seq and miRNA-Seq tumor samples, along with one normal sample for each data set were obtained from TCGA | SK-MEL-5, SK-MEL-19, SK-MEL-37, SK-MEL-147, UACC-62, WM35, WM793B, WM1366, WM1552C, WM1617, Lox10, MZ2Mel, HaCat, NGM | Yes | PHB1 | – | – | Its upregulation results in decreased cell proliferation and high cytotoxic effects of cisplatin and temozolomide on melanoma cells | (162) |
| miR-211 | Male BALB/c nude mice (SK-MEL-28 cell line was injected) | A375, SK-MEL-28 | Yes | – | – | Poor prognosis, tumor thickness, AJCC stage | Its upregulation sensitizes melanoma cells to cisplatin and increases cisplatin anticancer effect | (163) |
| miR-211 | – | A375, WM1552C, HEM-l | Yes | PDK4 | – | – | Acts as a metabolic switch and sensitizes melanoma cells to hypoxia through targeting PDK4 | (164) |
| miR-211 | 6 primary melanoma tissues and 24 melanoma metastases | HEM-l, A375, G361, LOX-IMV1, HT-144, RPMI-7951, SK-MEL2, SK-MEL28, WM793B, WM1552C, | Yes | KCNMA1 | – | – | Its overexpression reduces growth and invasion of melanoma cells via targeting KCNMA1 | (165) |
| miR-211 | – | HM, WM115, A375, SK-MEL-1 | Yes | RAB22A | – | – | Regulates EMT process through targeting RAB22A | (166) |
| miR-211 | – | HMV-I, HMV-II, G-361, SK-MEL-28, NHEM-L, NHEM-M, NHEM-D, MM-EP, MM-RU, MM-WK, HEK-293 | Yes | PRAME | – | – | Regulates PRAME expression in melanoma cells its overexpression cause reduction in PRAME expression | (167) |
| miR-211 | – | 61 melanoma cell lines (some of them include: A2–A15, D4–D25, ME1007, ME1402, ME4405, ME10538, Mel-FH, Mel-RM, Mel-RMU, MM470, MM537, MM629) | Yes | BRN2 | – | – | Changes invasion capacity of melanoma cells through targeting BRN2 | (168) |
| miR-211 | miRNA expression was derived for eleven melanoma cell lines and matched to samples obtained from GEO | WM3526, WM3682, 451LU | Yes | NUAK1 | – | – | Its upregulation inhibits invasion and restores adhesion through targeting NUAK1 | (169) |
| miR-211 | 52 cutaneous melanoma tissues, 41 uveal melanoma tissues and 35 normal skin specimens | G361, GR-M, OCM-1 | Yes | IL-10Rα | – | – | Its ectopic expression decreases proliferation of all melanoma cell lines through targeting IL-10Rα | (95) |
| miR-211 | – | A375M, UACC62, HeLa | Yes | IGF2R, TGFBR2, NFAT5 | – | – | Its overexpression inhibits migration and invasion of invasive melanoma cells | (170) |
| miR-181a | 10 melanoma tissues and paired ANTs | WM266-4, A2058 | Yes | Bcl-2 | – | – | Is upregulated by Piceatannol treatment and contributes to anticancer role of piceatannol through targeting Bcl-2 | (171) |
| miR-181 | 17 matched melanoma tissues before and after resistance of patients to BRAF inhibitors | A375, M14 | Yes | TFAM | – | Patient survival | Its overexpression impedes melanoma growth and alleviates resistance to dabrafenib through targeting TFAM | (172) |
| miR-375 | 24 melanoma tissues, normal skin and nevi samples | HEM‐l, HEK, WM793B, WM278, WM1552C | Yes | – | – | – | Its ectopic expression suppresses proliferation invasion, and cell motility and induces changes in cell shape in melanoma cells | (173) |
| miR-328 | – | HEM, SK-MEL-1, A375 | Yes | TGFB2 | – | – | Its overexpression represses proliferation and induces cell cycle arrest at G1 phase | (174) |
| miR-4633-5p | 56 Primary human sinonasal mucosal melanoma tissues | A375, M435S | Yes | – | Akt pathway | Metastasis | Inhibits cell growth, invasion and secretion of MMP2 in melanoma | (175) |
| miR-455 | 20 melanoma tissues and paired ANTs | SKMEL1, A375, HT144, A2058, HEK293T | Yes | IGF−1R | – | – | Suppresses proliferation and invasion in melanoma cells via targeting IGF1R | (176) |
| miR-145 | 5 high-invasive uveal melanoma tissues, 5 low-invasive uveal melanoma tissues and 5 healthy controls | OCM-1A, C918, 293T | Yes | NRP1 | – | – | Represses proliferation and invasion of melanoma cells via targeting NRP1 | (158) |
| miR-145 | 33 oral canine malignant melanoma tissues and 11 canine normal oral mucosa tissues, | KMeC, LMeC, CMeC-1, CMeC-2, A2058, Mewo, HEM | Yes | c-MYC, FASCIN1 | – | – | Inhibits proliferation and migration in melanoma cells through suppression of c-MYC and FASCIN1 | (177) |
| miR-145 | 11 uveal melanoma tissues and 12 normal controls | MUM-2B, OCM-1 | Yes | IRS-1 | – | – | Inhibits cell proliferation through blocking G1/S transition and induces apoptosis in uveal melanoma cells via targeting IRS-1 | (178) |
| miR-145 | – | BLM, FM3P, WM793 | Yes | – | – | – | Its overexpression inhibits migration and invasion in metastatic melanoma cells | (179) |
| miR-219-5p | 42 melanoma tissues and 20 nevi tissues, 6 nude mice (A375 cell line was injected to mice) | A375, WM35, SK-MEL-5, SK-MEL-2, HEMa-LP | Yes | Bcl-2 | Overall survival, TNM stage, distant metastasis | Reduces proliferation, migration and invasion and promotes apoptosis in melanoma cells by targeting Bcl-2 | (180) | |
| miR-31 | 9 primary melanoma tissues, 71 metastatic melanoma and 2 dysplastic nevi | SK-Mel5, SK-Mel28, MM603 | Yes | SRC, MET, NIK, RAB27a | – | – | Has tumor suppressive role and its ectopic expression inhibits migration and invasion in melanoma cells | (181) |
| miR-31 | Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice) | C8161 (HAG), C81-61 (PAG) | Yes | – | – | – | Suppresses proliferation, invasion and tube formation in melanoma cells | (93) |
| miR-124a | 6 primary uveal melanoma and paired ANTs, Female nude mice (M23 and SP6.5 cell lines were injected to mice) | M17, M21, M23, SP6.5, HEK-293, um95 | Yes | CDK4, CDK6, cyclin D2, EZH2 | – | – | Has a tumor suppressive role and represses proliferation, migration and invasion in uveal melanoma cells | (182) |
| miR-124 | 107 melanoma tissues and paired ANTs | HEM, SK-MEL-1, A375 | Yes | RLIP76 | – | TNM stage | Suppresses melanoma cells proliferation and invasion and induces apoptosis by targeting RLIP76 | (183) |
| miR-124 | 68 melanoma tissues and paired ANTs | B16, A375, HACAT | Yes | Versican | – | Tumor thickness, clinical stage, lymph node involvement | Inhibits proliferation, migration and invasion of melanoma cells through targeting Versican | (184) |
