REVIEW article

Front. Oncol., 22 April 2021

Sec. Skin Cancer

Volume 11 - 2021 | https://doi.org/10.3389/fonc.2021.608987

MicroRNA Signature in Melanoma: Biomarkers and Therapeutic Targets

  • 1. Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran

  • 2. Urology and Nephrology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran

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

, ). On the other hand, miR-205 is decreased in melanoma. This miRNA inhibits expression of E2F1 through binding with its 3’ UTR. E2F1 increases expression of MELK. MELK activates mTORC2 through binding with MLST8. mTORC2 has a role in phosphorylation and activation of AKT ().

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 (). Levati et al. have demonstrated up-regulation of miR-17-5p, miR-18a, miR-20a, and miR-92a while down-regulation of miR-146a, miR-146b and miR-155 in most of assessed melanoma cell lines compared with melanocytes ().

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 (, ). Moreover, expression of miR-210 has been demonstrated to be elevated in several cancer types including melanoma. Its expression has been correlated with metastatic potential of melanoma tumors. Up-regulation of miR-210 in cancer cell lines facilitates evasion from hypoxia-induced cell cycle arrest and partly upturned the hypoxic gene expression profile. This miRNA has been revealed to target a known MYC antagonist namely MNT. Therefore, miR-210 has been shown to modulate the hypoxia response in cancer cells via regulating an important transcriptional suppressor of the MYC-MAX axis (). In an attempt to detect the miRNAs that are regulated by BRAFV600E mutation via the ERK pathway, Vitiello et al. have conducted RNA sequencing on A375 cell line and a vemurafenib-resistant clone. Their experiments have led to identification of miR-204 and miR-211 as the utmost over-expressed miRNAs by vemurafenib. In spite of belonging to an identical miRNA family, miR-204 and miR-211 have distinguishing characteristics. miR-204 is regulated by STAT3 and its transcript levels are increased in amelanotic melanoma cells, where it functions as a mediator of anti-migratory effects of vemurafenib by modulating expression of AP1S2. On the contrary, miR-211, as a direct target of MITF, is over-expressed in melanotic melanoma cells. miR-211 regulates expression of EDEM1 and subsequently weakens the destruction of Tyrosinase. Thus, miR-211 is a facilitator of pro-pigmentation function of vemurafenib (). Table 1 displays the list of over-expressed miRNAs in melanoma.

