REVIEW article

Front. Mol. Biosci., 05 December 2022

Sec. RNA Networks and Biology

Volume 9 - 2022 | https://doi.org/10.3389/fmolb.2022.1077968

A review on the role of miR-671 in human disorders

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

  • 2. Phytochemistry Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran

  • 3. Department of Biomedical Sciences, Cihan University-Erbil, Kurdistan Region, Iraq

  • 4. Department of Pharmacognosy, College of Pharmacy, Hawler Medical University, Erbil, Iraq

  • 5. Department of Pharmaceutical Basic Science, Faculty of Pharmacy, Tishk International University, Erbil, Iraq

  • 6. Department of Anesthesia, Shahid Madani Hospital, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran

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

  • 8. Institute of Human Genetics, Jena University Hospital, Jena, Germany

  • 9. Tracheal Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran

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Abstract

miR-671 is encoded by a gene on 7q36.1 and contributes to the pathogenesis of a variety of disorders, including diverse types of cancers, atherosclerosis, ischemic stroke, liver fibrosis, osteoarthritis, Parkinson’s disease, rheumatoid arthritis, acute myocardial infarction and Crohn’s disease. In the context of cancer, different studies have revealed opposite roles for this miRNA. In brief, it has been shown to be down-regulated in pancreatic ductal carcinoma, ovarian cancer, gastric cancer, osteosarcoma, esophageal squamous cell carcinoma and myelodysplastic syndromes. Yet, miR-671 has been up-regulated in glioma, colorectal cancer, prostate cancer and hepatocellular carcinoma. Studies in breast, lung and renal cell carcinoma have reported inconsistent results. The current review aims at summarization of the role of miR-671 in these disorders focusing on its target mRNA in each context and dysregulated signaling pathways. We also provide a summary of the role of this miRNA as a prognostic factor in malignancies.

Introduction

microRNAs (miRNAs) are small-sized non-coding RNAs that partake in the post-transcriptional regulation of gene expression through influencing the stability and translation of transcripts. They are transcribed by RNA polymerase II. The pri-miRNAs produced by this enzyme is capped and polyadenylated. This transcript undergoes a series of cleavage by the Drosha and cytoplasmic Dicer ribonuclease enzymes to produce the stem-loop precursor miRNA and mature miRNA, respectively. The latter is embraced into a RNA-induced silencing complex which can recognize target mRNAs and suppress its translation or destabilize it (Macfarlane and Murphy, 2010). miRNAs participate in the pathoetiology of several disorders through modulation of expression of genes (Hussen et al., 2021), altering signaling pathways (Hussen et al., 2022) or interactions with other types of non-coding RNAs (Ghafouri-Fard et al., 2021a; Taheri et al., 2022).

miR-671 is encoded by a gene on 7q36.1 and involved in the pathogenesis of a range of disorders, including diverse types of cancers, atherosclerosis, ischemic stroke, liver fibrosis, osteoarthritis, Parkinson’s disease, rheumatoid arthritis, acute myocardial infarction and Crohn’s disease. There is not sufficient data about the role of this miRNA in normal physiological processes. However, differential expression of this miRNA in the visceral adipose tissues of patients with non-alcoholic fatty liver disease (Estep et al., 2010) indicates its possible role in metabolic pathways. Moreover, miR-671 has been shown to down-regulate the CDR1 (Cerebellar Degeneration-Related protein 1) gene through an Ago2-slicer-dependent mechanism (Hansen et al., 2011). Moreover, this miRNA has been found to be mainly localized in the nucleus (Hansen et al., 2011). There is no clear evidence about differential expression or functional roles of miR-671-3p versus miR-671-5p. The current review aims at summarization of the role of miR-671 in these disorders focusing on its target mRNA in each context and dysregulated signaling pathways. We also provide a summary of the role of this miRNA as a prognostic factor in malignancies.

miR-671 in cancers

The influence of miR-671 in the carcinogenesis has been valued by a number of studies in cancer cell lines, animal models of cancers and samples obtained from affected individuals. In the succeeding sections, we define the role of miR-671 in the carcinogenesis based on these three lines of evidence.