| miR-206 | serum samples from 60 melanoma patients and 30 healthy controls | – | No | – | – | Poor prognosis, response to treatment, clinical stage | May be implicated in melanoma progression an can be a potential prognostic factor | (185) |
| miR-206 | 36 melanoma tissues and 16 Healthy control tissues | A375, MALME-3M, RPMI7951, SKMEL-2, SK-MEL-5, NHEM-Ad-Adult | Yes | CDK4, Cyclin D1, Cyclin C | – | – | Reduces proliferation, migration and invasion and induces cell cycle arrest at G1 phase in melanoma cells | (186) |
| miR-186 | – | SK-MEL-1, G-361, A375, A875, HEMn-LP | Yes | – | – | – | Inhibits proliferation, migration and invasion in melanoma cells | (187) |
| miR-26b | 59 melanoma tissues and ANTs | HEK293, B16F10, B16F0, A375, HMCB, Hs695T | Yes | TRAF5 | MAPK pathway | – | Reduces cell growth and induces apoptosis in melanoma cells by targeting TRAF5 | (188) |
| miR-196a | 3 primary melanoma tissues and 5 melanoma metastases | Mel Ei, Mel Wei, Mel Juso, Mel Im, Mel Ju, HMB2, SkMel 3, SkMel 28, NHEM | Yes | HOX-C8 | – | – | Decreases invasion in melanoma cells through suppression of HOX-C8 expression | (189) |
| miR-196a | – | Mel Ei, Mel Wei, Mel Ho, Mel Juso, Mel Ju, SkMel 28, SkMel 3, NHEM | Yes | HOX-B7 | – | – | Regulates migration of melanoma cells through influencing miR-196a/HOX-B7/Ets-1/bFGF/BMP4 axis | (190) |
| miR-193b | FFPE specimens of 8 benign nevi, and 8 metastatic melanomas | Malme-3M, SKMEL-28, SKMEL-5 | Yes | CCND1 | – | – | Suppresses proliferation and cell cycle arrest at G1 phase in melanoma cells through downregulation of CCND1 | (191) |
| miR-193b | FFPE tissue specimens of 8 benign nevi, 8 metastatic melanoma and 15 primary melanoma tissues | Malme-3M, MeWo, SK-MEL-2, SK-MEL-28 | Yes | Mcl-1 | – | – | Sensitizes melanoma cells to ABT-737 and regulates expression of Mcl-1 | (192) |
| miR-200c | 10 primary melanoma tissues, 10 metastatic melanomas and 10 benign nevi samples, male athymic nu/nu mice (WM115A cell line was injected to mice) | WM35, WM793, WM115A, WM3523A, 1205Lu, 293T | Yes | BMI-1 | – | – | Inhibits proliferation, migration and metastasis of melanoma cells via suppression of BMI-1 expression | (193) |
| miR-200c | 65 primary melanoma tissues and 67 melanoma metastases | A375, SKMEL-147, 451 Lu | No | – | – | Patient survival, Breslow thickness, ulceration, Mitosis/mm2, growth phase, location, histological type | Can be potential prognostic biomarker | (125) |
| miR-200a | Paraffin-embedded archival tissue specimens of 7 primary melanoma, 33 lymph node metastasis, 25 distant organ metastasis and 10 benign nevi | MELANO, MEL 2183, COLO 829 | Yes | CDK6 | – | – | Inhibits proliferation and induces cell cycle arrest in melanoma cells through targeting CDK6 | (194) |
| miR-200a | 46 melanoma tissues and paired ANTs | A375, SK-HEP-1, WM35, SK-MEL-28 | Yes | GOLM1 | PI3K/Akt signaling pathway | Overall survival, tumor thickness, TNM stage | Inhibits proliferation, migration and invasion of melanoma cells via targeting GOLM1 and regulation of PI3K/Akt signaling pathway | (195) |
| miR-155 | 25 uveal melanoma tissues and ANTs | OCM-1A, MUM-2C, C918, MUM-2B, D78 | Yes | NDFIP1 | – | – | Enhances proliferation and invasion of uveal melanoma cells via targeting | (196) |
| miR-155 | – | SK-Mel-28, WM-266-4, GL-Me, 397-Mel, CH-Mel, DR-Mel, SN-Mel, | Yes | SKI | – | – | Inhibits melanoma cells proliferation through targeting SKI | (197) |
| miR-155 | – | CG-Mel, CH-Mel, CL-Mel, CN-Mel, CR-Mel, CT-Mel, DR-Mel, GL-Mel, GR-Mel, MR-Mel, M14, PNM-Mel, PNP-Mel, SK-Mel-28, SN-Mel, WM-266-4, 397-Mel, normal melanocytes | Yes | – | – | – | Its ectopic expression represses proliferation and induces apoptosis in melanoma cells | ( |
| miR-155 | 60 melanoma tissues and paired ANTs | A375, SKMEL-28, A2058, HEM | Yes | CBL | – | tumor thickness, TNM stage, lymph node metastasis | Suppresses proliferation, migration and invasion of melanoma cells via targeting CBL | (198) |
| miR-18b | 92 primary melanoma tissues and 48 benign nevi samples, 20 nude mice (1205-Lu cell line was injected to mice) | 1205-Lu, DO4, WM3211, WM278 | Yes | MDM2 | p53 signaling pathway | Overall survival | Reduces proliferation, migration and invasion and induces apoptosis in melanoma cell through downregulation of MDM2 | (199) |
| miR-18b | 68 melanoma tissues and paired ANTs, 6 male BALB/C-nu/nu nude mice (B16 cell line was injected to mice) | HEK293 cells, MM B16, A375, HACAT | Yes | HIF-1α | – | tumor thickness, tumor stage | Inhibits glycolysis and cell proliferation and induces cell cycles arrest in melanoma cells through targeting HIF-1α | (200) |
| miR-26a | – | SK-MEL-28, HT-144, HEK293, HEMNLP, HEMNLP2, WM278, WM852c, 1205Lu, A375, RPMI7951 | Yes | SODD | – | – | Decreases cell viability and induces apoptosis in melanoma cells through targeting SODD. | (201) |
| miR-26a | – | A2058, A375, SK-MEL-5, SK-MEL-28 | Yes | Lin28B, Zcchc11 | – | – | Increases microRNA synthesis by targeting Lin28B and Zcchc11 to inhibit tumor growth and metastasis | (202) |
| miR-26a | male C57BL/6 mice (B16-F10 cell line was injected to mice) | WM1552C, SKMEL-28, B16-F10 | Yes | MITF | – | – | Inhibits proliferation and invasion of melanoma cells via targeting MITF | (203) |
| miR-9 | 10 primary melanoma tissues and 10 metastases | WM35, WM793, WM115A, 1205Lu, 293T | Yes | NF-κB1 | NF-κB1-Snail1 signaling pathway | – | Reduces proliferation and migration of melanoma cells through regulation of NF-κB1-Snail1 pathway. | (204) |
| miR-9 | 24 melanoma tissues and 14 benign nevi samples | WM852, WM1791C, WM8, FO-1, WM983A, WM793, Daju, WM209 | Yes | RYBP | – | – | Suppresses proliferation migration and invasion in melanoma cells through targeting RYBP | (205) |
| miR-9 | – | MUM-2B, C918, MUM-2C, OCM-1A | Yes | NF-κB1 | NF-κB1 signaling pathway | – | Suppresses migration and invasion of uveal melanoma cells via targeting cells NF-κB1 and downregulation of the NF-κB1 signaling pathway | (206) |
| miR-9 | 73 melanoma tissues and paired ANTs, Male BALB/C-nu/nu nude mice (A375 cell line was injected to mice) | HACAT, G361, B16, A375, HME1 | Yes | NRP1 | – | tumor stage, lymph node metastasis | Decreases melanoma cells proliferation, migration and invasion of through targeting NRP1. | (207) |