Table 1

microRNASamplesAssessed cell linesFunctional analysisGene interactionSignaling pathwayAssociation with clinical featuresFunctionReference
miR-211SCID 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 linesYesPI3K signaling pathwayHas 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-211-5pNOD/SCID/IL2gR-/- (NSG) mice (A375 cell line was injected to mice)A375, SK-Mel-103, SK-Mel-28, SK-Mel-147YesNUAK1, SLUGPromotes proliferation and induces resistance to vemurafenib and MEK inhibitor trametinib in melanoma cells ()
miR-211-5p86 melanoma tissues, serum samples from 130 healthy controls and 255 melanoma patientsNoDisease stage, survivalA possible diagnostic biomarker ()
miR-1686 melanoma tissues, serum samples from 130 healthy controls and 255 melanoma patientsNoDisease stageA possible diagnostic biomarker ()
miR-204-5pNOD/SCID/IL2gR-/- (NSG) mice (A375 cell line was injected to mice)A375, SK-Mel-103, SK-Mel-28, SK-Mel-147YesEFNB2, NUAK1, SLUGPromotes proliferation and induces resistance to vemurafenib and MEK inhibitor trametinib in melanoma cells ()
miR-37836 melanoma tissues and paired ANTs, 14 Nude athymic BalB/C mice (A875 cell line was injected to mice)A875, A375YesFOXN3Wnt/β-catenin signaling pathwaylymph node metastasisInduces migration and invasion and activates EMT process in melanoma cells through downregulation of FOXN3 and activation of Wnt/β-catenin pathway ()
miR-378a-5pFFPE tissues specimens of 27 metastatic melanoma and 13 in situ melanoma, female mice (M14 cell line was injected to mice)M14, A375, SBCL1, HUVECYesSTAMBP, HOXD10Enhances migration, invasion and angiogenesis ability of melanoma cells ()
miR-190871 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, HUVECsYesApoE, DNAJA4ApoE signalingshorter metastasis-free survivalAugments invasion, metastasis, metastatic endothelial recruitment (MER) and angiogenesis in melanoma cells through targeting ApoE and DNAJA4 ()
miR-199a-3pYesApoE, DNAJA4ApoE signalingshorter metastasis-free survival ()
miR-199a-5pYesApoE, DNAJA4ApoE signalingshorter metastasis-free survival ()
miR-106b97 primary cutaneous melanoma tissue samples, 17 melanoma metastases, 15 dysplastic neviNoPoor prognosis, Breslow thickness, tumor ulceration, advanced clinical stageMay implicate in progression of cutaneous melanoma and can be a potential prognostic biomarker ()
miR-106aA375, A2058, HEMn,YesCx43Enhances melanoma cells proliferation via suppression of Cx43 ()
miR-146aFFPE 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.F10YesStat1TNM stageNegatively regulates immune responses. also affects proliferation, migration and mitochondrial fitness of melanoma cells through regulating STAT1/IFNγ axis ()
miR-146aMice (A375 cell line was injected to mice)A375, MA-1, MC-1, MA-2, MC-2, WK-MelYesLFNG, NUMB, ITGAV, ROCK1NOTCH/PTEN/Akt pathwayHas dual function. It enhances melanoma cell growth but inhibits metastasis formation (and is poorly expressed in circulating tumor cells) ()
miR-146a10 primary melanoma and nevus tissues from the same patients and 15 primary melanoma tissues and metastases from the same patientsWI-38, IMR-90t, 293T, SKMEL28YesNUMBNotch signaling pathwayIncreases proliferative ability and tumorigenecity of melanoma cells through targeting NUMB ()
miR-146a55 melanoma tissues and paired ANTsA375, WM115, M14, G361, HACATYesSMAD4TNM stage, lymph node metastasisPromotes migration and invasion of melanoma cells through targeting SMAD4 ()
miR-10bFFPE tissue specimens of 40 primary melanomas that are metastasis-free, 39 primary melanomas with metastasis, 32 metastasesNoTumor metastasisIs a potential prognostic biomarker in detection of thicker melanomas that have enhanced risk of metastasis ()
miR-10bMel 505, PMWK, sk-mel-28, sk-mel-24, VMM39, MEL 224, YUHEF, YUROB,YesIts expression positively correlates with B-RafV600E mutation and increases anchorage-independent growth of B-Raf wild-type melanoma cells ()
miR-10b78 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 melanocytesYesITCHWnt/β-catenin signaling pathwayOverall survivalIts knockdown results in ITCH-mediated suppression of proliferation, migration and invasion in melanoma cells. ()
miR-2167 malignant melanoma tissue and 67 normal control skin samplesNoPDCD4tumor size, higher Clark classification level, lymph node metastasesCan be a possible biomarker or therapeutic target in melanoma ()
miR-2186 primary cutaneous melanomas tissues, 10 melanoma metastases, 10 dysplastic nevi samplesHTB-67, A375YesOverall survival, Breslow thickness, advanced
clinical stage,
Its silencing suppresses growth and increases apoptosis, chemosensitivity and radiosensitivity of melanoma cells ()
miR-2112 FFPE primary melanoma tissues and 12 melanocytic neviWM9, WM35b, WM451, WM793, WM951,
WM1205, SKMel23, SKMel113, MV3, MEWO
YesCdc25aRecurrence-free survival, overall survivalIts downregulation promotes apoptosis. ()
miR-21female 01B74 Athymic NCr-nu/nu mice (A375 cell line was injected to mice)WM1552c, WM793b, MEL 39, A375YesTIMP3Increases invasive ability of melanoma cells through targeting TIMP3 (39)
miR-2145 melanoma tissues and ANTsA375YesSPRY1, PDCD4, PTENERK/NF-κB signaling pathwayhistological
differentiation, TNM stage, lymphatic metastasis
Its inhibition decreases proliferation, migration and invasion and induces apoptosis (40)
miR-21BALB/c nude mice (OCM-1 cell line was injected to mice)OCM-1, M619, MuM-2BYesp53Promotes proliferation, migration and invasion of melanoma cells through targeting p53 (41)
miR-21-5p20 melanoma tissues and paired ANTsA375, M14YesCDKN2CEnhances proliferation and cell cycle G1/S transition in melanoma cells through targeting CDKN2C (42)
miR-65226 uveal melanoma tissues and paired ANTsMUM-2B, MEL270, ARPE-19YesHOXA9HIF-1alpha signalingIncreases proliferation and migration in uveal melanoma cell through promoting HIF-1alpha signaling by suppression of HOXA9 (43)
miR-36728 uveal melanoma tissues and paired ANTsM17, M23, MUM-2B, C918, um95YesPTENEnhances proliferation and migration in uveal melanoma cell via targeting PTEN (44)
miR-4286FFPE specimens of 16 melanoma tissues and 3 melanocytic nevi samplesBRO, SK-MEL-1YesAPLN, FPGS, GPR55, HMGA1, RRN3, TP523Its inhibition results in decreased proliferation and increased apoptosis. (45)
miR-36750 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-LPYesPTENDecreased overall survival, tumor thickness, TNM stage, lymph node involvement, distant metastasisElevates proliferation, migration and invasion in cutaneous melanoma cells through targeting PTEN (46)
miR-6387 primary melanomas, 9 lymph node metastases, and 8 remote skin metastasesBRO, A-375, HT144, RPM-MC, 1F6, HEM, SK-Mel-147, SK-Mel-28YesTP53INP2p53 signaling pathwayEnhances proliferation and invasion of melanoma cells and prevents apoptosis and autophagy via targeting TP53INP2 (47)
miR-338-5p46 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-LPYesCD82AKT pathwayPoor
Prognosis, patients survival, tumor stage, metastasis
Promotes proliferation and metastasis via targeting CD82 (48)
miR-363-3pA2058, WM793BYesp21Promotes stemness of melanoma cells via suppression of p21 (49)
miR-15b128 FFPE tissues of primary melanomas and 11 melanocytic nevi samplesWM9, WM35, WM451, WM793, WM951, WM1205, SKMel23, SKMel113, MV3, MeWoYesOverall survivalIts knockdown decreases proliferation and induces apoptosis. (50)
miR-45425 uveal melanoma tissues and ANTsOCM‐1A, MUM‐2C, C918, MUM‐2B, D78YesPTENPromotes cell proliferation, colony formation and invasion uveal melanoma cells (51)
miR-21457 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-LPYesTFAP2CEnhances cell movement and metastasis via suppression of TFAP2C (52)
miR-122-5pHuman melanoma tissues and pigmented nevus tissues293T, SK-MEL-110, A375YesNOP14Its inhibition represses proliferation and induces cell cycle arrest at G1 phases through regulation of NOP14 (53)
miR-18222 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, WM35YesFOXO3, MITF-MEnhances migration, invasion and metastasis in melanoma cells through suppression of FOXO3 and MITF-M expression (54)
miR-221Serum samples from 72 cutaneous malignant melanoma and 54 healthy controlsNoPatient survival, tumor thickness, differentiation, T classification, N classification, metastasis, advanced clinical stageCan be a potential prognostic biomarker in cutaneous melanoma (55)
miR-221WM35, WM983A, WM164, 1205LuYescKit, p27 (Kip1)Promotes proliferation of melanoma cells through targeting cKit and p27. Also its inhibition induces apoptosis ()
miR-7678 melanoma tissues and ANTsMeWo, MHEM, A375, WM-115, UACC257,
WM35, A7, PEM
YesCYLDEnhances proliferation of melanoma cells through inhibition of CYLD (56)
miR-135a20 melanoma tissues and paired ANTsHEM, sk-mel-1, A375YesFOXO1AKT signaling pathwayPromotes melanoma cells proliferation, tumorigenicity and cell cycle progression via targeting FOXO1 ()
miR-135b20 melanoma tissues and paired ANTsA-375YesLATS2Its inhibition decreases proliferation and migration and induces apoptosis in melanoma cells (57)
miR-25A875, MV3, M14, uacc-257, HEM-aYesRBM47PI3K/Akt/mTOR signaling pathwayPromotes proliferation and migration of melanoma cells through targeting RBM47 (58)
miR-2530 primary melanoma tissues and related non-cancerous skin samplesHEM, MV3, SK-HEP-1, A375YesDKK3WNT/β-Catenin signaling PathwayEnhances proliferation and invasion in melanoma cells via targeting DKK3 (59)
miR-125a22 melanoma tissueSK-MEL-239, A375, 451LuYesBAK1, MLK3Promotes BRAF inhibitors resistance through inhibition of intrinsic apoptotic pathway by targeting BAK1 and MLK3 (60)
miR−106b−5p18 primary melanoma tissues and 18 benign neviSK-MEL-1, A-375, HEMYesPTENAkt/ERK signaling pathwayPromotes proliferation and progression of melanoma through targeting PTEN and regulation of Akt/ERK pathway (61)
miR-181b3 uveal melanoma tissues and 3 normal tissuesSP6.5, VUP, OCM1, 92-1, MUM2bYesCTDSPLPromotes cell cycle progression in uveal melanoma cells through targeting CTDSPL (62)
miR-7698 melanoma tissues and ANTsg MHEM, SK-MEL-28,
WM-115, UACC257, A375, A7, MeWo, PEM
YesGSK3BEnhances proliferation of melanoma cells via targeting GSK3B and suppression of its expression (63)
miR−20a10 uveal melanoma tissues and 10 normal uveal tissuesMUM-2B, MUM-2C, D78YesPromotes proliferation, migration and invasion in uveal melanoma cells (64)
miR-30d109 primary melanoma tissues and 17 melanoma metastasesHEK293T, A375, B16F10, WM35, WM98YesGALNT7Overall survival, tumor thickness, tumor stage, shorter time to recurrencePromotes metastatic capacity of melanoma cells through targeting GALNT7 (65)
miR-30b109 primary melanoma tissues and 17 melanoma metastasesHEK293T, A375, B16F10, WM35, WM98YesOverall survival, tumor thickness, tumor stage, shorter time to recurrencePromotes metastatic capacity of melanoma cells (65)
miR-224Primary melanoma tissues and melanoma metastases, athymic NMRI nude miceSK-Mel-28, SK-Mel-29, SK-Mel-103, SK-Mel-147YesTXNIPIncreases migration and invasion and induces EMT process through targeting TXNIP (66)
miR-452Primary melanoma tissues and melanoma metastases, athymic NMRI nude miceSK-Mel-28, SK-Mel-29, SK-Mel-103, SK-Mel-147YesTXNIPIncreases migration and invasion and induces EMT process through targeting TXNIP (66)
miR-19b14 melanoma tissues, C57BL/6 mice293T, A2058, CRL1579, SKMEL28, G361, HNEMYesPITX1Regulates proliferation and hTERT expression in melanoma cells through targeting PITX1 (67)
miR-315121 RNA samples of melanoma patientsMM A375, Mel-39, MeWo, HEK293, A375YesTP53Its knockdown induces TP53-mediated inhibition of proliferation and promotion of apoptosis in melanoma cells (68)
miR-301a46 melanoma tissues and 18 benign melanocytic naeviSK-MEL-1, A-375YesPTENAkt and FAK signaling pathwaysPoor prognosis, metastasisIts inhibition suppresses proliferation, colony formation, migration and invasion in melanoma cells through targeting PTEN. (69)
miR-4262110 cutaneous melanoma tissues and ANTsHACAT, HFF, A375, Malme-3M, SK-MEL-2, SK-MEL-5, M14YesKLF6Promotes proliferation of melanoma cells through targeting KLF6 (70)
miRNA-106bFemale athymic nude mice (A375 cell line was injected to mice)A375, Hs294t, SK-Mel28, SK-Mel 119, Mel 1241, Mel 1011, Mel 928, NHEMYesIts downregulation inhibits melanoma cells proliferation and induces cell cycle arrest at G1 phase (71)
miR-519d21 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, MeWoYesEphA4ERK1/2 signaling pathwayPromotes proliferation, migration and invasion of melanoma cells via downregulation of EphA4 (72)
miR-37041 melanoma tissues and ANTs, BALB/c nude mice (A375 cell line was injected to mice)SK-MEL-1, A375, HEMn-LPYesPDHBTNM stagePromotes proliferation, invasion and glycolysis in melanoma cells and induces apoptosis through targeting PDHB (73)
miR-37316 melanoma tissues and normal skin samplesA375, WM115, WM75, melaYesSIK1Promotes migration of melanoma cells through targeting SIK1 (74)
miR-92a75 melanoma tissues and paired ANTsA375.S2, A7, MeWo, RPMI-7951, SK-MEL-5, SK-MEL-24, SKMEL-28, PEMYesOverall survival, tumor stage, lymph node metastasis, distant metastasisIts knockdown suppresses proliferation and migration of melanoma cells (75)
miR-51762 melanoma tissues and 40 normal skin tissuesHACAT, A375, G-361, OCM-1YesCDKN1CJNK signaling pathwayIts silencing induces oxidative stress injury in melanoma cells through upregulation of CDKN1C and inactivation of JNK signaling pathway (76)
miR-27a43 paraffin‐embedded melanoma tissues and 22 pigmented nevus samples, female BALB/c nude mice (A375 cell line was injected to mice)Mel‐RM, A375YesSYKmTOR signaling pathwayTNM staging, lymph node metastasisIts silencing promotes autophagy and apoptosis in melanoma cells through SYK-mediated modulation of mTOR signaling pathway (77)
miR-1868 melanoma tissues and ANTsA375-S2, SKMEL-28, SKMEL-5, MeWO, RPMI-7951, NHEMYesCYLDEnhances proliferation and anchorage-independent growth of melanoma cells via downregulation of CYLD (78)
miR-1246Tissues from 43 melanoma patientsHEM, A375, A2058YesFOXA2promoted cell viability and metastasis in melanoma cells via targeting FOXA2 (79)
miR-15020 melanoma tissues and paired ANTsM14, A357, WM115, NHEMYesPDCD4Its silencing inhibits cell proliferation, migration and invasion and induces apoptosis in melanoma cells. (80)
miR-520f10 melanoma and paired ANTsUACC257, WM-115, A7, MeWo, A375, NHEM, WM-115, PEMYesITCHPromotes proliferation, colony construction and anchorage-independent growth in melanoma cells via targeting ITCH (81)
miR−63311 melanoma tissues and 10 ANTsA375, A2058, B16, MEL-RM and M21YesKAI1Raises 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 lists the down-regulated miRNAs in melanoma.