Cell line studies

Up-regulation of miR-671 in cancer cell lines

Studies in colorectal cancer cell lines have shown down-regulation of circ_PTPRA. Exosomal circ_PTPRA has been shown to induce cell cycle arrest and inhibit proliferation of colorectal cancer cells. In addition, exosomal circ_PTPRA could promote sensitivity of these cells to radiation, resulting in inhibition of colony formation and induction of apoptosis. Mechanistically, circ_PTPRA functions as a sponge for miR-671-5p to increase SMAD4 levels. Taken together, circ_PTPRA inhibits growth and radioresistance of colorectal cancer cells through down-regulation of miR-671-5p levels. Moreover, suppression of miR-671-5p has also blocked growth and radioresistance of these cells through enrichment of expression of SMAD4 (Yang et al., 2022b). Another study in this type of cancer has shown overexpression of a circular RNA, namely circGLIS2. This circRNA is sponged by miR-671. Over-expression of circGLIS2 has led to activation of NF-ƙB pathway and induction of production of pro-inflammatory chemokines leading to stimulation of tumor-associated inflammatory responses via recruitment of leukocytes. Taken together, circGLIS2 activates NF-ƙB signaling and promotes migratory ability of colorectal cancer cells through adsorbing miR-671 (Figure 1) (Chen et al., 2020a). Another functional study in colorectal cancer cells has shown the effect of miR-671-5p up-regulation in enhancement of cell proliferation, migratory capacity, and invasiveness of these cells, whereas its downregulation has led to reverse effects. Therefore, miR-671-5p has been suggested as an oncogenic miRNA in colon cancer which exerts its effects through targeting Tripartite Motif Containing 67 (TRIM67) (Jin et al., 2019), a gene, that is, possibly involved in zinc ion binding activity, regulation of protein localization and negative regulation of Ras protein signal transduction (https://www.genecards.org/cgi-bin/carddisp.pl?gene=TRIM67).

FIGURE 1

miR-671-3p has also been shown to exert oncogenic roles in glioma cells through targeting CKAP4 (Lu et al., 2018). Moreover, it has been demonstrated to be sponged by the tumor suppressor circRNA circDLC1 in these cells (Wu et al., 2022a). A single study in lung cancer cells has shown that miR-671-3p enhances progression of lung cancer through blocking expression of FOXP2 expression in lung cancer (Li et al., 2019b), thus referring to an oncogenic role for this miRNA in lung cancer.

Two independent studies in glioblastoma cell lines have revealed that miR-671-5p has transforming roles. Firstly, more than two-fold upregulated levels of miR-671-5p reduced levels of CDR1-AS/VSNL1 in glioblastoma cell lines A172, CAS-1 and DBTRG. This phenomenon is associated with increased migration and proliferation (Barbagallo et al., 2016). In another study it was demonstrated that if upregulated, miR-671-5p has oncogenic roles, but with competing endogenous features of Circular RNA circ_0001946, this miRNA is suppressed and its suppression is in favor of benign properties (Li and Diao, 2019).

Prostate cancer related bioinformatics analysis has shown that miR-671-5p is amongst top differentially expressed miRNAs (Zhu et al., 2020). miR-671-5p has a binding site on the 3′-UTR region of NFIA (Zhu et al., 2020). According to Yang et al., NFIA acts as a tumor suppressor gene in glioma and squamous carcinoma (Yang et al., 2018). Upregulation of miR-671-5p in prostate cancer cell lines reduces NFIA/CRYAB levels and contributes to malignant features like increased proliferation, migration and invasion (Figure 2) (Zhu et al., 2020).

FIGURE 2

In kidney cancers category, miR-671-5p has been shown to be overexpressed patterns in clear cell renal cell carcinoma (ccRCC) cell lines (786-O and CAKI-1) (Chi et al., 2020). Its overexpression is regulated by HMGA1, which involves in chromatin remodeling (Chiefari et al., 2018). Upregulated levels of miR-671-5p targets APC (a tumor suppressor gene) and gives rise to invasiveness of ccRCC cells (Chi et al., 2020).

Down-regulation of miR-671 in cancer cell lines

The lncRNA PACERR that sponges miR-671 has been shown to increase the number of M2-polarized cells and enhance proliferation, invasiveness and migration of pancreatic cancer cells. From a mechanistical point of view, PACERR has a role in activation of KLF12/p-AKT/c-myc pathway through sponging miR-671-3p. In fact, this lncRNA is regarded as a regulator of tumor-associated macrophages in pancreatic ductal carcinoma microenvironment (Liu et al., 2022b). Moreover, circ_0092314 has been identified as another non-coding RNA that sponges miR-671 in pancreatic cancer cells, thus increasing expression of S100P and inducing epithelial-mesenchymal transition (EMT) (Shen et al., 2021). These two studies have designated a tumor suppressor effect for miR-671 in pancreatic cancer.