| miR-9 | 24 primary melanoma tissues and paired ANTs | B16, A375, G361, HME1, HACAT, HEK293 | Yes | SIRT1 | – | – | Inhibits proliferation and migration of melanoma cells partly through targeting SIRT1 | (208) |
| let-7b | 10 primary melanoma tissues and 10 benign melanocytic nevi | SK-Mel-147, G361 | Yes | cyclin D1, cyclin D3, cyclin A, Cdk-4 | – | – | Suppresses progression of cell cycle and anchorage-independent growth in melanoma | (85) |
| let-7b | 16 melanoma tissues and 8 normal tissues | s SK-mel-28, A375, A2058, HaCaT | Yes | UHRF1 | – | – | Suppresses proliferation of melanoma cell by targeting UHRF1 | (209) |
| let-7b | – | OCM1, OM431 | Yes | cyclin D1 | – | – | Sensitizes radioresistance uveal melanoma cells to radiotherapy by targeting cyclin D1 | (210) |
| let-7b | 106 mucosal melanoma tissues, mucosal nevi Female NOD/SCID (HMVII cell line was injected to mice) | HMVII, GAK, 293T | Yes | MTDH, CALU | – | Patient survival, ECOG score | Suppresses melanoma cells proliferation, migration, invasion and induces apoptosis through targeting MTDH and CALU | (211) |
| let-7c | 106 mucosal melanoma tissues, mucosal nevi Female NOD/SCID (HMVII cell line was injected to mice) | HMVII, GAK, 293T | Yes | MTDH, CALU | – | Patient survival, ECOG score | Suppresses melanoma cells proliferation, migration, invasion and induces apoptosis through targeting MTDH and CALU | (211) |
| let-7a | – | Mel Im, Mel Wei, Mel Juso, Mel Ei, Mel Ho, Mel Ju, HMB2, SK-Mel 28 | Yes | integrin β3 | – | – | Its overexpression decreases invasive ability of melanoma cells through downregulation of integrin β3 | (86) |
| miR-330-3p | 77 melanoma tissues and 38 Normal skin tissues, | SK-MEL-2, UACC903 | Yes | TPX2 | – | – | Suppresses proliferation of melanoma cells through negative regulation of TPX2 | (212) |
| miR-330-5p | 26 primary melanoma tissues and 26 matched non-tumor tissues | HEMn-LP, A375, A875 | Yes | TYR, PDIA3 | – | – | Represses proliferation, migration and invasion of melanoma cells via suppression of TYR and PDIA3 expression | (213) |
| miR-183 | 30 melanoma tissues and 14 normal skin samples, female BALB/c mice (SK-MEL-1 cell line was injected to mice) | A375, C32, EDMEL3, G361, HBL, WM1115, SK-MEL-1, M14, MV3, A875, M21, Hermes1, Hermes4, Hacat, TE353.SK, HEK293T | Yes | ITGB1 | ITGB1 signaling pathway | Poor prognosis, advanced pathological stage | Suppresses proliferation of melanoma cells through targeting ITGB1 | (214) |
| miR-144 | 5 uveal melanoma tissues and 5 uveal normal tissues | MUM-2B, C918, MUM-2C, OCM-1A, D78 | Yes | c-Met | – | – | Inhibit proliferation and migration in uveal melanoma cells via targeting c-Met | (215) |
| miR-144 | 26 uveal melanoma tissues and normal choroid samples | MEL270, OMM2.5, UPMM3, UPMM2 | Yes | ADAM10, c-Met | – | – | Suppresses proliferation, migration and cell cycle progression in melanoma cells through targeting ADAM10 and c-Met | (216) |
| miR-122 | 26 uveal melanoma tissues and normal choroid samples | MEL270, OMM2.5, UPMM3, UPMM2 | Yes | ADAM10, c-Met | – | – | Suppresses proliferation, migration and cell cycle progression in melanoma cells through targeting ADAM10 and c-Met | (216) |
| miR-107 | 15 primary melanoma tissues, 15 melanoma metastases and 15 nevi samples | SK-MEL-1, A375, G-361, SK0MEL-3, SH-4, SK-MEL-24 | Yes | POU3F2 | – | late stage | Decreases proliferation, migration and invasion in melanoma cells | (217) |
| miR-296-3p | 18 choroidal malignant melanoma tissues and 6 normal choroidal tissues | C918, | Yes | MMP−2, MMP−9 | – | – | Suppresses proliferation, migration and invasion and stimulates apoptosis | (218) |
| miR-542-3p | 24 melanoma tissues and 12 non-neoplastic skin tissues, C57BL/6J mice (B16F10 cell line was injected to mice) | A375, SK-MEL-19, SK-MEL-28, WM451, B16F10 | Yes | PIM1 | – | – | Inhibits migration, invasion and EMT process in melanoma cells via targeting PIM1 | (219) |
| miR-625‐5p | Primary melanoma tissues and normal tissues | A2085, A375, A875, Mel‐RM, M14, M21, WM35, HFE | Yes | PKM2 | – | TNM stage, tumor size, poor differentiation | Inhibits melanoma cells proliferation and glycolysis and sensitizes these cell to BRAF inhibitor via targeting PKM2 | (220) |
| miR-339-3p | NSG mice (A375 cell line was injected to mice) | A375, WM266.4, WM115 | Yes | MCL1 | – | – | Reduces invasive ability and metastasis in melanoma cells through targeting MCL1 | (221) |
| miR-590-5p | female athymic Balb/C nude mice (A2058 cell line was injected to mice) | A2058, A375, HEMa-LP, 293, HM | Yes | YAP1 | – | – | Reduces proliferation and induces apoptosis in melanoma cells via downregulation of YAP1 | (222) |
| miR-768-3p | – | MM200, Mel-CV, IgR3, Mel-RMu, Sk-Mel-28, Me1007, Mel-JD, Mel-FH, Me4405, Mel-RM, HEMn-MP, HEMn-DP | Yes | eIF4E | – | – | Suppresses cell proliferation and survival and reduces nascent protein synthesis in melanoma cells through targeting eIF4E | (223) |
| miR-451a.1 | 105 melanoma tissues and 101 normal skin tissues | A2058, A375P, C32, A375SM, WM983A, WM278, WM35, WM1552C | Yes | CAB39 | – | – | Inhibits migration and invasion of melanoma cells (this effect is not mediated by CAB39) | (224) |
| miR-32 | Genetically engineered mice (Mice carrying an HGF/SF transgene) (A375P cell line was injected to mice) | WM3928, A375P, YUGEN8 | Yes | MCL-1 | MAPK pathway | – | Decreases tumorigenicity and induces apoptosis in melanoma cells via targeting MCL-1 | (225) |
| miR-493 | 52 melanoma tissues and paired ANTs | PEM, SK-MEL-28, WM-115, UACC257, A375, A7, MeWo, NHEM | Yes | IRS4 | – | – | Suppresses proliferation and cell cycle progression in melanoma cells through targeting IRS4 | (226) |
| miR-382 | 211 primary melanoma tissues, NOD/Shi-scid/IL-2Rγnull (NOG, Taconic) mice (451Lu cell line was injected to mice) | 501MEL, 451Lu, WM1361a, SK-MEL-147, SK-MEL-173, SK-MEL-28 | Yes | CTTN, RAC1, ARPC2 | – | Tumor thickness, recurrence-free survival | Inhibits tumor metastasis, invasion and matrix degradation through targeting CTTN, RAC1 and ARPC2 | (227) |