Table 2

microRNASamplesAssessed cell linesFunctional analysisGene interactionSignaling pathwayAssociation with clinical featuresFunctionReference
miR-4296 BALB/c-nu mice (A375 cell line was injected to mice)A-375, 293TYesAKT1Represses proliferation and migration of melanoma cells by targeting AKT1 (87)
miR-429-5p55 melanoma tissues and normal skin tissuesA375, PEMYesLIMK1Tumor thickness, tumor stageBlocks migration and invasion of melanoma cells through targeting LIMK1 (88)
miRNA-32623 melanoma tissues and paired ANTsSK-MEL-28, A375, HT144, A2058, HEMsYesKRASAKT and ERK signaling pathwaysSuppresses cell proliferation and invasion and promotes apoptosis through downregulation of KRAS and inactivating AKT and ERK signaling pathways (89)
miR-34b5 uveal melanoma tissues and ANTsSP6.5Yesc-MetIts overexpression expression inhibits melanoma cells proliferation and migration and induces cell cycle arrest by targeting c-Met (90)
miR-34c5 uveal melanoma tissues and ANTsSP6.5Yesc-MetIts overexpression expression inhibits melanoma cells proliferation and migration and induces cell cycle arrest by targeting c-Met. (90)
miR-34aM17, M23, SP6.5, U-96YesLGR4, MMP2Its overexpression decreases migration and invasion of uveal melanoma cells through targeting LGR4 and regulation of EMT process. (91)
miR-34a6 in situ melanoma tissues, 6 metastatic melanoma tissues, 6 nevi tissue and 18 ANTsWM35, WM451, A375YesFLOT2Its overexpression represses proliferation and metastasis in melanoma cells via targeting FLOT2. (92)
miR-34a3 uveal melanoma tissuesM17, M21, M23, SP6.5, D78, HEK-293Yesc-MetAkt and ERK1/2 signaling pathwaysSuppresses proliferation and migration of uveal melanoma cells through downregulation of c-Met (83)
miR-34aFifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice)C8161 (HAG), C81-61 (PAG)YesSuppresses proliferation, invasion and tube formation in melanoma cells (93)
miR-184Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice)C8161 (HAG), C81-61 (PAG)YesSuppresses proliferation, invasion and tube formation in melanoma cells (93)
miR-182Uveal melanoma tissues and normal uveal tissues, Female nude mice (M23 and SP6.5 cell lines were injected to mice)M23, SP6.5, HEK-293YesMITF, BCL2 and cyclin D2Akt and ERK1/2 signaling pathwaysInhibits cell proliferation, migration and invasion and promotes apoptosis in melanoma cells (94)
miR-185Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice)C8161 (HAG), C81-61 (PAG)YesSuppresses proliferation, invasion and tube formation in melanoma cells (93)
miR-18552 cutaneous melanoma tissues, 41 uveal melanoma tissues and 35 normal skin specimensG361, GR-M, OCM-1YesIL-10RαIts ectopic expression decreases proliferation of all melanoma cell lines through targeting IL-10Rα (95)
miR-204Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice)C8161 (HAG), C81-61 (PAG)YesSuppresses proliferation, invasion and tube formation in melanoma cells (93)
miR-365Skin Cutaneous Melanoma (SKCM) dataset for 470 melanoma samples was downloaded from TCGANHEM, A375, A2058, SK-MEL-2, SK-MEL-28YesBCL2, CCND1Inhibits cell proliferation, migration and invasion and promotes apoptosis in melanoma cells. (96)
miR-36540 melanoma tissues and paired ANTs, female BALB/c nude mice (A375 cell line was injected to mice)A375, G361, LIBR, HME1YesNRP1lymph node metastasis, clinical stage, overall survival, relapse-free survivalInhibits melanoma growth and metastasis by targeting NRP1 (97)
miR-485-5p20 human primary melanoma tissues and paired ANTsA375, SK-HEP-1, SK-MEL-1, MV3, HPMYesFZD7wnt signaling pathwaySuppresses proliferation and invasion of melanoma cells through targeting FZD7 and consequently inhibition of wnt signaling (98)
miR-61289 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
YesEspinmelanoma thickness, lymph node metastasis, poor survivalIts overexpression inhibits melanoma growth, migration and invasion through downregulation of Espin also sensitizes melanoma cells to doxorubicin (99)
miR-7-5p20 male NOD.CB17-Prkdcscid Il2rgtm1Wjl/SzJ (NSG) mice (1205Lu cell line was injected to mice)WM266-4, SK-MEL-2, A2058, 1205LuYesRelANF-κB signaling pathwayInhibits cell proliferation, migration and invasion in melanoma via inhibiting RelA and reducing activity of NF-κB signaling (100)
miR-7-5pWM266-4, A375, A2058YesIRS-2Akt signaling pathwayInhibits migration and invasion of melanoma cells through targeting IRS-2 and inhibition of Akt signaling (101)
miR-7BALB/c nude mice (A375 cell line was injected to mice)A375, Mel-CVYesEGFR, IGF-1R, CRAFMAPK and PI3K/AKT signaling pathwaysIts upregulation reverses BRAF inhibitor resistance in melanoma cells through inhibition of MAPK and PI3K/AKT signaling pathways (102)
miR-153-3p20 melanoma tissues and matched ANTsA375, SK-MEL-28, D78YesSNAI1Its overexpression represses proliferation and invasion and induces apoptosis by downregulating SNAI1 (103)
miR-62530 melanoma tissues and paired ANTs, SPF grade male BALB/c nude mice (A375 cell line was injected to mice)A375, M14YesSOX2Inhibits proliferation, migration and invasion of melanoma cells by targeting SOX2 (104)
miR-23a30 specific-pathogen‐free (SPF) closed colony male ICR mice (B16 cell line was injected to mice)B16YesSDCBPMAPK/ERK Signaling PathwayIts 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-23aSerum 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, A375YesATG12AMPK-RhoA pathwayPatient survival, tumor thickness, ulceration, AJCC stageDecreases migration and invasion in melanoma cells through targeting ATG12 and regulation of autophagy (106)
miR-23b114 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, nHEMYesNAMPTNF-κB signaling pathwayPatient survival, Clark level, sentinel-lymph-node positive, AJCC stageSuppresses cell proliferation and angiogenesis and promotes apoptosis through targeting NAMPT (107)
miR-23a-3p117 mucosal melanoma and 12 mucosal nevi, female NOD/SCID mice (HMVII cell line was injected to mice)GAK, VMRC-MELG, HMVII, HEK293TYesADCY1cAMP and MAPK signaling pathwaysTNM stage, poor overall survival and disease free survivalInhibits proliferation, migration and invasion of mucosal melanoma cells through targeting ADCY1 and inhibition of cAMP and MAPK signaling pathways (108)
miR-15a24 C57BL/6 mice (B16-F10 cell line was injected to mice)A375, SK-MEL-28, WM1552C, B16-F10YesCDCA4, AKT3Inhibits cell proliferation, migration and invasion and contributes to cell cycle arrest at G1/G0 phase through targeting CDCA4 (109)
miR-15a52 cutaneous melanoma tissues, 41 uveal melanoma tissues and 35 normal skin specimensG361, GR-M, OCM-1YesIL-10RαIts ectopic expression decreases proliferation of all melanoma cell lines through targeting IL-10Rα (95)
miR-143-3p30 formalin fixed paraffin-embedded (FFPE) primary melanoma lesions and lymph nodeNHEM, Sk-Mel-28, A375, WM983A, WM1862YesCOX-2Represses cell proliferation, migration and invasion and induces apoptosis through targeting COX-2 (110)
miR-143NHEM, WM115, SK-Mel-28, A2058YesIts overexpression inhibits cell proliferation and induces apoptosis in melanoma cells (111)
miR-70860 C57BL/6J male mice (B16 cell line was injected to mice)B16, B16F10, HEK293YesBAMBIWnt Signaling Pathway, TGF-β Signaling PathwayIts 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-70840 clean male Kunming mice (B16 cell line was injected to mice)B16, A375, WM239, WM451YesLEF1Wnt signaling pathwayIts overexpression expression inhibits proliferation, migration and invasion and induces apoptosis in melanoma cell through targeting LEF1 (113)
miR-216b30 melanoma tissues and ANTs, NOD-SCID mice (A375 cell line was injected to mice)HEK-293T, A375, A875, SK-MEL-1, HaCaTYesFOXM1FOXM1 signaling pathwayDecreases proliferation, migration and colony formation ability of melanoma cells by targeting FOXM1 (114)
miR-216a-5p86 uveal melanoma tissues, nude mice (A375 cell line was injected to mice)HEK293T, A375, MUM-2B,YesHK2Patient survivalSuppresses proliferation and dampens glycolysis in melanoma cell via targeting HK2 (115)
miR-150-5pnude mice (A375 cell line was injected to mice)A375, SK-MEL-2, HEK293TYesSIX1Inhibits 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
YesMYBPatient prognosisRepresses proliferation, migration and invasion of melanoma cells by inhibition of MYB (117)
miR-150-5p52 serum samples from stage III and 40 serum samples from stage IV patients, 76 stage III and 10 stage IV FFPE tissue samplesNoPatient survival,A potential prognostic biomarker (118)
miR-142-3p52 serum samples from stage III and 40 serum samples from stage IV patients, 76 stage III and 10 stage IV FFPE tissue samplesNoPatient survival, disease stageA potential prognostic biomarker (118)
miR-142-5p52 serum samples from stage III and 40 serum samples from stage IV patients, 76 stage III and 10 stage IV FFPE tissue samplesNoPatient survival, disease stageA potential prognostic biomarker (118)