The miR-671-sponging circRNA Circ_0001946 has been shown to be over-expressed in tamoxifen resistant breast cancer cells. This circRNA has been shown to be activated by YY1 in these cells. miR-671-5p mimics could partially reverse the effects of circ_0001946 up-regulation in enhancement of proliferation and invasive properties of drug-resistant breast cancer cells. EGFR has been shown to be the downstream target of miR-671-5p in these cells (Gao et al., 2022). Another study has shown the sponging effect of circSLC8A1 on miR-671 and the impact of this miRNA in the regulation of PTEN/PI3k/AKT pathway (Zhu et al., 2021). Moreover, miR-671-3p has been shown to suppress proliferation and invasiveness of breast cancer cells through modulation of expression of the MTOR-interacting protein DEPTOR (Xia et al., 2020).

Lung cancer cells have also been the subject of functional studies on the role of miR-671. As an example of these studies, Liu et al. (2022a) have shown that the oncogenic role of circRIP2 in this type of cancer is exerted through sequestering miR-671-5p and increasing expression of FOXM1. Moreover, miR-671-5p has been found to inhibit proliferation, migration and invasive aptitude of lung cancer cells through targeting MFAP3L (Ye et al., 2022).

In esophageal squamous cell carcinoma cell lines (including different subtypes of KYSE), elevated levels of FGFR2 activates ERK and AKT signaling pathway and contributes to the malignancy (Li et al., 2019a). Interestingly, miR-671-5p level has shown to be downregulated, hence acting as a tumor suppressor (Li et al., 2019a). Forced expression of this miRNA contributes to diminished levels of FGFR phosphorylation, thus reversing malignant features like proliferation and migration (Li et al., 2019a).

Downregulated levels of miR-671 have also been shown in gastric cancer. In a study conducted by Qiu et al. (2018), reduced level of miR-671-5p has been demonstrated in MKN28 cells compared with normal gastric cells, suggesting an anti-tumor role. Elevating its expression yields decreased ratio of Bcl-2/Bax (increase in BAX), thus promoting apoptosis (Qiu et al., 2018). miR-671-5p targets URGCP and inhibits its expression in MKN28 cells (Qiu et al., 2018). Considering the roles of Up regulator Of Cell Proliferation (URGCP) in the carcinogenesis (Xie et al., 2012; Cai et al., 2015), there is no surprise that targeting it by miR-671-5p has shifted MKN28 cells to normal cell features (Qiu et al., 2018).

Detailed information about the roles of miR-671 in different cancer cell lines is shown in Table 1.