| miR-516b | 211 primary melanoma tissues, NOD/Shi-scid/IL-2Rγnull (NOG, Taconic) mice (451Lu cell line was injected to mice) | 501MEL, 451Lu, WM1361a, SK-MEL-147, SK-MEL-173, SK-MEL-28 | Yes | – | – | Tumor thickness | Suppresses tumor growth and metastasis | (227) |
| miR-194 | 60 melanoma tissues and paired ANTs | A375, A875 | Yes | GEF-H1 | – | TNM stages | Inhibits proliferation and metastasis of melanoma cells through suppression of GEF-H1/RhoA pathway | (228) |
| miR-194 | 24 melanoma tissues and paired ANTs, | SK-Mel2, | Yes | – | PI3K/AKT/FoxO3a and p53/p21 signaling pathways | Patient survival | Inhibits cell proliferation and induces apoptosis through regulation of PI3K/AKT/FoxO3a and p53/p21 signaling pathways | (229) |
| miR-128 | 14 primary cutaneous melanoma tissues and ANTs | A375, | Yes | CCL18 | – | – | Inhibits migration and colony formation ability and promotes apoptosis in melanoma cells through targeting CL18 | (230) |
| miR-1280 | 37 melanoma tissues and 24 benign nevi samples | A375, Mamel66a, Mamel103b, 1205-Lu, C8161.9 | Yes | Src | – | – | Suppresses proliferation, cell cycle progression and invasion and promotes apoptosis in melanoma cells via targeting Src | (231) |
| miR-573 | 11 melanoma tissues and paired ANTs, BABL/c nude mice (A375, SK-MEL-2 cell lines were injected to mice) | A375, SK-MEL-2 | Yes | MCAM | – | – | Suppresses proliferation and invasion of melanoma cells via targeting MCAM | (232) |
| miR-33a-5p | 29 melanoma tissues and ANTs, nude mice (SKMEL-28 cell line was injected to mice) | SKMEL-28, A375, WM35, SKMEL-1, PIG1 | Yes | SNAI2 | PI3K/AKT/mTOR signaling pathway | Lymph node metastasis, tumor size, STM stage | Suppresses proliferation, migration and invasion and induces apoptosis in melanoma cell through targeting SNAI2 | (233) |
| miR-33a-5p | 20 melanoma and match nevus tissues | A375, WM35, WM451, SK-MEL-1, HM | Yes | – | – | – | Reduces proliferation and promotes radiosensitivity by suppressing glycolysis in melanoma cells | (234) |
| miR-33a | Male BALB/C-nu/nu mice (A375 cell line was injected to mice) | WM35, WM451, A375, SK-MEL-1, HM | Yes | HIF-1α | – | – | Inhibits proliferation, invasion and metastasis in melanoma cells via targeting HIF-1α | (235) |
| miR-33a | – | SK-MEL-1, WM-115, PEMI, PEM2 | Yes | PCTAIRE1 | – | – | Suppresses proliferation and colony formation ability of melanoma cells through targeting PCTAIRE1 | (236) |
| miR-33b | – | WM35, WM451, SK-MEL-1, HM, HEK293 | Yes | HIF-1α | – | – | Suppresses melanoma cells proliferation and glycolysis through targeting HIF-1α | (237) |
| miR-98 | 20 melanoma tissues and 20 normal nevi, 80 male mice (B16-F1 cell line was injected to mice) | B16-F1 | Yes | IL-6 | – | Patient survival, tumor stage | Suppresses migration and metastasis of melanoma cell through miR-98-IL-6-negative feedback loop | (238) |
| miR-425 | Melanoma tissues and normal tissues | A375, SK-MEL-28, UACC257, WM-115, NHEM | Yes | IGF-1 | PI3K-Akt signaling pathway | – | Suppresses proliferation and metastasis of melanoma cell via targeting IGF-1 and inhibition of PI3K-Akt signaling pathway | (239) |
| miR-337 | 40 melanoma tissues and paired ANTs | HEK293, A375, A875 | Yes | STAT3 | – | Patient prognosis | Suppresses growth and metastasis in melanoma cells via targeting STAT3 | (240) |
| miR-637 | 61 melanoma tissues and ANTs | A375, SK-MEL-28, Mel-RM, HaCaT | Yes | P-REX2a | PTEN/AKT signaling pathway | lymph node metastasis, TNM stage | Inhibits proliferation and G1-S transition in melanoma cells through targeting P-REX2a | (241) |
| miR-329 | 36 paraffin‐embedded melanoma tissues and 10 pigmented nevi samples | PEM, WM‐115, A375, A7, UACC257 | Yes | HMGB2 | β‐catenin signaling pathway | – | Suppresses proliferation, migration and invasion and promotes apoptosis in melanoma cell through negative regulation of HMGB2 | (242) |
| miR-579-3p | FFPE samples from 9 stage III/IV melanomas, 10 stage I/II melanomas, 4 dysplastic nevi, 10 melanocytic nevi and 4 patients before and after BRAF inhibitor treatment | M14, LOX IMVI, COLO 38, MALME-3M, SKMEL5, WM115, WM266, M229, HEK-293 | Yes | BRAF, MDM2 | – | – | Inhibits growth and migration of melanoma cells, induces apoptosis and impairs drug resistance in melanoma | (243) |
| miR-101 | – | HEK293T, NHEM, 29 melanoma cell lines established from metastases of melanoma patients | Yes | MITF, EZH2 | Patient survival | Suppresses proliferation, migration and invasion of melanoma cells through targeting MITF and EZH2 | (244) | |
| miR-664 | 9 melanoma and 2 BMN tissues, 10 Nude mice (A375 cell line was injected to mice) | A375.S2, A7, MeWo, RPMI-7951, SK-MEL-5, SK-MEL-24, SK-MEL-28, PEM | Yes | PLP2 | – | Patient survival | Decreases proliferation and tumorigenicity of melanoma cells through targeting PLP2 | (245) |
| miR-29a | – | HACAT, HFF, A375, Malme-3M, SK-MEL-2, SK-MEL-5, M14 | Yes | Bmi1 | Wnt/β-catenin and NF-κB signaling pathways | – | Suppresses cell growth, migration and invasion in melanoma cells and induces apoptosis by targeting Bmi1 | (246) |
| miR-524-5p | male NOD/SCID mice (SK-Mel-19 cell line was injected to mice) | HEK293, Malme-3M, Malme-3, A375, SK-Mel-19 | Yes | BRAF, ERK2 | MAPK/ERK signaling pathway | – | Inhibits proliferation and migration of melanoma cells through targeting BRAF and ERK2 and inhibition of MAPK/ERK signaling pathway | (247) |
| miR-138 | Whole blood samples from 5 melanoma patients and 6 healthy controls | A2058 | Yes | – | PI3K/AKT/mTOR signaling pathway | Patient survival | Suppresses cell proliferation and induces apoptosis in melanoma cells via inhibition of PI3K/AKT/mTOR signaling pathway | (248) |
| miR-138 | – | WM451, HM | Yes | HIF-1α | – | – | Inhibits melanoma cells proliferation, invasion and glycolysis through targeting HIF-1α | (249) |
| miR-138 | 16 melanoma tissues and 16 precancerous tissues, female mice (WM35 and A375 cell lines were injected to mice) | WM35, A375, HEK293 | Yes | HIF1α | – | – | Inhibits proliferation, migration and invasion and promotes apoptosis in melanoma cells through targeting HIF1α | (250) |