miR-13640 male Kunming mice (B16 cell line was injected to mice)B16, A375, WM239, WM451YesPMELWnt signaling pathwayIts 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-214RNA‐seq data of 342 melanoma tumors were downloaded from TCGAMRA2, MRA4, MRA5, MRA6, MRA9YesANKRD6, CTBP1Its overexpression enhances malignant properties of melanoma cells and induces drug resistance in these cells through targeting negative regulators of Wnt signaling. (120)
miR-125b48 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, A375YesITGA9Inhibits proliferation, invasion and EMT process in melanoma cells by targeting ITGA9 (121)
miR-125b68 primary malignant melanoma tissues and 49 lymph node metastasesNHEM, Mel Im, Mel Ju, Melanoma Ho, A375YesMLK3c-Jun signaling pathwayIts overexpression reduces proliferation and invasion of melanoma cell by targeting MLK3/JNK pathway (122)
miR-125b5 primary melanoma tissues and 5 melanoma metastasesMel Juso, Mel Im, Mel Ju, A375, 1205 Lu, HMB2, NHEMYesc-JunIts upregulation reduces proliferation and migration in melanoma cell by targeting c-Jun (123)
miR-125bIGR, SK-Mel28, SK-Mel25, SK-Mel5, MelJuso, SM, MeWoYesVDRvitamin D signalingInfluences VDR expression and resistance of melanoma cell lines to 1,25(OH) (2)D (3) (124)
miR-125b65 primary melanoma tissues and 67 melanoma metastasesA375, SKMEL-147, 451 LuNoPatient survival, Breslow thickness, ulceration, Mitosis/mm2, growth phase,Can be a potential prognostic biomarker (125)
miR-596FFPE tissues specimens of 36 melanomas and 22 neviA375, SK-Mel-19, A2058, Malme-3M, SK-Mel-12, SK-Mel-2, Malme-3YesMEK1, MCL1, BCL2L1MAPK/ERK signaling pathwayPoor overall survivalIts 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‐137A2058, WM793B, HEMa‐LP, HEK‐293TYesFGF9Its enforced expression by Propofol decreases proliferation, migration and invasion in melanoma cells through inhibition of FGF9 expression (127)
miRNA-29c30 malignant melanoma tissues and 10 paracancer tissuesA375, SK-MEL-1, SK-MEL-5, HEMa-LPYesCDK6Poor prognosis, TNM stageReduces cell proliferation and induces cell cycle arrest at G1 phase through suppressing expression of CDK6 (128)
miR-488-5pprimary melanoma tumors, melanoma metastases, normal skin and neviMel Im, 501mel, NHEMYesDIXDC1Wnt/β-catenin signaling pathwayHas a tumor suppressive role. Its overexpression represses proliferation and migration and induces apoptosis in melanoma cells (129)
miR-488-3p20 malignant melanoma tissues and ANTs, 12 male Nu/Nu miceA375, B16, SK-MEL-28, WM451, HEMn-LPYesPRKDCIts ectopic expression sensitizes melanoma cells to cisplatin via targeting PRKDC (130)
miR-67521 melanoma tissues and ANTsA375, A2058, HT144, SK-MEL-28, HEMYesMTDHHas a tumor suppressive role. Its overexpression inhibits proliferation and invasion in melanoma cells partly by targeting MTDH (131)
miR-622Primary 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, NHEMYesKRASPatient survivalIts re-expression suppresses proliferation, migration and clonogenicity in melanoma cells. (132)
miR-92Female C57Bl/6 mice (B16-F10 cell line was injected to mice)B16-F10Yesintegrin αV and α5TGFβ signaling pathwayImplicates in integrin activation of TGFβ in melanoma cancer stem cells that gives rise to immunosuppressive tumor microenvironment and increased tumorigenesis (133)
miR-448786 melanoma samples, serum samples from 130 normal controls and 255 melanoma casesNoDiseases stage, survivalA probable diagnostic biomarker ()
miR-4706NoDiseases stage, survival ()
miR-4731NoDiseases stage ()
miR-509-3pNoDiseases stage ()
miR-509-5pNoDiseases stage ()
miR-203KMeC, LMeC, CMeC-1, A2058, Mewo, HEMYesCREBInhibits melanoma growth and melanosome transport regulating CREB/MITF/RAB27a pathway (134)
miR-2038 primary melanoma tissues, 11 metastases and 5 normal skin tissuesA375, A2058, SKMEL13, HT144, SKMEL5YesBMI1Tumor metastasisRepresses melanoma cells invasion and tumor sphere formation by targeting BMI1 (135)
miR-203148 melanoma tissues and paired ANTsNoOverall survival, tumor thickness, tumor stageCan be a potential prognostic factor and a new therapeutic target for the treatment of melanoma (136)
miR-203A2058, Mewo, HEMa-LPYeskif5bIts exogenous expression suppresses melanoma cells growth and regulates melanosomes transport and tyrosinase expression through targeting kif5b (137)
miR-203Mewo, A2058, HEMYesE2F3a, E2F3b, ZBP-89Induces cell cycle arrest and senescence in melanoma cells via targeting E2F3 (138)
miR-20324 melanoma tissues and paired ANTsA375, HaCaT,YesversicanInhibits migration of melanoma cells through targeting versican (139)
miR-17-3p28 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, UMsYesPVT1, MDM2p53 signaling pathwayIts overexpression inhibits proliferation, migration and invasion and promotes apoptosis through PVT1/miR-17-3p/MDM2 axis (140)
miR-13730 primary melanoma tissues and paired ANTsA375, SK-MEL-1, SK-MEL-5, HEMa-LP, HEMn-LPYesGLSPoor survival, TMN stageHas a tumor suppressive role. It inhibits proliferation and glutamine catabolism in melanoma cells via targeting glutaminase (141)
miR-137M17, M23, SP6.5, um95, HEK-293YesMITF, CDK6Its ectopic expression inhibits uveal melanoma cells proliferation and induces cell cycle arrest at G1 phase through downregulation of MITF and CDK6 (142)
miR-137Ma-Mel-79b, Ma-Mel-86bYesGLO1Its overexpression suppresses proliferation of melanoma cells by targeting GLO1 (143)
miR-137miR-137 expression data of 450 melanoma patients was obtained from TCGAWM1650, ME1402, MM200, WM1158YesTBX3Patient survivalInhibits melanoma cell migration and anchorage independent growth by targeting TBX3 (144)
miR-13730 melanoma tissues and 10 normal skin tissues, BALB/c female mice (A375 cell line was injected to mice)A2058, A375, A875, SKMEL5, TE353-SK, HacatYesAURKADecreases proliferation and colony formation ability of melanoma cells through targeting AURKA (145)
miR-13797 melanoma tissues and paired ANTsNoPatient survival, TNM stage, ulcer, occurrence siteIts low expression is associated with poor prognosis in melanoma patients. (146)
miR-137Ma-Mel-12, MaMel-20, Ma-Mel-37b, Ma-Mel-57, Ma-Mel-73a, Ma-Mel-79b, MaMel-86b, SK-Mel-2, SK-Mel5YesPAK2Suppresses proliferation of melanoma cells via inhibiting PAK2 (147)
miR-137WM278, A375, HEK293YesCtBP1Suppresses EMT process and induces apoptosis in melanoma cells through targeting CtBP1 (148)
miR-137melanoma cell lines established from metastasis of 33 patients with stage III or IV melanomaYesc-Met, YB1, EZH2, MITFPatient survivalInhibits cell proliferation, migration and invasion and induces apoptosis in melanoma cells via targeting c-Met, YB1, EZH2 and MITF (149)
miR-13715 melanoma tissues and 15 normal
pigmented nevus samples
HaCaT, SK‐MEL‐1, A375, WM451YesPIK3R3Represses migration and invasion of melanoma cells via targeting PIK3R3 (150)
miR−30a−5p22 malignant melanoma tissues and ANTs, BALB/c nude mice (A375 cell line was injected to mice)A375, SK-HEP-1, SK-MEL-1, MV3, HPMYesSOX4Inhibits melanoma cells proliferation, migration and invasion via targeting SOX4 (151)
miR-21810 primary melanoma tissues, 10 lymph node metastases and 10 benign nevi samplesA375, SK-MEL-2YesCIP2A, BMI1Inhibits proliferation, migration and invasion in melanoma cells by targeting CIP2A, BMI1 (152)
miR-605male 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-28YesINPP4BInhibits proliferation and growth of melanoma cells through suppression of INPP4B and consequently INPP4B-mediated negative regulation of SGK3 (153)
miR-24−1−5p77 malignant melanoma tissues and paired ANTsA375YesUBDJNK signaling pathwayIts overexpression gives rise to promotion of autophagy and apoptosis in melanoma cells via targeting UBD and activation of JNK signaling pathway (154)
miR-205-5p6 melanoma tissues and 6 skin nevus samplesHaCaT, A431, A375, A2058 and SK-MEL-2YesTNFAIP8Enhances apoptosis rate and sensitizes melanoma cells to vemurafenib through targeting TNFAIP8 (155)
miR-205-5p32 primary cutaneous melanoma tissues and 8 metastatic samplesNoDistant metastasisCan be a potential biomarker of distant metastases (156)
miR-145-5p
miR-203-3p
32 primary cutaneous melanoma tissues and 8 metastatic samplesNoBreslow thickness, high Clark level, ulceration, mitotic rateCan be potential markers of aggressiveness in melanoma (156)
miR-20510 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, 293TYesIts enforced expression reduces migration, motility and proliferation of melanoma cells (157)
miR-20520 primary melanoma tissues, 27 metastatic melanoma tissues and 20 benign neviWM3211, DO4, WM278, 1205-Lu, C8161.9, Normal human melanocytesYesE2F1, E2F5AKT signaling pathwayIts overexpression suppresses proliferation and colony formation and induces apoptosis in melanoma cell via targeting E2F1 ()
miR-20565 primary melanoma tissues and 67 melanoma metastasesA375, SKMEL-147, 451 LuNoZEB1Patient survival, Breslow thickness, ulceration, Mitosis/mm2, growth phase, Histological typeInfluences invasive ability of melanoma cells and can be a potential prognostic biomarker (125)