TABLE 1

Tumor typemicroRNA typeLevels in cancer cell lines compared with normal cell linesInteractionsDownstream target of miRNAEffect of miR-671 up-regulation on its targetCell lineAssociated phenotypes with dysregulation of miR-671References
Colorectal cancermiR-671-5pUpregulatedcirc_PTPRA/SMAD4SMAD4InhibitionHCT116 and DLD1↑ circ_PTPRA: ↓ miR-671-5p ↑ SMAD4: ↓ cell growth ↑ sensitivity to radiationYang et al. (2022b)
miR-671Downregulated (by GLIS2)GLIS2/NF-ƙBNF-ƙB signalingInhibitionDLD1, HCT-8, HCT116, RKO, HT-29 and HCT-15↑ GLIS2: ↓ miR-671-5p ↑ NF-ƙB ↑ migration ↑ motilityChen et al. (2020a)
miR-671-5pUpregulatedTRIM67TRIM67InhibitionSW480, SW620, LOVO, HCT116↑ miR-671-5p: ↓ TRIM67 ↑ proliferation ↑ migration ↑ invasionJin et al. (2019)
Pancreatic ductal adenocarcinomamiR-671-3pDownregulated (By PACERR)PACERR/KLF12/p-AKT/c-mycKLF12InhibitionTHP-1 and PATU-8988↑ PACERR: ↓ miR-671-3p: ↑ KLF12/p-AKT/c-myc ↑ cell invasion ↑ migrationLiu et al. (2022b)
miR-671Downregulatedcirc_0092314/S100PSP100PInhibitionAsPC-1, BxPC-3, SW-1990 and PaCa-2↑ circ_0092314: ↓ miR-671: ↑ S100P ↑ EMT ↑ invasionShen et al. (2021)
GliomamiR-671-5pUpregulatedcircDLC1/CTNNBIP1CTNNBIP1InhibitionT98G, LN229, A172, and LN18↑ circDLC1: ↓ miR-671-5p ↑ CTNNBIP1 ↓ proliferationWu et al. (2022a)
miR-671-3pUpregulatedCKAP4CKAP4Inhibition↑ miR-671-3p: ↓ CKAP4 ↑ proliferation ↑ migrationLu et al. (2018)
Breast cancermiR-671-5pDownregulated (by Circ_0001946)Circ_0001946/EGFREGFRInhibitionMDA-MB-231 and MDA-MB-436↑ Circ_0001946: ↓ miR-671-5p ↑ EGFR ↑proliferation, ↑ resistance to tamoxifenGao et al. (2022)
miR-671UpregulatedcircSLC8A1/KLF16 PTEN/PI3k/AktKLF16InhibitionMCF7, T47D, BT474 and MDA-MB-231↓ circSLC8A1: ↑ miR-671 ↓ PTEN ↑ PI3k/Akt: ↑ proliferation ↑ migration ↑ invasionZhu et al. (2021)
miR-671-3pDownregulatedDEPTORDEPTORInhibitionMCF-7, MDA-MB-231, SK-BR-3↑ miR-671-3p: ↓ DEPTOR ↓ invasion ↓ migration ↓ viabilityXia et al. (2020)
miR-671-5pDownregulatedFOXM1FOXM1Inhibition21T↑ miR-671-5p: ↓ FOXM1 ↓ proliferation ↓ migration ↓ invasion ↓ chemoresistanceTan et al. (2019)
miR-671-3pDownregulatedHNRNPA2/B1--MCF-7↑ HNRNPA2/B1: ↓ miR-671-3pKlinge et al. (2019)
miR-671-3p-Wnt--MDA-MB-231↑ miR-671-3p: ↓ proliferation ↑ apoptosisXiong et al. (2018)
miR-671Upregulated in drug resistant cell lines---MDA-MB-231Drug resistant cell lines exhibited up-regulation of miR-671Chen et al. (2016)
miR-671-5pDownregulatedFOXM1FOXM1InhibitionMDA-MB-231, Hs578T, SKBR3, BT-20, MDA-MB-468, MCF-7, and T47D↑ miR-671-5p: ↓ FOXM1 ↓ proliferation ↓ migration ↓ EMT ↑ sensitivity to chemotherapyTan et al. (2016)
Ovarian cancermiR-671-5p-HDAC5/HIF-1αHDAC5 & HIF-1αInhibitionH8910↑ miR-671-5p: ↓ HDAC5/HIF-1α: ↓ proliferation ↓ migration ↓ invasion ↑ apoptosisPeng et al. (2022)
Non-small cell lung cancermiR-671-5pDownregulated (by CircRIP2)CircRIP2/FOXM1FOXM1InhibitionA549, H460 and HCC827↑ CircRIP2: ↓ miR-671-5p ↑ FOXM1 ↑ proliferation ↑ migrationLiu et al. (2022a)
miR-671-5pDownregulatedMFAP3LMFAP3LInhibitionH1299, 95D and A549∆ miR-671-5p: ↑ MFAP3L ↑ proliferation ↑ migration ↑invasionYe et al. (2022)
miR-671-3pUpregulatedFOXP2FOXP2InhibitionA549 and H1975∆ miR-671-3p: ↑ FOXP2 ↓ proliferation ↑ apoptosisLi et al. (2019b)
miR-671-3pDownregulatedCCND2CCND2InhibitionA549, H1299, H1650 and H1975↑ miR-671-3p: ↓ CCND2 ↓ proliferation ↓ invasionYao et al. (2019)
Lung adenocarcinomamiR-671-5p-C8orf34-as1/MFAP4C8orf34-as1 and MFAP4InhibitionA549 and H1299↑ miR-671-5p: ↓ MFAP4 ↑ tumor formationHan et al. (2021)