| miR-126 | 108 primary cutaneous melanoma tissues, 18 melanoma metastases and 16 dysplastic nevi samples | – | No | – | – | Patient survival, Breslow thickness, tumor ulceration, tumor stage | Can be an independent prognostic factor for overall survival | (251) |
| miR-126&126* | adult athymic nude mice (A375M and Me665/1 cell lines were injected to mice) | A375M, A375, Me665/1, NHEM, Me1007, Mel501, WM983A, Me1402/R, Me665/2, GR-mel, ST-mel, | Yes | ADAM9, MMP7 | – | – | Decrease proliferation, invasion and chemotaxis of melanoma cells through targeting ADAM9 and MMP7 | (252) |
| miR-377 | FFPE tissues samples of 6 primary cutaneous melanoma and 13 benign nevi | mel33B1, mel-14PA, mel-15AY, mel-526, mel-624, NHEM | Yes | E2F3, MAP3K7 | MAP3K7/NF-kB signaling pathway | – | Decreases proliferative ability and colony-forming capability in melanoma cells | (253) |
| miR-139-5p | 82 malignant melanoma tissues and 30 benign skin disease tissues from healthy controls | PIG1, A375, SK-MEL-1, SKMEL-2, SK-MEL-5, SK-MEL-28 | Yes | IGF1R | PI3K/AKT signaling pathway | – | Inhibits cell proliferation, migration and invasion and promotes apoptosis through targeting IGF1R | (254) |
| miR-342 | 27 melanoma tissues and paired ANTs | HEM, A375, A2058, SK-MEL-28, HT144 | Yes | ZEB1 | – | – | Inhibits proliferation and invasion of melanoma cells through targeting ZEB1 | (255) |
| miR-127 | 40 melanoma tissues and paired ANTs, male BALB/c nude mice (WM35 cell line was injected to mice) | WM35, SK-MEL-5, SK-MEL-2, A375, HeMa-Lp | Yes | DLK1 | – | Overall survival, tumor thickness, tumor stage | Suppresses cell proliferation and induces apoptosis through downregulation of DLK1 | (256) |
| miR-22 | 48 melanoma tissues and paired ANTs, nude mice (A375 cell line was injected to mice) | HEM, A375, SK-MEL-1, WM35, SK-MEL-28 | Yes | FMNL2 | Wnt/β-Catenin Signaling Pathway | Overall survival, tumor thickness, TNM stage | Suppresses proliferation, migration and invasion of melanoma cells through targeting FMNL2 | (257) |
| miR-3065-5p | 12 primary melanoma and 9 benign melanocytic tumors | BRO, SK-MEL1 | Yes | HIPK1, ITGA1 | – | – | Induces cell cycle arrest at G1 phases and inhibits migration of melanoma cells | (258) |
| miR-204-5p | 12 primary melanoma and 9 benign melanocytic tumors | BRO, SK-MEL1 | Yes | – | – | – | Decreases proliferation, invasion and colony formation ability of melanoma cells | (258) |
| miR-204-5p | 30 melanoma tissues and 20 benign nevi tissues, 10 immunodeficient female nude mice (A375 cell line was injected to mice) | A375, WM35, SK-MEL-5, SK-MEL-2 | Yes | MMP9, BCL2 | – | Overall survival | Inhibits proliferation, migration and invasion and induces apoptosis in melanoma cells through targeting MMP9 and BCL2 | (259) |
| miR-610 | 105 melanoma tissues and ANTs, female BALB/c mice (A375 and MV3 were injected to mice) | SK-MEL-1, A375, SK-MEL-28, MV3, B16-F1, HPM | Yes | LRP6 | – | Patient survival, tumor stage, tumor thickness | Represses cell proliferation, cell cycle progression and induces apoptosis in melanoma cells by targeting LRP6 | (260) |
| miR-3662 | 80 melanoma tissues and paired ANTs, BALB/c nude mice (A375 and OCM-1A cell lines were injected to mice) | A375, OCM-1A | Yes | ZEB1 | – | – | Inhibits invasion and EMT process in melanoma cell via targeting ZEB1 | (261) |
| miR-331 | 22 melanoma tissues and paired ANTs | HEM, A375, A2058, HT144, SK-MEL-1, SK-MEL-28 | Yes | AEG-1 | PTEN/AKT signaling pathway | – | Suppresses proliferation and invasion of melanoma cells through targeting AEG-1 | (262) |
| miR-149-5p | Melanoma tissues and ANTs | A2058, A375, HSC-1, SK-37, SKMLE-1, WM451, HaCaT | Yes | LRIG2 | – | – | Reduces proliferation, colony formation and induces apoptosis in melanoma cells through targeting LRIG2 | (263) |
| miR-338-3p | 60 melanoma tissues and paired ANTs, | A375, G361 | Yes | MACC1 | – | clinical stage, lymph node metastasis | Inhibits proliferation, migration and invasion in melanoma cells through targeting MACC1 | (264) |
| miR-4458 | – | A375, A2058, SK-MEL-28, SK-MEL-2, HEMa-LP | Yes | PBX3 | – | – | Represses proliferation, migration and induces apoptosis in melanoma cells via targeting PBX3 | (265) |
| miR-489-3p | nude mice (A375 cell line was injected to mice) | A375, SK-MEL-2 | Yes | SIX1 | – | – | Inhibits proliferation, migration and invasion of melanoma cells and regulates glycolysis through targeting SIX1 | (266) |
| miR-431 | 113 melanoma tissues and paired ANTs | A875, HBL, 1205Lu, A375, SK-MEL-1, HEMa-LP, CHL-1 | Yes | NOTCH2 | – | Overall survival, tumor stage, ulceration | Suppresses cell proliferation, migration and invasion and induces apoptosis in melanoma cells through targeting NOTCH2 | (267) |
| miR-134 | 18 melanoma tissues and paired ANTs | BT549, MB-231, MB-486, MCF7, SK-BR-3, 293T | Yes | CTHCR1 | – | – | Decreases proliferation, migration, invasion and induces cell cycle arrest and apoptosis in melanoma cells through downregulation of CTHCR1 | (268) |
| miR-224-5p | 30 uveal melanoma tissues and paired ANTs | OCM‐1A, HEK 293T | Yes | PIK3R3, AKT3 | – | – | Suppresses proliferation, migration and invasion of melanoma cells via targeting PIK3R3 and AKT3 | (269) |
| miR-140-5p | 25 melanoma tissues and paired ANTs, 20 adult athymic nude mice (SK‐MEL‐1 cell line was injected to mice) | A375, A875, SK‐MEL‐5, SK‐MEL‐1, SK‐MEL‐28, HEMa‐LP, HaCaT | Yes | SOX4 | Wnt/β‐catenin and NF‐κB signaling pathways | clinical stage | Its overexpression inhibits proliferation and invasion of melanoma cells by targeting SOX4 and inactivation of Wnt/β-catenin and NF‐κB signaling pathways | (270) |
| miR-140-3p | 25 melanoma tissues and paired ANTs, 30 male BALB/c nude mice (M229, A375 and M14 cell lines were injected to mice) | M14, MALME-3M, M229, WM226, A375, SKMEL5, LOX IMVI, HPM | Yes | ABHD2 | JNK and AKT/p70S6K Signaling Pathway | Overall survival | Blocks proliferation, migration and invasion and induces apoptosis in melanoma cell through targeting ABHD2 | (271) |
| miR-135b | 27 melanoma tissues and 27 normal skin tissues | A375, PEM | Yes | RBX1 | – | – | Suppresses proliferation, migration and invasion of melanoma cells through targeting RBX1 | (272) |
List of under-expressed miRNAs in melanoma.