miR-2055 high-invasive uveal melanoma tissues, 5 low-invasive uveal melanoma tissues and 5 healthy controlsOCM-1A, C918, 293TYesNRP1Its overexpression represses proliferation and invasion of melanoma cells via targeting NRP1 (158)
miR-145-5p83 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, NHEMYesNRASMAPK and PI3K/AKT signaling pathwaysTumor thickness, NRAS mutation, tumor stageIts high expression inhibit proliferation, migration and invasion and promotes apoptosis in VMM917 and CHL-1 melanoma cells through targeting NRAS (159)
miR-145-5p55 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
YesTLR4NF-κB signaling pathwaySuppresses proliferation, migration and invasion of melanoma cell via targeting TLR4 (160)
miR-145-5p12 uveal melanoma tissues and 12 normal uveal tissuesOCM-1, MUM- 2BYesN-RAS, VEGFInhibits tumor growth, angiogenesis and invasion of uveal melanoma cells through targeting N-RAS and VEGF (161)
miR-195341 matched mRNA-Seq and miRNA-Seq tumor samples, along with one normal sample for each data set were obtained from TCGASK-MEL-5, SK-MEL-19, SK-MEL-37, SK-MEL-147, UACC-62, WM35, WM793B, WM1366, WM1552C, WM1617, Lox10, MZ2Mel, HaCat, NGMYesPHB1Its upregulation results in decreased cell proliferation and high cytotoxic effects of cisplatin and temozolomide on melanoma cells (162)
miR-211Male BALB/c nude mice (SK-MEL-28 cell line was injected)A375, SK-MEL-28YesPoor prognosis, tumor thickness, AJCC stageIts upregulation sensitizes melanoma cells to cisplatin and increases cisplatin anticancer effect (163)
miR-211A375, WM1552C, HEM-lYesPDK4Acts as a metabolic switch and sensitizes melanoma cells to hypoxia through targeting PDK4 (164)
miR-2116 primary melanoma tissues and 24 melanoma metastasesHEM-l, A375, G361, LOX-IMV1, HT-144, RPMI-7951, SK-MEL2, SK-MEL28, WM793B, WM1552C,YesKCNMA1Its overexpression reduces growth and invasion of melanoma cells via targeting KCNMA1 (165)
miR-211HM, WM115, A375, SK-MEL-1YesRAB22ARegulates EMT process through targeting RAB22A (166)
miR-211HMV-I, HMV-II,
G-361, SK-MEL-28, NHEM-L, NHEM-M, NHEM-D, MM-EP, MM-RU, MM-WK, HEK-293
YesPRAMERegulates PRAME expression in melanoma cells its overexpression cause reduction in PRAME expression (167)
miR-21161 melanoma cell lines (some of them include: A2–A15, D4–D25, ME1007, ME1402, ME4405, ME10538, Mel-FH, Mel-RM, Mel-RMU, MM470, MM537, MM629)YesBRN2Changes invasion capacity of melanoma cells through targeting BRN2 (168)
miR-211miRNA expression was derived for eleven melanoma cell lines and matched to samples obtained from GEOWM3526, WM3682, 451LUYesNUAK1Its upregulation inhibits invasion and restores adhesion through targeting NUAK1 (169)
miR-21152 cutaneous melanoma tissues, 41 uveal melanoma tissues and 35 normal skin specimensG361, GR-M, OCM-1YesIL-10RαIts ectopic expression decreases proliferation of all melanoma cell lines through targeting IL-10Rα (95)
miR-211A375M, UACC62, HeLaYesIGF2R, TGFBR2, NFAT5Its overexpression inhibits migration and invasion of invasive melanoma cells (170)
miR-181a10 melanoma tissues and paired ANTsWM266-4, A2058YesBcl-2Is upregulated by Piceatannol treatment and contributes to anticancer role of piceatannol through targeting Bcl-2 (171)
miR-18117 matched melanoma tissues before and after resistance of patients to BRAF inhibitorsA375, M14YesTFAMPatient survivalIts overexpression impedes melanoma growth and alleviates resistance to dabrafenib through targeting TFAM (172)
miR-37524 melanoma tissues, normal skin and nevi samplesHEM‐l, HEK, WM793B, WM278, WM1552CYesIts ectopic expression suppresses proliferation invasion, and cell motility and induces changes in cell shape in melanoma cells (173)
miR-328HEM, SK-MEL-1, A375YesTGFB2Its overexpression represses proliferation and induces cell cycle arrest at G1 phase (174)
miR-4633-5p56 Primary human sinonasal mucosal melanoma tissuesA375, M435SYesAkt pathwayMetastasisInhibits cell growth, invasion and secretion of MMP2 in melanoma (175)
miR-45520 melanoma tissues and paired ANTsSKMEL1, A375, HT144, A2058, HEK293TYesIGF−1RSuppresses proliferation and invasion in melanoma cells via targeting IGF1R (176)
miR-1455 high-invasive uveal melanoma tissues, 5 low-invasive uveal melanoma tissues and 5 healthy controlsOCM-1A, C918, 293TYesNRP1Represses proliferation and invasion of melanoma cells via targeting NRP1 (158)
miR-14533 oral canine malignant melanoma tissues and 11 canine normal oral mucosa tissues,KMeC,
LMeC, CMeC-1, CMeC-2, A2058,
Mewo, HEM
Yesc-MYC, FASCIN1Inhibits proliferation and migration in melanoma cells through suppression of c-MYC and FASCIN1 (177)
miR-14511 uveal melanoma tissues and 12 normal controlsMUM-2B, OCM-1YesIRS-1Inhibits cell proliferation through blocking G1/S transition and induces apoptosis in uveal melanoma cells via targeting IRS-1 (178)
miR-145BLM, FM3P, WM793YesIts overexpression inhibits migration and invasion in metastatic melanoma cells (179)
miR-219-5p42 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-LPYesBcl-2Overall survival, TNM stage, distant metastasisReduces proliferation, migration and invasion and promotes apoptosis in melanoma cells by targeting Bcl-2 (180)
miR-319 primary melanoma tissues, 71 metastatic melanoma and 2 dysplastic neviSK-Mel5, SK-Mel28, MM603YesSRC, MET, NIK, RAB27aHas tumor suppressive role and its ectopic expression inhibits migration and invasion in melanoma cells (181)
miR-31Fifteen patient-derived primary cultures of melanoma, SCID-NOD mice (HAG cell line was injected to mice)C8161 (HAG), C81-61 (PAG)YesSuppresses proliferation, invasion and tube formation in melanoma cells (93)
miR-124a6 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, um95YesCDK4, CDK6, cyclin D2, EZH2Has a tumor suppressive role and represses proliferation, migration and invasion in uveal melanoma cells (182)
miR-124107 melanoma tissues and paired ANTsHEM, SK-MEL-1, A375YesRLIP76TNM stageSuppresses melanoma cells proliferation and invasion and induces apoptosis by targeting RLIP76 (183)
miR-12468 melanoma tissues and paired ANTsB16, A375, HACATYesVersicanTumor thickness, clinical stage, lymph node involvementInhibits proliferation, migration and invasion of melanoma cells through targeting Versican (184)
miR-206serum samples from 60 melanoma patients and 30 healthy controlsNoPoor prognosis, response to treatment, clinical stageMay be implicated in melanoma progression an can be a potential prognostic factor (185)
miR-20636 melanoma tissues and 16
Healthy control tissues
A375, MALME-3M, RPMI7951, SKMEL-2, SK-MEL-5, NHEM-Ad-AdultYesCDK4, Cyclin D1, Cyclin CReduces proliferation, migration and invasion and induces cell cycle arrest at G1 phase in melanoma cells (186)
miR-186SK-MEL-1, G-361, A375, A875, HEMn-LPYesInhibits proliferation, migration and invasion in melanoma cells (187)
miR-26b59 melanoma tissues and ANTsHEK293, B16F10, B16F0, A375, HMCB, Hs695TYesTRAF5MAPK pathwayReduces cell growth and induces apoptosis in melanoma cells by targeting TRAF5 (188)
miR-196a3 primary melanoma tissues and 5 melanoma metastasesMel Ei, Mel Wei, Mel Juso, Mel Im, Mel Ju, HMB2, SkMel 3, SkMel 28, NHEMYesHOX-C8Decreases invasion in melanoma cells through suppression of HOX-C8 expression (189)
miR-196aMel Ei, Mel Wei, Mel Ho, Mel Juso, Mel Ju, SkMel 28, SkMel 3, NHEMYesHOX-B7Regulates migration of melanoma cells through influencing miR-196a/HOX-B7/Ets-1/bFGF/BMP4 axis (190)
miR-193bFFPE specimens of 8 benign nevi, and 8 metastatic melanomasMalme-3M, SKMEL-28, SKMEL-5YesCCND1Suppresses proliferation and cell cycle arrest at G1 phase in melanoma cells through downregulation of CCND1 (191)
miR-193bFFPE tissue specimens of 8 benign nevi, 8 metastatic melanoma and 15 primary melanoma tissuesMalme-3M, MeWo, SK-MEL-2, SK-MEL-28YesMcl-1Sensitizes melanoma cells to ABT-737 and regulates expression of Mcl-1 (192)
miR-200c10 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, 293TYesBMI-1Inhibits proliferation, migration and metastasis of melanoma cells via suppression of BMI-1 expression (193)
miR-200c65 primary melanoma tissues and 67 melanoma metastasesA375, SKMEL-147, 451 LuNoPatient survival, Breslow thickness, ulceration, Mitosis/mm2, growth phase, location, histological typeCan be potential prognostic biomarker (125)
miR-200aParaffin-embedded archival tissue specimens of 7 primary melanoma, 33 lymph node metastasis, 25 distant organ metastasis and 10 benign neviMELANO, MEL 2183, COLO 829YesCDK6Inhibits proliferation and induces cell cycle arrest in melanoma cells through targeting CDK6 (194)
miR-200a46 melanoma tissues and paired ANTsA375, SK-HEP-1, WM35, SK-MEL-28YesGOLM1PI3K/Akt signaling pathwayOverall survival, tumor thickness, TNM stageInhibits proliferation, migration and invasion of melanoma cells via targeting GOLM1 and regulation of PI3K/Akt signaling pathway (195)
miR-15525 uveal melanoma tissues and ANTsOCM-1A, MUM-2C, C918, MUM-2B, D78YesNDFIP1Enhances proliferation and invasion of uveal melanoma cells via targeting (196)
miR-155SK-Mel-28, WM-266-4, GL-Me, 397-Mel, CH-Mel, DR-Mel, SN-Mel,YesSKIInhibits melanoma cells proliferation through targeting SKI (197)