Lung squamous carcinomamiR-671–5pDownregulatedCDR1as/CDR1CDR1asInhibitionSK-MES-1 and H520↑ miR-671–5p: ↓ CDR1as ↓ metastasisHarrison et al. (2020)
Gastric cancermiR-671-5pDownregulatedCirc_0000620/MMP2MMP2InhibitionHGC27 and AGS↑ Circ_0000620: ↓ miR-671-5p ↑ MMP2 ↑ proliferation ↑ invasionRen et al. (2021)
miR-671-5pDownregulated (by CircPIP5K1A)CircPIP5K1A/KRT80/PI3K/AKTKRT80InhibitionMKN45, AGS, BGC823, MGC803 and SGC7901↑ CircPIP5K1A: ↓ miR-671-5p ↑ KRT80/PI3K/AKT ↑ proliferation ↑ Invasion ↑ migration ↑ EMTSong et al. (2020)
miR-671-5pDownregulatedURGCPURGCPInhibitionMKN28↑ miR-671-5p: ↓ URGCP ↓ proliferation ↑ apoptosisQiu et al. (2018)
GlioblastomamiR-671-5pDownregulatedMSI1/STAT3/TRAF2STAT3InhibitionHs683, SW1783, U251, and U87 GBM↑ MSI1: ↓ miR-671-5p: ↑ STAT3 ↑ TRAF2 ↑ proliferation ↓ radiation sensitivity ↑ cancer stem cell featuresLin et al. (2021)
miR-671-5pUpregulatedcirc_0001946/CDR1CDR1InhibitionU87 and U251 cells↑ circ_0001946: ↓ miR-671-5p ↑ CDR1 ↑ apoptosis ↓ migration ↓ invasionLi and Diao, (2019)
miR-671-5pUpregulatedCDR1-AS/CDR1/VSNL1CDR1-AS and VSNL1InhibitionA172, CAS-1, DBTRG, HCT-116, SK-N-BE, SNB-19, U-87 MG↑ miR-671-5p: ↓ CDR1-AS/VSNL1 ↑ migration ↑ proliferationBarbagallo et al. (2016)
Papillary thyroid carcinomamiR-671-5p-TRIM14TRIM14InhibitionIHH-4 and TPC-1↑ miR-671-5p: ↓ TRIM14 ↓ viability ↓ colony formation ↓ migration ↓ invasionWang et al. (2021c)
OsteosarcomamiR-671-5pDownregulatedSMAD3SMAD3InhibitionhFOB1.19, MG63, U2OS and Saos-2↑ miR-671-5p: ↓ SMAD3 ↓ EMT ↓ invasionHu et al. (2021)
miR-671-5pDownregulatedTUFT1TUFT1InhibitionSaos-2, U2OS, and MG-63↑ miR-671-5p: ↓ TUFT1 ↓ viability ↓ migration ↓ invasionMa et al. (2020)
miR-671-5pDownregulatedDLEU1/DDX5DDX5InhibitionHOS, MG63, U2OS, and Saos-2↑ DLEU1: ↓ miR-671-5p ↑ DDX5 ↑ proliferation ↑ migration ↑ invasionChen et al. (2019b)
miR-671-5pDownregulatedCCND1/CDC34CCND1/CDC34InhibitionU2OS, HOS, Saos-2, MNNG/HOS CI #5, and MG-63↑ miR-671-5p: ↓ CCND1/CDC34 ↓ proliferationXin et al. (2019)
Prostate cancermiR-671–5pUpregulatedNFIA/CRYABNFIAInhibitionRWPE-1, LNCaP, PC-3M, 22RV-1, and C4-2↑ miR-671–5p: ↓ NFIA/ CRYAB:↑ proliferation ↑ migration ↑ invasionZhu et al. (2020)
miR-671Upregulated with treatmentSOX6SOX6Inhibition22RV1, DU145, Tsu-Pr1, LNCAP and PC3↑ miR-671:
↓ SOX6
↑ proliferation
Yu et al. (2018)
Human cutaneous malignant melanomamiR-671-5pUpregulated with treatmentGuizhi Fuling Pills/TPT1-AS1--A375Treatment with Guizhi Fuling Pills:
↓ TPT1-AS1
↑ miR-671-5p
↓ proliferation
↓ migration
↓ invasion
Zhang, (2020)
Clear cell renal cell carcinomamiR-671-5pUpregulatedHMGA1/APCAPCInhibition786-O, CAKI-1↑ HMGA1:
↑ miR-671-5p
↓ APC
↑ migration
↑ invasion
↑ EMT
Chi et al. (2020)
Oral squamous cell carcinomamiR-671-5pDownregulated (by CircCDR1)CircCDR1as/AKT/ERK ½/mTOR--ca-8113, SCC-15, and HOK↑ CircCDR1:
↓ miR-671-5p
↓ mTOR
↑ AKT/ERK ½
↑ autophagy
↑ viability
Gao et al. (2019)
Esophageal squamous cell carcinomamiR-671-5pDownregulatedFGFR2/ERK and AKTFGFR2InhibitionKYSE 510, KYSE 410, KYSE 180, KYSE 140, KYSE 30, HKESC1, EC 18, EC 109, EC 9706↑ miR-671-5p: ↓ ERK and AKT ↓ phosphorylation of FGFR2 ↓ proliferation ↓ Colony formation ↓ migration ↓ invasion ↓ tumorigenesisLi et al. (2019a)
Hepatocellular carcinomamiR-671-5pDownregulated (hypoxia induced)HIF-1α/TUFT1/Ca2+/PI3K/AKTTUFT2InhibitionHep3BHypoxia: ↓ miR-671-5p: ↑ TUFT2 ↑ Ca2+/PI3K/AKT ↑ proliferation ↑ metastasisDou et al. (2019)
Epithelioid sarcomamiR-671-5p-SMARCB1SMARCB1InhibitionHT-1080, Caco-2, and HDFa↑ miR-671-5p: ↓ SMARCB1Papp et al. (2014)