Diagnostic/prognostic miRNAs in melanoma
Hanniford et al. have introduced a miRNA panel consisting of miR-150-5p, miR-15b-5p, miR-16-5p, and miR-374b-3p whose expression levels could predict the possibility of brain metastasis of melanoma tumors along with clinical stage. Moreover, Kaplan-Meier analysis showed the significance of this miRNA panel in determination of brain-metastasis-free and overall survival of patients with melanoma (273). Stark et al. have assessed expression levels of 17 miRNAs in both melanoma tissues and serum samples of these patients compared with cancer-free individuals. Expression levels of these miRNAs in melanoma samples have been shown to predict stage, recurrence, and survival of patients. Notably, serum expression of a seven-miRNA panel could distinguish melanoma patients from control subjects with 93% sensitivity and more than 82% specificity if at least 4 miRNAs were expressed. Based on the superiority of this miRNA panel above the conventional serological biomarkers for melanoma, it has been suggested as a tool for monitoring disease course in early metastatic melanoma cases to identify relapse after tumor excision or adjuvant therapy (
Table 3
| microRNA | Sample number | Kaplan-Meier analysis | Univariate cox regression | Multivariate cox regression | Reference |
|---|---|---|---|---|---|
| miR-10b | 79 primary melanoma tissues and 32 metastases | – | Is a potential prognostic biomarker associated with metastasis | Can be an independent potential prognostic factor | ( |
| miR-10b | 78 melanoma tissues and 30 non-tumor skin samples | Its high expression is associated with poor OS in melanoma patients. | – | – | ( |
| miR-10b | Blood samples from 85 melanoma patients and 30 healthy volunteers | Its high serum levels is associated with short DFS and OS. | – | Its serum level is an independent prognostic factor for OS and CFS in melanoma patients. | (275) |
| miR-30d | 109 primary melanoma tissues and 17 melanoma metastases | Its high expression is associated with poor OS. | – | Its expression pattern is an independent prognostic factor for melanoma mortality. | (65) |
| miR-30b | 109 primary melanoma tissues and 17 melanoma metastases | Its high expression is associated with poor OS. | – | – | (65) |
| miR-92a | 75 melanoma tissues and paired ANTs | Its high expression is associated with poor OS. | – | – | (75) |
| miR-596 | 36 melanomas samples and 22 nevi | Its low expression was associated with significantly shorter OS. | – | – | (126) |
| miRNA-29c | 30 malignant melanoma tissues and 10 paracancer tissues | Its low expression associated with poor prognosis. | – | – | (128) |
| miR-365 | 40 melanoma tissues and paired ANTs | Its low expression associated with shorter OS and RFS. | – | – | (97) |
| miR-137 | 30 primary melanoma tissues and paired ANTs | Its low expression associated with poor survival. | – | Can be an independent risk factor of OS | (141) |
| miR-137 | 97 melanoma tissues and paired ANTs | Its low expression is associated shorter OS in melanoma patients. | – | Its expression is an independent prognostic marker of OS in melanoma patients. | (146) |
| miR-142-3p miR-142-5p | 66 stage III FFPE tissues | Their low expression associated with poor survival. | – | – | (118) |
| miR-21 | 86 primary cutaneous melanomas tissues, 10 melanoma metastases, 10 dysplastic nevi samples | Its high expression associated with shorter 5-year DFS and shorter 5-year OS. | – | Its expression pattern can be an independent prognostic factor for overall survival in melanoma patients. | ( |
| miR-21 | 12 FFPE primary melanoma tissues and 12 melanocytic nevi | Its high expression is associated with poor RFS and OS. | – | – | ( |
| miR-181 | 17 matched melanoma tissues before and after resistance of patients to BRAF inhibitors | Its low expression is correlated with low progression free survival (PFS) and OS | – | – | (172) |
| miR-4633-5p | 56 Primary human sinonasal mucosal melanoma tissues | – | Its expression pattern can be a prognostic factor in identifying metastatic sinonasal mucosal melanoma. | It can be an independent prognostic factor for metastasis. | (175) |
| miR-191 | 32 lymph node metastases | Its low expression associated with poor melanoma-specific survival. | – | – | (276) |
| miR-193b | 32 lymph node metastases | Its high associated with poor melanoma-specific survival. | – | – | (276) |
| hsa-miR-211-5p hsa-miR-514a-3p hsa-miR-508-3p hsa-miR-509-3-5p hsa-miR-513c-5p hsa-miR-513a-5p | UM dataset of miRNA expression profiles was obtained from the UCSC Xena Browser | Their high expression were associated with poor OS. | – | – | (277) |
| hsa-let-7b-5p hsa-miR-452-5p hsa-miR-224-5p hsa-miR-592 hsa-let-7b-3p hsa-miR-199a-5p | Their low expressions were associated with poor OS. | – | – | (277) | |
| Six miRNAs signature: mir-15 mir-342-3p mir-455-3p mir-145 mir-155 mir-497 | 59 metastatic and primary melanoma, Congenital nevi | This signature can estimate post-recurrence survival. | – | This miRNA signature is an independent predictor of post-recurrence survival in metastatic melanoma. | (278) |
| miR-338-5p | 46 melanoma tissues and 25 normal nevi samples | Its high expression is associated with decreased OS. | Its expression correlates to patient survival | It can be an independent prognostic factor for OS. | (48) |
| miR-203 | 148 melanoma tissues and paired ANTs | Its low expression is associated with poor OS. | – | It can be an independent prognostic marker for melanoma patients. | (136) |
| miR-29c | 149 melanoma tissues with AJCC stage I–IV | Its low expression is associated with poor DFS and OS in stage III melanoma patients. | Its expression correlates to DFS and OS | Its expression is significantly correlated to OS but not DFS. | (279) |
| miR-206 | serum samples from 60 melanoma patients and 30 healthy controls | Its low serum levels is associated with poor DFS and OS. | – | Its serum level is independent prognostic factors for DFS and OS. | (185) |
| miR-18b | 92 primary melanoma tissues and 48 benign nevi samples | Its low expression is associated with shorter OS. | – | – | (199) |
| miR-15b | 128 FFPE tissues of primary melanomas and 11 melanocytic nevi samples | Its high expression is associated with RFS and OS. | – | Its expression pattern can be an independent prognostic factor for DFS and OS. | (50) |
| miR-183 | 30 melanoma tissues and 14 normal skin samples | Its low expression is associated with poor OS. | – | – | (214) |
| miR-23a | Serum samples from 192 melanoma patients and 51 matched cancer-free controls | Its low serum level is associated with poor OS. | Its serum level is predictor of patients OS. | Its serum level is an independent prognostic biomarker for OS. | (106) |
| miR-23b | 114 primary melanoma tissues and ANTs | Its low expression is associated with short 3-year survival in melanoma patients. | – | – | (107) |
| miR-216a-5p | 86 uveal melanoma tissues | Its low expression is associated with poor DFS and OS. | – | – | (115) |
| miR-221 | Serum samples from 72 cutaneous malignant melanoma and 54 healthy controls | Its high expression is associated with poor RFS and OS. | – | Its expression can be an independent predictor of DFS and OS | (55) |
| miR-205 | 319 melanoma tissue samples | Its low expression is associated with short MMS in melanoma patients. | Its expression can be a predictor of MMS | Its expression pattern can be an independent prognostic marker for MMS | (280) |
| miR-205 | 65 primary melanoma tissues and 67 melanoma metastases | Its low expression is associated with shorter DMFS and MSS. | – | Its expression pattern can be an independent prognostic factor of MMS | (125) |
| miR-200c | 65 primary melanoma tissues and 67 melanoma metastases | Its low expression is associated with shorter DMFS and MSS. | – | Its expression pattern can be an independent prognostic factor of survival | (125) |
| miR-200a | 46 melanoma tissues and paired ANTs | Its low expression is associated with poor OS. | – | – | (195) |
| miR-125 | 65 primary melanoma tissues and 67 melanoma metastases | Its low expression is associated with shorter DMFS and MSS. | – | Its expression pattern can be an independent prognostic factor of survival | (125) |
| miR-150 | 51 melanoma tissues and paired ANTs | Its low expression is associated with short RFS and OS. | – | – | (117) |
| let-7b | 106 mucosal melanoma tissues, mucosal nevi samples | Its low expression is associated with poor DFS. | Its expression level correlates with DFS in melanoma patients | Its expression pattern is an independent prognostic marker for DFS | (211) |
| let-7c | 106 mucosal melanoma tissues, mucosal nevi samples | Its low expression is associated with poor DFS. | Its expression level correlates with DFS in melanoma patients | Its expression pattern is an independent prognostic marker for DFS | (211) |
| miR-126 | 108 primary cutaneous melanoma tissues, 18 melanoma metastases and 16 dysplastic nevi samples | Its low expression is associated with poor OS in melanoma patients | – | Can be an independent prognostic factor for overall survival | (251) |
| miR-127 | 40 melanoma tissues and paired ANTs | Its low expression is associated with short OS | – | – | (256) |
| miR-22 | 48 melanoma tissues and paired ANTs | Its low expression is associated with shorter OS | – | – | (257) |
| miR-610 | 105 melanoma tissues and ANTs | Its low expression is associated with short 5-year survival | – | – | (260) |
| miR-431 | 113 melanoma tissues and paired ANTs | Its low expression is associated with poor OS in melanoma patients | Can be a potential prognostic marker for melanoma patients | Can be an independent prognostic factor for melanoma patients | (267) |
| miR-140-3p | 25 melanoma tissues and paired ANTs | Its low is associated with poor OS | Its expression pattern correlates with OS in melanoma patients | Its expression pattern is an independent prognostic factor for OS in melanoma patients | (271) |
| miR-125b | 29 FFPE melanoma specimens and 16 intradermal nevus specimens | Its low expression is associated with short OS | – | Its expression level can be an independent prognostic marker for OS | (281) |
Role of melanoma in prediction of prognosis of melanoma (DMFS, distant metastasis free survival; OS, overall survival; DFS, disease-free survival; RFS, relapse-free survival; MSS, melanoma specific survival).