miR-155CG-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 melanocytesYesIts ectopic expression represses proliferation and induces apoptosis in melanoma cells ()
miR-15560 melanoma tissues and paired ANTsA375, SKMEL-28, A2058, HEMYesCBLtumor thickness, TNM stage, lymph node metastasisSuppresses proliferation, migration and invasion of melanoma cells via targeting CBL (198)
miR-18b92 primary melanoma tissues and 48 benign nevi samples, 20 nude mice (1205-Lu cell line was injected to mice)1205-Lu, DO4, WM3211, WM278YesMDM2p53 signaling pathwayOverall survivalReduces proliferation, migration and invasion and induces apoptosis in melanoma cell through downregulation of MDM2 (199)
miR-18b68 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, HACATYesHIF-1αtumor thickness, tumor stageInhibits glycolysis and cell proliferation and induces cell cycles arrest in melanoma cells through targeting HIF-1α (200)
miR-26aSK-MEL-28, HT-144, HEK293, HEMNLP, HEMNLP2, WM278, WM852c, 1205Lu, A375, RPMI7951YesSODDDecreases cell viability and induces apoptosis in melanoma cells through targeting SODD. (201)
miR-26aA2058, A375, SK-MEL-5, SK-MEL-28YesLin28B, Zcchc11Increases microRNA synthesis by targeting Lin28B and Zcchc11 to inhibit tumor growth and metastasis (202)
miR-26amale C57BL/6 mice (B16-F10 cell line was injected to mice)WM1552C, SKMEL-28, B16-F10YesMITFInhibits proliferation and invasion of melanoma cells via targeting MITF (203)
miR-910 primary melanoma tissues and 10 metastasesWM35, WM793, WM115A, 1205Lu, 293TYesNF-κB1NF-κB1-Snail1 signaling pathwayReduces proliferation and migration of melanoma cells through regulation of NF-κB1-Snail1 pathway. (204)
miR-924 melanoma tissues and 14 benign nevi samplesWM852, WM1791C, WM8, FO-1, WM983A, WM793, Daju, WM209YesRYBPSuppresses proliferation migration and invasion in melanoma cells through targeting RYBP (205)
miR-9MUM-2B, C918, MUM-2C, OCM-1AYesNF-κB1NF-κB1 signaling pathwaySuppresses migration and invasion of uveal melanoma cells via targeting cells NF-κB1 and downregulation of the NF-κB1 signaling pathway (206)
miR-973 melanoma tissues and paired ANTs, Male BALB/C-nu/nu nude mice (A375 cell line was injected to mice)HACAT, G361, B16, A375, HME1YesNRP1tumor stage, lymph node metastasisDecreases melanoma cells proliferation, migration and invasion of through targeting NRP1. (207)
miR-924 primary melanoma tissues and paired ANTsB16, A375, G361, HME1, HACAT, HEK293YesSIRT1Inhibits proliferation and migration of melanoma cells partly through targeting SIRT1 (208)
let-7b10 primary melanoma tissues and 10 benign melanocytic neviSK-Mel-147, G361Yescyclin D1, cyclin D3, cyclin A, Cdk-4Suppresses progression of cell cycle and anchorage-independent growth in melanoma (85)
let-7b16 melanoma tissues and 8 normal
tissues
s SK-mel-28, A375, A2058, HaCaTYesUHRF1Suppresses proliferation of melanoma cell by targeting UHRF1 (209)
let-7bOCM1, OM431Yescyclin D1Sensitizes radioresistance uveal melanoma cells to radiotherapy by targeting cyclin D1 (210)
let-7b106 mucosal melanoma tissues, mucosal nevi Female NOD/SCID (HMVII cell line was injected to mice)HMVII, GAK, 293TYesMTDH, CALUPatient survival, ECOG scoreSuppresses melanoma cells proliferation, migration, invasion and induces apoptosis through targeting MTDH and CALU (211)
let-7c106 mucosal melanoma tissues, mucosal nevi Female NOD/SCID (HMVII cell line was injected to mice)HMVII, GAK, 293TYesMTDH, CALUPatient survival, ECOG scoreSuppresses melanoma cells proliferation, migration, invasion and induces apoptosis through targeting MTDH and CALU (211)
let-7aMel Im, Mel Wei, Mel Juso, Mel Ei, Mel Ho, Mel Ju, HMB2, SK-Mel 28Yesintegrin β3Its overexpression decreases invasive ability of melanoma cells through downregulation of integrin β3 (86)
miR-330-3p77 melanoma tissues and 38 Normal skin tissues,SK-MEL-2, UACC903YesTPX2Suppresses proliferation of melanoma cells through negative regulation of TPX2 (212)
miR-330-5p26 primary melanoma tissues and 26 matched non-tumor tissuesHEMn-LP, A375, A875YesTYR, PDIA3Represses proliferation, migration and invasion of melanoma cells via suppression of TYR and PDIA3 expression (213)
miR-18330 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, HEK293TYesITGB1ITGB1 signaling pathwayPoor prognosis, advanced pathological stageSuppresses proliferation of melanoma cells through targeting ITGB1 (214)
miR-1445 uveal melanoma tissues and 5 uveal normal tissuesMUM-2B, C918, MUM-2C, OCM-1A, D78Yesc-MetInhibit proliferation and migration in uveal melanoma cells via targeting c-Met (215)
miR-14426 uveal melanoma tissues and normal choroid samplesMEL270, OMM2.5, UPMM3, UPMM2YesADAM10, c-MetSuppresses proliferation, migration and cell cycle progression in melanoma cells through targeting ADAM10 and c-Met (216)
miR-12226 uveal melanoma tissues and normal choroid samplesMEL270, OMM2.5, UPMM3, UPMM2YesADAM10, c-MetSuppresses proliferation, migration and cell cycle progression in melanoma cells through targeting ADAM10 and c-Met (216)
miR-10715 primary melanoma tissues, 15 melanoma metastases and 15 nevi samplesSK-MEL-1, A375, G-361, SK0MEL-3, SH-4, SK-MEL-24YesPOU3F2late stageDecreases proliferation, migration and invasion in melanoma cells (217)
miR-296-3p18 choroidal malignant melanoma tissues and 6 normal choroidal tissuesC918,YesMMP−2, MMP−9Suppresses proliferation, migration and invasion and stimulates apoptosis (218)
miR-542-3p24 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, B16F10YesPIM1Inhibits migration, invasion and EMT process in melanoma cells via targeting PIM1 (219)
miR-625‐5pPrimary melanoma tissues and normal tissuesA2085, A375, A875, Mel‐RM,
M14, M21, WM35, HFE
YesPKM2TNM stage, tumor size, poor differentiationInhibits melanoma cells proliferation and glycolysis and sensitizes these cell to BRAF inhibitor via targeting PKM2 (220)
miR-339-3pNSG mice (A375 cell line was injected to mice)A375, WM266.4, WM115YesMCL1Reduces invasive ability and metastasis in melanoma cells through targeting MCL1 (221)
miR-590-5pfemale athymic Balb/C nude mice (A2058 cell line was injected to mice)A2058, A375, HEMa-LP, 293, HMYesYAP1Reduces proliferation and induces apoptosis in melanoma cells via downregulation of YAP1 (222)
miR-768-3pMM200, Mel-CV, IgR3, Mel-RMu, Sk-Mel-28, Me1007, Mel-JD, Mel-FH, Me4405, Mel-RM, HEMn-MP, HEMn-DPYeseIF4ESuppresses cell proliferation and survival and reduces nascent protein synthesis in melanoma cells through targeting eIF4E (223)
miR-451a.1105 melanoma tissues and 101 normal skin tissuesA2058, A375P, C32, A375SM, WM983A, WM278, WM35, WM1552CYesCAB39Inhibits migration and invasion of melanoma cells (this effect is not mediated by CAB39) (224)
miR-32Genetically engineered mice (Mice carrying an HGF/SF transgene) (A375P cell line was injected to mice)WM3928, A375P, YUGEN8YesMCL-1MAPK pathwayDecreases tumorigenicity and induces apoptosis in melanoma cells via targeting MCL-1 (225)
miR-49352 melanoma tissues and paired ANTsPEM, SK-MEL-28, WM-115, UACC257, A375, A7, MeWo, NHEMYesIRS4Suppresses proliferation and cell cycle progression in melanoma cells through targeting IRS4 (226)
miR-382211 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-28YesCTTN, RAC1, ARPC2Tumor thickness, recurrence-free survivalInhibits tumor metastasis, invasion and matrix degradation through targeting CTTN, RAC1 and ARPC2 (227)
miR-516b211 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-28YesTumor thicknessSuppresses tumor growth and metastasis (227)
miR-19460 melanoma tissues and paired ANTsA375, A875YesGEF-H1TNM stagesInhibits proliferation and metastasis of melanoma cells through suppression of GEF-H1/RhoA pathway (228)
miR-19424 melanoma tissues and paired ANTs,SK-Mel2,YesPI3K/AKT/FoxO3a and p53/p21 signaling pathwaysPatient survivalInhibits cell proliferation and induces apoptosis through regulation of PI3K/AKT/FoxO3a and p53/p21 signaling pathways (229)
miR-12814 primary cutaneous melanoma tissues and ANTsA375,YesCCL18Inhibits migration and colony formation ability and promotes apoptosis in melanoma cells through targeting CL18 (230)
miR-128037 melanoma tissues and 24 benign nevi samplesA375, Mamel66a, Mamel103b, 1205-Lu, C8161.9YesSrcSuppresses proliferation, cell cycle progression and invasion and promotes apoptosis in melanoma cells via targeting Src (231)
miR-57311 melanoma tissues and paired ANTs, BABL/c nude mice (A375, SK-MEL-2 cell lines were injected to mice)A375, SK-MEL-2YesMCAMSuppresses proliferation and invasion of melanoma cells via targeting MCAM (232)
miR-33a-5p29 melanoma tissues and ANTs, nude mice (SKMEL-28 cell line was injected to mice)SKMEL-28, A375, WM35, SKMEL-1, PIG1YesSNAI2PI3K/AKT/mTOR signaling pathwayLymph node metastasis, tumor size, STM stageSuppresses proliferation, migration and invasion and induces apoptosis in melanoma cell through targeting SNAI2 (233)
miR-33a-5p20 melanoma and match nevus tissuesA375, WM35, WM451, SK-MEL-1, HMYesReduces proliferation and promotes radiosensitivity by suppressing glycolysis in melanoma cells (234)
miR-33aMale BALB/C-nu/nu mice (A375 cell line was injected to mice)WM35, WM451, A375, SK-MEL-1, HMYesHIF-1αInhibits proliferation, invasion and metastasis in melanoma cells via targeting HIF-1α (235)
miR-33aSK-MEL-1, WM-115, PEMI, PEM2YesPCTAIRE1Suppresses proliferation and colony formation ability of melanoma cells through targeting PCTAIRE1 (236)
miR-33bWM35, WM451, SK-MEL-1, HM, HEK293YesHIF-1αSuppresses melanoma cells proliferation and glycolysis through targeting HIF-1α (237)
miR-9820 melanoma tissues and 20 normal nevi, 80 male mice (B16-F1 cell line was injected to mice)B16-F1YesIL-6Patient survival, tumor stageSuppresses migration and metastasis of melanoma cell through miR-98-IL-6-negative feedback loop (238)
miR-425Melanoma tissues and normal tissuesA375, SK-MEL-28, UACC257, WM-115, NHEMYesIGF-1PI3K-Akt signaling pathwaySuppresses proliferation and metastasis of melanoma cell via targeting IGF-1 and inhibition of PI3K-Akt signaling pathway (239)
miR-33740 melanoma tissues and paired ANTsHEK293, A375, A875YesSTAT3Patient prognosisSuppresses growth and metastasis in melanoma cells via targeting STAT3 (240)
miR-63761 melanoma tissues and ANTsA375, SK-MEL-28, Mel-RM, HaCaTYesP-REX2aPTEN/AKT signaling pathwaylymph node
metastasis, TNM stage
Inhibits proliferation and G1-S transition in melanoma cells through targeting P-REX2a (241)
miR-32936 paraffin‐embedded melanoma tissues and 10 pigmented nevi samplesPEM, WM‐115, A375, A7, UACC257YesHMGB2β‐catenin signaling pathwaySuppresses proliferation, migration and invasion and promotes apoptosis in melanoma cell through negative regulation of HMGB2 (242)
miR-579-3pFFPE 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 treatmentM14, LOX IMVI, COLO 38, MALME-3M, SKMEL5, WM115, WM266, M229, HEK-293YesBRAF, MDM2Inhibits growth and migration of melanoma cells, induces apoptosis and impairs drug resistance in melanoma (243)
miR-101HEK293T, NHEM, 29 melanoma cell lines established from metastases of melanoma patientsYesMITF, EZH2Patient survivalSuppresses proliferation, migration and invasion of melanoma cells through targeting MITF and EZH2 (244)
miR-6649 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, PEMYesPLP2Patient survivalDecreases proliferation and tumorigenicity of melanoma cells through targeting PLP2 (245)
miR-29aHACAT, HFF, A375, Malme-3M, SK-MEL-2, SK-MEL-5, M14YesBmi1Wnt/β-catenin and NF-κB signaling pathwaysSuppresses cell growth, migration and invasion in melanoma cells and induces apoptosis by targeting Bmi1 (246)
miR-524-5pmale NOD/SCID mice (SK-Mel-19 cell line was injected to mice)HEK293, Malme-3M, Malme-3, A375, SK-Mel-19YesBRAF, ERK2MAPK/ERK signaling pathwayInhibits proliferation and migration of melanoma cells through targeting BRAF and ERK2 and inhibition of MAPK/ERK signaling pathway (247)
miR-138Whole blood samples from 5 melanoma patients and 6 healthy controlsA2058YesPI3K/AKT/mTOR signaling pathwayPatient survivalSuppresses cell proliferation and induces apoptosis in melanoma cells via inhibition of PI3K/AKT/mTOR signaling pathway (248)
miR-138WM451, HMYesHIF-1αInhibits melanoma cells proliferation, invasion and glycolysis through targeting HIF-1α (249)
miR-13816 melanoma tissues and 16 precancerous tissues, female mice (WM35 and A375 cell lines were injected to mice)WM35, A375, HEK293YesHIF1αInhibits proliferation, migration and invasion and promotes apoptosis in melanoma cells through targeting HIF1α (250)
miR-126108 primary cutaneous melanoma tissues, 18 melanoma metastases and 16 dysplastic nevi samplesNoPatient survival, Breslow thickness, tumor ulceration, tumor stageCan 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,YesADAM9, MMP7Decrease proliferation, invasion and chemotaxis of melanoma cells through targeting ADAM9 and MMP7 (252)
miR-377FFPE tissues samples of 6 primary cutaneous melanoma and 13 benign nevimel33B1, mel-14PA, mel-15AY, mel-526, mel-624, NHEMYesE2F3, MAP3K7MAP3K7/NF-kB signaling pathwayDecreases proliferative ability and colony-forming capability in melanoma cells (253)
miR-139-5p82 malignant melanoma tissues and 30 benign
skin disease tissues from healthy controls
PIG1, A375, SK-MEL-1, SKMEL-2, SK-MEL-5, SK-MEL-28YesIGF1RPI3K/AKT signaling pathwayInhibits cell proliferation, migration and invasion and promotes apoptosis through targeting IGF1R (254)
miR-34227 melanoma tissues and paired ANTsHEM, A375, A2058, SK-MEL-28, HT144YesZEB1Inhibits proliferation and invasion of melanoma cells through targeting ZEB1 (255)
miR-12740 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-LpYesDLK1Overall survival, tumor thickness, tumor stageSuppresses cell proliferation and induces apoptosis through downregulation of DLK1 (256)
miR-2248 melanoma tissues and paired ANTs, nude mice (A375 cell line was injected to mice)HEM, A375, SK-MEL-1, WM35, SK-MEL-28YesFMNL2Wnt/β-Catenin Signaling PathwayOverall survival, tumor thickness, TNM stageSuppresses proliferation, migration and invasion of melanoma cells through targeting FMNL2 (257)
miR-3065-5p12 primary melanoma and 9 benign melanocytic tumorsBRO, SK-MEL1YesHIPK1, ITGA1Induces cell cycle arrest at G1 phases and inhibits migration of melanoma cells (258)
miR-204-5p12 primary melanoma and 9 benign melanocytic tumorsBRO, SK-MEL1YesDecreases proliferation, invasion and colony formation ability of melanoma cells (258)
miR-204-5p30 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-2YesMMP9, BCL2Overall survivalInhibits proliferation, migration and invasion and induces apoptosis in melanoma cells through targeting MMP9 and BCL2 (259)
miR-610105 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, HPMYesLRP6Patient survival, tumor stage, tumor thicknessRepresses cell proliferation, cell cycle progression and induces apoptosis in melanoma cells by targeting LRP6 (260)
miR-366280 melanoma tissues and paired ANTs, BALB/c nude mice (A375 and OCM-1A cell lines were injected to mice)A375, OCM-1AYesZEB1Inhibits invasion and EMT process in melanoma cell via targeting ZEB1 (261)
miR-33122 melanoma tissues and paired ANTsHEM, A375, A2058, HT144, SK-MEL-1, SK-MEL-28YesAEG-1PTEN/AKT signaling pathwaySuppresses proliferation and invasion of melanoma cells through targeting AEG-1 (262)
miR-149-5pMelanoma tissues and ANTsA2058, A375, HSC-1, SK-37, SKMLE-1, WM451, HaCaTYesLRIG2Reduces proliferation, colony formation and induces apoptosis in melanoma cells through targeting LRIG2 (263)
miR-338-3p60 melanoma tissues and paired ANTs,A375, G361YesMACC1clinical stage, lymph node metastasisInhibits proliferation, migration and invasion in melanoma cells through targeting MACC1 (264)
miR-4458A375, A2058, SK-MEL-28, SK-MEL-2, HEMa-LPYesPBX3Represses proliferation, migration and induces apoptosis in melanoma cells via targeting PBX3 (265)
miR-489-3pnude mice (A375 cell line was injected to mice)A375, SK-MEL-2YesSIX1Inhibits proliferation, migration and invasion of melanoma cells and regulates glycolysis through targeting SIX1 (266)
miR-431113 melanoma tissues and paired ANTsA875, HBL, 1205Lu, A375, SK-MEL-1, HEMa-LP, CHL-1YesNOTCH2Overall survival, tumor stage, ulcerationSuppresses cell proliferation, migration and invasion and induces apoptosis in melanoma cells through targeting NOTCH2 (267)
miR-13418 melanoma tissues and paired ANTsBT549, MB-231, MB-486, MCF7, SK-BR-3, 293TYesCTHCR1Decreases proliferation, migration, invasion and induces cell cycle arrest and apoptosis in melanoma cells through downregulation of CTHCR1 (268)
miR-224-5p30 uveal melanoma tissues and paired ANTsOCM‐1A, HEK 293TYesPIK3R3, AKT3Suppresses proliferation, migration and invasion of melanoma cells via targeting PIK3R3 and AKT3 (269)
miR-140-5p25 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
YesSOX4Wnt/β‐catenin and NF‐κB signaling pathwaysclinical stageIts overexpression inhibits proliferation and invasion of melanoma cells by targeting SOX4 and inactivation of Wnt/β-catenin and NF‐κB signaling pathways (270)
miR-140-3p25 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, HPMYesABHD2JNK and AKT/p70S6K Signaling PathwayOverall survivalBlocks proliferation, migration and invasion and induces apoptosis in melanoma cell through targeting ABHD2 (271)
miR-135b27 melanoma tissues and 27 normal skin tissuesA375, PEMYesRBX1Suppresses 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 (). Worley et al. have used a high throughput technique to identify the miRNAs whose expression profile could predict the metastatic potential of uveal melanomas. Their approach led to identification of let-7b and miR-199a as the most robust discriminators. Notably, expression profile of six miRNAs could differentiate low and high risk groups with optimal sensitivity and specificity values (274). Table 3 shows the role of miRNAs in the prediction of prognosis of melanoma using Kaplan-Meier or Cox regression analyses.