Receiver operating characteristic (ROC) curves have been used to assess the diagnostic or prognostic values of miRNAs in melanoma. Based on the area under curve (AUC) values, several miRNAs can be suggested as appropriate biomarkers for this kind of cancer. In the field of miRNA application in melanoma diagnosis, these curves depict the diagnostic capability of expression level of a miRNA as a binary classifier system for detection of melanoma cases as its discrimination threshold is changed. In other words, these curves are generated by plotting the true positive rate against the false positive rate at different threshold points. Notably, serum expression levels of several miRNAs have high sensitivity and specificity values for differentiating between melanoma patients and healthy subjects or between metastatic and non-metastatic melanomas. Tables 4, 5 list the miRNAs whose application as diagnostic or prognostic markers has been evaluated using ROC curve analysis, respectively.
Table 4
| microRNA | Expression pattern | Sample | Diagnostic biomarker | ROC curve analysis | Reference | ||
|---|---|---|---|---|---|---|---|
| Sensitivity | Specificity | Area under the ROC curves (AUC) | |||||
| miR-16 miR-211-5p miR-4487 miR-4706 miR-4731 miR-509-3p miR-509-5p | Upregulated Upregulated Downregulated Downregulated Downregulated Downregulated Downregulated | Serum samples | Diagnostic (diagnosis of presence of melanoma) | 93% | ≥ 82% | – | ( |
| miR-211-5p | Downregulated | Tissue samples | Diagnostic (invasive melanoma) | – | – | 0.933 | (282) |
| Tissue samples | Diagnostic (melanoma in situ) | – | – | 0.933 | |||
| Tissue samples | Diagnostic (dysplastic nevi) | – | – | 0.951 | |||
| miR-211 | Downregulated | Tissue samples | Diagnostic (discriminating melanomas from nevi) | 90% | 86.2% | 0.862 | (283) |
| miR-532-5p miR-106b | - - | Serum exosomes | Diagnostic (distinguishing melanoma patients from healthy individuals) | – | – | 0.936 | (284) |
| miR-15b-5p | Upregulated | Plasma samples | Diagnostic (diagnosis of cutaneous melanoma) | 90.0% | – | 0.80 | (285) |
| miR-150-5p | Upregulated | Plasma samples | Diagnostic (diagnosis of cutaneous melanoma) | 96.7% | – | 0.94 | |
| miR-149-3p | Upregulated | Plasma samples | Diagnostic (diagnosis of cutaneous melanoma) | 93.3% | – | 0.95 | |
| miR-193a-3p | Downregulated | Plasma samples | Diagnostic (diagnosis of cutaneous melanoma) | 76.7 | – | 0.84 | |
| miR-524-5p | Downregulated | Plasma samples | Diagnostic (diagnosis of cutaneous melanoma) | 90.0% | – | 0.80 | |
| miR-149-3p miR-150-5p miR-193a-3p | Upregulated Upregulated Downregulated | Plasma samples | Diagnostic (diagnosis of cutaneous melanoma) | 94.8% | – | 0.97 | |
| hsa-miR-186 hsa-let-7d hsa-miR-18a hsa-miR-145 hsa-miR-99a hsa-miR-664 hsa-miR-501-5p hsa-miR-378 hsa-miR-29c hsa-miR-1280 hsa-miR-365 hsa-miR-1249 hsa-miR-328 hsa-miR-422a hsa-miR-30 d hsa-miR-17 | Upregulated Upregulated Upregulated Upregulated Upregulated Upregulated Upregulated Upregulated - Upregulated Upregulated Upregulated Upregulated Upregulated - Downregulated | Blood samples (expression of miRNAs in blood cells) | Diagnostic | 98.9% | 95% | 97.4% | (286) |
| miR-125b | Downregulated | Tissue samples | Diagnostic biomarker (diagnosis of melanoma) | – | – | 0.880 | (281) |
| miR-211 | Downregulated | Serum samples | Diagnostic biomarker (distinguish metastatic from uveal melanoma localized one) | – | – | 0.96 | (287) |
| miR-16 miR-145 miR-146a miR-204 miR-211 miR-363-3p | Downregulated Downregulated Downregulated Downregulated Downregulated Downregulated | Serum samples | Diagnostic biomarker (identifying uveal melanoma) | 93% | 100% | – | |
| miR-10b | Upregulated | Serum samples | Diagnostic biomarker (distinguishing melanoma patients from controls) | – | – | 0.841 | (275) |
Application of miRNAs as diagnostic tools in melanoma.
Table 5
| microRNA | Expression pattern | Sample | Prognostic biomarker | ROC curve analysis | Reference | ||
|---|---|---|---|---|---|---|---|
| Sensitivity | Specificity | Area under the ROC curves (AUC) | |||||
| miR-150-5p | Downregulated | Serum samples | Prognostic (discrimination of survival in stage IV) | – | – | 0.69 | (118) |
| Tissue samples | Prognostic (discrimination of stage) | – | – | 0.733 | |||
| miR-142-3p | Downregulated | Serum samples | Prognostic (discrimination of stage IV from stage III) | – | – | 0.69 | |
| Tissue samples | Prognostic (discrimination of stage) | – | – | 0.797 | |||
| miR-142-5p | Downregulated | Tissue samples | Prognostic (discrimination of stage) | – | – | 0.733 | |
| miR-150-5p miR-142-3p miR-142-5p | Downregulated Downregulated Downregulated | Tissue samples | Prognostic (discrimination of stage) | – | – | 0.838 | |
| miR-4633-5p | Downregulated | Tissue samples | Prognostic (identifying metastatic sinonasal mucosal melanoma) | 87.5% | 100% | 0.88 | (175) |
| miR-1246 miR-185 | Upregulated Upregulated | Plasma samples | Prognostic (identifying metastatic melanoma) | 90.5% | 89.1% | – | (288) |
| miR-9 miR-145 miR-150 miR-155 miR-205 | Upregulated - - - - | Serum samples | Prognostic (distinguishing metastatic melanoma) | – | – | 0.77 | (289) |
| miR-532-5p miR-106b | - - | Serum exosomes | Prognostic (distinguishing patients with and without metastasis) | – | – | 0.818 | (284) |
| Serum exosomes | Prognostic (discriminates stage I–II patients from stage III–IV patients) | – | – | 0.820 | |||
| miR-23a | Downregulated | Serum samples | Prognostic (distinguishing primary melanoma from metastatic one) | 76.0% | 75.3% | 0.797 | (106) |
| miR-195 miR-224 miR-365a miR-365b miR-452 miR-4709 miR-7702 miR-513c miR-873 | - - - - - - - - - | Tissue samples | Prognostic biomarker (for OS) | – | – | 0.858 | (290) |
| let-7b | Downregulated | Tissue samples | Prognostic biomarker (for DFS) | – | – | 0.634 | (211) |
| let-7c | Downregulated | Tissue samples | Prognostic biomarker (for DFS) | – | – | 0.647 | |
| miR-10b | Upregulated | Serum samples | Prognostic biomarker (advanced stage vs early stage) | – | – | 0.785 | (275) |
Prognostic role of miRNAs in melanoma as identified by ROC curve analysis.
Implications of miRNAs in the Treatment of Melanoma
miRNAs are implicated in the therapeutic effects of several anti-cancer agents. For instance, Genistein, the isoflavone extracted from soybean, has been shown to suppress proliferation of human uveal melanoma cells possibly through modulating expression of miR-27a and its target gene ZBTB10 (291).
miRNAs are also involved in conferring resistance to immunotherapeutic modalities. For instance, expression of miR-222 has been shown to be higher in melanoma samples obtained from patients who did not respond to ipilimumab compared with those benefitting from this option (292). Mechanistically, the ADAR1/miR-222/ICAM1 axis has been reported to be involved in this process (292). Other miRNAs such as miR-488-3p, miR-195 and miR-211 participate in the regulation of response to the chemotherapeutic agent cisplatin (130, 162, 163)
Application of miRNAs in the therapeutic settings is limited by target specificity issues (293). However, some miRNAs are currently being tested in some diseases. Among these therapeutic modalities are miR-122/miravirsen and miR-92/MRG 110 which have been manufactured by Roche/Santaris and Regulus Therapeutics, respectively (293).
Association Between Polymorphisms Within miRNAs and Risk of Melanoma
Theoretically, polymorphisms with miRNA coding genes can alter their expression or function. Although such polymorphisms are predicted to influence the risk of different cancers such as melanoma, this field has not been vastly explored. Few studies have assessed association between a certain polymorphism within miR-146a namely the rs2910164 G/C and melanoma risk. In spite of the proposed role for allele C of this polymorphism in conferring risk of melanoma (294, 295), cell line studies have shown that G allele confers high proliferative capacity to melanoma cells (296). Table 6 summarizes the results of these studies.
Table 6
| microRNA | SNP | Genotyping method | Samples | Association with melanoma | Functional experiments | Reference |
|---|---|---|---|---|---|---|
| miR-146a | rs2910164G>C | – | Blood samples from 224 patients and 264 healthy controls | Allele C was associated with risk of melanoma in males and has allelic dosage effect (CC homozygotes has greater risk) | – | (294) |
| miR-146a and RNASEL polymorphisms interaction | rs2910164 G/C (in miR-146a) | PCR-RFLP | Blood samples from 304 sporadic melanoma patients and 314 control individuals | Men carrying allelic combination miR-146a rs2910164 C and RNASEL rs486907 A have highest risk of melanoma | – | (295) |
| rs486907 A/G (in RNASEL) | ||||||
| miR-146a | rs2910164 G/C | PCR-RFLP | Skin samples from 50 melanoma patients and 107 controls, 8 blood samples from patients | GC genotype was significantly increased in the patients compared with the controls | G allele confers high proliferative capacity to melanoma cell lines and GC cell lines have more invasive and migratory ability than CC cell lines | (296) |
Summary of studies which assessed association between miRNA polymorphisms and risk of melanoma.
Discussion
Dysregulation of miRNAs in melanoma samples and cell line have been reported by several studies. The functional consequences of such dysregulation on cell behavior have also been appraised. However, the underlying mechanism of such dysregulation is not clarified completely. Copy number variations in miRNA-coding genes or genes associated with the biogenesis or function of miRNAs may be responsible for the observed dysregulation of miRNAs in melanoma and other types of cancers (
Mechanistically, several melanoma-associated miRNAs function upstream or downstream of known oncogenes in melanoma. For instance, miR-137 and miR-182 are among miRNAs that target MITF oncogene (54, 300). Moreover, expressions of several miRNAs such as a number of let-7 family members, miR-221/222, miR-17-92 and miR-106-363 clusters, miR-29, miR-146a, miR-148b, and miR-125b have been shown to be modulated by MITF (298). Moreover, several miRNAs such as miR-7, miR-23a and miR-596 have functional interactions with MAPK/ERK and PI3K/PTEN/Akt signaling pathways in the context of melanoma. A number of miRNAs such as miR-378, miR-10b, miR-25, miR-485-5p, miR-708, miR-136, miR-488-5p, miR-29a, miR-22 and miR-140-5p have interactions with Wnt/β-catenin pathway. Finally, miR-21, miR-7-5p, miR-23b, miR-145-5p, miR-9, miR-29a, miR-377 and miR-140-5p interacts with NF-κB signaling in the context of melanoma development. Thus, a number of miRNAs provide functional links between cancer-related pathways in this context.
miRNAs have functions both in the paternal cell in which they are produced as well as in the adjoining cells. These transcripts can modulate characteristics of adjacent melanoma cells or directly affect tumor niche by modifying extracellular matrix and function of resident cells in this environment including fibroblasts and endothelial or immune cells. This activity of miRNAs potentiates them as contributors of melanoma metastatic potential through affecting intravasation of cancer cells into vessels, viability of tumor cells in the circulation, their leakage in the target tissues, and establishment of the pre-metastatic milieu in remote organs (301).
Several miRNAs have been shown to differentiate melanoma patients from healthy subjects or distinguish between metastatic and non-metastatic melanoma patients. The prognostic assays founded on miRNAs signature can enhance the efficacy of conventional staging systems in predicting patients’ prognosis and their management in the clinical settings in the terms of choosing adjuvant therapies or clinical trial enrolment. Therefore, these miRNAs are potential biomarkers for this kind of skin cancer.
Numerous miRNAs have been dysregulated in tumor samples or peripheral blood of patients with melanoma. Such dysregulation can be used as biomarker for early detection of melanoma or follow-up of patients after initial treatments to uncover any possible tumor recurrence. Blood-based biomarkers are expected to substitute invasive methods of cancer diagnosis in future. Based on the heterogeneous pattern of miRNAs expression in tumor samples and the varied expressions among affected individuals, multi-miRNA panels are more promising in the diagnostic approaches compared with individual miRNAs.
Finally, miRNAs might be implicated in the anti-cancer effects of a number of therapeutic agents including both chemical and herbal medicines. Evidence for supporting this idea has come from several studies including a study which revealed the role of miR-27a in mediating the anti-proliferative effects of Genistein in human uveal melanoma cells (291). Moreover, the observed up-regulation of miR-222 in melanoma samples obtained from patients who did not respond to ipilimumab compared with those benefitting from this option (292) implies its contribution in resistance to this agent. Therefore, miRNAs are promising targets for modulation of response of melanoma cells to a wide range of therapeutic options.
Perspectives and Future Directions
Assessment of expression pattern of miRNAs in cohorts of melanoma patients from different ethnicities and uncovering their association with genetic polymorphisms would facilitate design of prognostic/diagnostic panels. The relationship between aberrant miRNA profile and response to therapeutic regimens should be unraveled. Such kinds of approaches pave the way for design of personalized methods of treatment of melanoma. Therapeutic targeting of miRNAs can influence melanoma course and enhance sensitivity to both conventional therapies and immunotherapeutic approaches. Yet, safety and bioavailability issues remained to be solved before implementation of these techniques in the clinical settings.
Statements
Author contributions
SG-F and MT wrote the draft and revised it. MG collected the tables and designed it. All authors contributed to the article and approved the submitted version.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Summary
Keywords
miRNA, melanoma, biomarker, expression, polymorphism
Citation
Ghafouri-Fard S, Gholipour M and Taheri M (2021) MicroRNA Signature in Melanoma: Biomarkers and Therapeutic Targets. Front. Oncol. 11:608987. doi: 10.3389/fonc.2021.608987
Received
22 September 2020
Accepted
30 March 2021
Published
22 April 2021
Volume
11 - 2021
Edited by
Giuseppe Palmieri, National Research Council (CNR), Italy
Reviewed by
Georg Wondrak, University of Arizona, United States; Eva Hernando, New York University, United States
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Copyright
© 2021 Ghafouri-Fard, Gholipour and Taheri.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Mohammad Taheri, mohammad_823@yahoo.com
This article was submitted to Skin Cancer, a section of the journal Frontiers in Oncology
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