Table 3

microRNASample numberKaplan-Meier analysisUnivariate cox regressionMultivariate cox regressionReference
miR-10b79 primary melanoma tissues and 32 metastasesIs a potential prognostic biomarker associated with metastasisCan be an independent potential prognostic factor ()
miR-10b78 melanoma tissues and 30 non-tumor skin samplesIts high expression is associated with poor OS in melanoma patients. ()
miR-10bBlood samples from 85 melanoma patients and 30 healthy volunteersIts 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-30d109 primary melanoma tissues and 17 melanoma metastasesIts high expression is associated with poor OS.Its expression pattern is an independent prognostic factor for melanoma mortality. (65)
miR-30b109 primary melanoma tissues and 17 melanoma metastasesIts high expression is associated with poor OS. (65)
miR-92a75 melanoma tissues and paired ANTsIts high expression is associated with poor OS. (75)
miR-59636 melanomas samples and 22 neviIts low expression was associated with significantly shorter OS. (126)
miRNA-29c30 malignant melanoma tissues and 10 paracancer tissuesIts low expression associated with poor prognosis. (128)
miR-36540 melanoma tissues and paired ANTsIts low expression associated with shorter OS and RFS. (97)
miR-13730 primary melanoma tissues and paired ANTsIts low expression associated with poor survival.Can be an independent risk factor of OS (141)
miR-13797 melanoma tissues and paired ANTsIts 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 tissuesTheir low expression associated with poor survival. (118)
miR-2186 primary cutaneous melanomas tissues, 10 melanoma metastases, 10 dysplastic nevi samplesIts 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-2112 FFPE primary melanoma tissues and 12 melanocytic neviIts high expression is associated with poor RFS and OS. ()
miR-18117 matched melanoma tissues before and after resistance of patients to BRAF inhibitorsIts low expression is correlated with low progression free survival (PFS) and OS (172)
miR-4633-5p56 Primary human sinonasal mucosal melanoma tissuesIts expression pattern can be a prognostic factor in identifying metastatic sinonasal mucosal melanoma.It can be an independent prognostic factor for metastasis. (175)
miR-19132 lymph node metastasesIts low expression associated with poor melanoma-specific survival. (276)
miR-193b32 lymph node metastasesIts 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 BrowserTheir 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 neviThis signature can estimate post-recurrence survival.This miRNA signature is an independent predictor of post-recurrence survival in metastatic melanoma. (278)
miR-338-5p46 melanoma tissues and 25 normal nevi samplesIts high expression is associated with decreased OS.Its expression correlates to patient survivalIt can be an independent prognostic factor for OS. (48)
miR-203148 melanoma tissues and paired ANTsIts low expression is associated with poor OS.It can be an independent prognostic marker for melanoma patients. (136)
miR-29c149 melanoma tissues with AJCC stage I–IVIts low expression is associated with poor DFS and OS in stage III melanoma patients.Its expression correlates to DFS and OSIts expression is significantly correlated to OS but not DFS. (279)
miR-206serum samples from 60 melanoma patients and 30 healthy controlsIts low serum levels is associated with poor DFS and OS.Its serum level is independent prognostic factors for DFS and OS. (185)
miR-18b92 primary melanoma tissues and 48 benign nevi samplesIts low expression is associated with shorter OS. (199)
miR-15b128 FFPE tissues of primary melanomas and 11 melanocytic nevi samplesIts high expression is associated with RFS and OS.Its expression pattern can be an independent prognostic factor for DFS and OS. (50)
miR-18330 melanoma tissues and 14 normal skin samplesIts low expression is associated with poor OS. (214)
miR-23aSerum samples from 192 melanoma patients and 51 matched cancer-free controlsIts 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-23b114 primary melanoma tissues and ANTsIts low expression is associated with short 3-year survival in melanoma patients. (107)
miR-216a-5p86 uveal melanoma tissuesIts low expression is associated with poor DFS and OS. (115)
miR-221Serum samples from 72 cutaneous malignant melanoma and 54 healthy controlsIts high expression is associated with poor RFS and OS.Its expression can be an independent predictor of DFS and OS (55)
miR-205319 melanoma tissue samplesIts low expression is associated with short MMS in melanoma patients.Its expression can be a predictor of MMSIts expression pattern can be an independent prognostic marker for MMS (280)
miR-20565 primary melanoma tissues and 67 melanoma metastasesIts low expression is associated with shorter DMFS and MSS.Its expression pattern can be an independent prognostic factor of MMS (125)
miR-200c65 primary melanoma tissues and 67 melanoma metastasesIts low expression is associated with shorter DMFS and MSS.Its expression pattern can be an independent prognostic factor of survival (125)
miR-200a46 melanoma tissues and paired ANTsIts low expression is associated with poor OS. (195)
miR-12565 primary melanoma tissues and 67 melanoma metastasesIts low expression is associated with shorter DMFS and MSS.Its expression pattern can be an independent prognostic factor of survival (125)
miR-15051 melanoma tissues and paired ANTsIts low expression is associated with short RFS and OS. (117)
let-7b106 mucosal melanoma tissues, mucosal nevi samplesIts low expression is associated with poor DFS.Its expression level correlates with DFS in melanoma patientsIts expression pattern is an independent prognostic marker for DFS (211)
let-7c106 mucosal melanoma tissues, mucosal nevi samplesIts low expression is associated with poor DFS.Its expression level correlates with DFS in melanoma patientsIts expression pattern is an independent prognostic marker for DFS (211)
miR-126108 primary cutaneous melanoma tissues, 18 melanoma metastases and 16 dysplastic nevi samplesIts low expression is associated with poor OS in melanoma patientsCan be an independent prognostic factor for overall survival (251)
miR-12740 melanoma tissues and paired ANTsIts low expression is associated with short OS (256)
miR-2248 melanoma tissues and paired ANTsIts low expression is associated with shorter OS (257)
miR-610105 melanoma tissues and ANTsIts low expression is associated with short 5-year survival (260)
miR-431113 melanoma tissues and paired ANTsIts low expression is associated with poor OS in melanoma patientsCan be a potential prognostic marker for melanoma patientsCan be an independent prognostic factor for melanoma patients (267)
miR-140-3p25 melanoma tissues and paired ANTsIts low is associated with poor OSIts expression pattern correlates with OS in melanoma patientsIts expression pattern is an independent prognostic factor for OS in melanoma patients (271)
miR-125b29 FFPE melanoma specimens and 16 intradermal nevus specimensIts low expression is associated with short OSIts 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

microRNAExpression patternSampleDiagnostic biomarkerROC curve analysisReference
SensitivitySpecificityArea 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 samplesDiagnostic (diagnosis of presence of melanoma)93%≥ 82% ()
miR-211-5pDownregulatedTissue samplesDiagnostic (invasive melanoma)0.933 (282)
Tissue samplesDiagnostic
(melanoma in situ)
0.933
Tissue samplesDiagnostic
(dysplastic nevi)
0.951
miR-211DownregulatedTissue samplesDiagnostic (discriminating melanomas from nevi)90%86.2%0.862 (283)
miR-532-5p
miR-106b
-
-
Serum exosomesDiagnostic (distinguishing melanoma patients from healthy individuals)0.936 (284)
miR-15b-5pUpregulatedPlasma samplesDiagnostic (diagnosis of cutaneous melanoma)90.0%0.80 (285)
miR-150-5pUpregulatedPlasma samplesDiagnostic (diagnosis of cutaneous melanoma)96.7%0.94
miR-149-3pUpregulatedPlasma samplesDiagnostic (diagnosis of cutaneous melanoma)93.3%0.95
miR-193a-3pDownregulatedPlasma samplesDiagnostic (diagnosis of cutaneous melanoma)76.70.84
miR-524-5pDownregulatedPlasma samplesDiagnostic (diagnosis of cutaneous melanoma)90.0%0.80
miR-149-3p
miR-150-5p
miR-193a-3p
Upregulated
Upregulated
Downregulated
Plasma samplesDiagnostic (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)Diagnostic98.9%95%97.4% (286)
miR-125bDownregulatedTissue samplesDiagnostic biomarker (diagnosis of melanoma)0.880 (281)
miR-211DownregulatedSerum samplesDiagnostic 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 samplesDiagnostic biomarker (identifying uveal melanoma)93%100%
miR-10bUpregulatedSerum samplesDiagnostic biomarker (distinguishing melanoma patients from controls)0.841 (275)

Application of miRNAs as diagnostic tools in melanoma.

Table 5

microRNAExpression patternSamplePrognostic biomarkerROC curve analysisReference
SensitivitySpecificityArea under the ROC curves (AUC)
miR-150-5pDownregulatedSerum samplesPrognostic (discrimination of survival in stage IV)0.69 (118)
Tissue samplesPrognostic (discrimination of stage)0.733
miR-142-3pDownregulatedSerum samplesPrognostic (discrimination of stage IV from stage III)0.69
Tissue samplesPrognostic (discrimination of stage)0.797
miR-142-5pDownregulatedTissue samplesPrognostic (discrimination of stage)0.733
miR-150-5p
miR-142-3p
miR-142-5p
Downregulated
Downregulated
Downregulated
Tissue samplesPrognostic (discrimination of stage)0.838
miR-4633-5pDownregulatedTissue samplesPrognostic (identifying metastatic sinonasal mucosal melanoma)87.5%100%0.88 (175)
miR-1246
miR-185
Upregulated
Upregulated
Plasma samplesPrognostic (identifying metastatic melanoma)90.5%89.1% (288)
miR-9
miR-145
miR-150
miR-155
miR-205
Upregulated
-
-
-
-
Serum samplesPrognostic (distinguishing metastatic melanoma)0.77 (289)
miR-532-5p
miR-106b
-
-
Serum exosomesPrognostic (distinguishing patients with and without metastasis)0.818 (284)
Serum exosomesPrognostic (discriminates stage I–II patients from stage III–IV patients)0.820
miR-23aDownregulatedSerum samplesPrognostic (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 samplesPrognostic biomarker (for OS)0.858 (290)
let-7bDownregulatedTissue samplesPrognostic biomarker (for DFS)0.634 (211)
let-7cDownregulatedTissue samplesPrognostic biomarker (for DFS)0.647
miR-10bUpregulatedSerum samplesPrognostic 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

microRNASNPGenotyping methodSamplesAssociation with melanomaFunctional experimentsReference
miR-146ars2910164G>CBlood samples from 224 patients and 264 healthy controlsAllele 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 interactionrs2910164 G/C (in miR-146a)PCR-RFLPBlood samples from 304 sporadic melanoma patients and 314 control individualsMen carrying allelic combination miR-146a rs2910164 C and RNASEL rs486907 A have highest risk of melanoma (295)
rs486907 A/G (in RNASEL)
miR-146ars2910164 G/CPCR-RFLPSkin samples from 50 melanoma patients and 107 controls, 8 blood samples from patientsGC genotype was significantly increased in the patients compared with the controlsG 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 (). Moreover, the role of epigenetic factors in this process should not be ignored. For instance, CpG methylation of the miR-34a promoter has been suggested as an underlying mechanism for down-regulation of this miRNA in primary melanoma samples and melanoma cell lines (297). Another possible mediators of miRNA dysregulation in the melanoma are melanoma-inducing transcription factors such as MITF whose role in the expression of a number of miRNAs has been verified (298). As several miRNAs are implicated in the modulation of skin response to ultraviolet radiation (299), this environmental carcinogen might also affect expression of miRNAs which are involved in the melanomagenesis.

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

Updates

Copyright

*Correspondence: Mohammad Taheri,

This article was submitted to Skin Cancer, a section of the journal Frontiers in Oncology

Disclaimer

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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