Function of miR-671 in cancer cell lines (Arrows indicate the effects of changes in the expression of mentioned genes (either endogenous or exogenous). ∆: knockdown or downregulation, MPP+: 1-methyl-4-phenylpyridinium).

Animal studies

Different animal studies have been performed to evaluate the impact of miR-671 dysregulation on the course of tumor formation. Moreover, a number of other studies have focused on circRNAs that act as molecular sponges for miR-671. For instance, up-regulation of circ_00923 in pancreatic cancer cells has led to down-regulation of miR-671 in tissues of affected animals and enhancement of tumor growth (Shen et al., 2021). On the other hand, over-expression of circ_0001946 has resulted in reduction of glioma growth in animal models (Li and Diao, 2019) Similar to cell line studies, studies in xenograft models of cancers have indicated different results regarding the oncogenic versus tumor suppressor effect of miR-671 (Table 2). For instance, in pancreatic cancer models, down-regulation of miR-671 has been associated with enhancement of tumor growth (Shen et al., 2021). Similar results have been obtained in xenograft models of ovarian cancer (Peng et al., 2022). On the other hand, studies in animal models of colorectal cancer have reported opposite results (Yang et al., 2022b). Detailed information about the role of miR-671 in animal models of cancer is presented in Table 2.

TABLE 2

Tumor typemicroRNA typeAnimal modelsTypes of manipulation and engrafted cellsAssociated phenotypes with dysregulation of miR-671References
Pancreatic ductal adenocarcinomamiR-671Nude miceSubcutaneous injection of PaCa-2 cells transfected with specific siRNA against circ_0092314/AsPC-1 cells transfected with circ_0092314 overexpression plasmid↑ circ_0092314: ↓ miR-671 ↑ tumor growthShen et al. (2021)
GliomamiR-671-5pBALB/c nude miceSubcutaneous injection of LN229 cells stably overexpressing METTL3 (lentiviral LV-oe-METTL3)↑ METTL3: ↓ miR-671-5p ↓ tumor growthWu et al. (2022a)
miR-671-5pBALB/c nude miceSubcutaneous injection of U87 cells transfected with circ_0001946↑ circ_0001946: ↓ miR-671-5p ↓ tumor growthLi and Diao, (2019)
GlioblastomamiR-671-5pBALB/c nude miceU87MG cells transplantation into the brain which were transfected with miR-671-5p mimics↑ miR-671-5p: ↓ tumor growthLin et al. (2021)
Ovarian cancermiR-671-5pBALB/c nude mice-∆ miR-671-5p: ↑ tumor growthPeng et al. (2022)
Colorectal cancermiR-671-5pBALB/c nude miceSubcutaneous injection of vector transfected HCT116 cells with circ_PTPRA↑ circ_PTPRA ↓ miR-671-5p: ↓ tumor growth ↓ resistance to radiationYang et al. (2022b)
Papillary thyroid carcinomamiR-671-5pBALB/c nude miceSubcutaneous injection with TPC-1 cells stably transfected with pMIRNA-miR-671-5p (lentiviral)↑ miR-671-5p: ↓ tumor growthWang et al. (2021c)
Breast cancermiR-671BALB/c nude miceSubcutaneous injection with MCF7 or T47D containing miR-671 inhibiting vectors↓ miR-671: ↓ tumor growthZhu et al. (2021)
Lung squamous carcinomamiR-671-5pAthymic nude miceIntravenous injection with overexpressing miR-671-5p H520 cells↑ miR-671-5p: ↓ metastasisHarrison et al. (2020)
Prostate cancermiR-671-5pBALB/c nude miceSubcutaneous injection with PC-3/LV-in-miR-671 (lentiviral)∆ miR-671-5p: ↓ tumor growthZhu et al. (2020)
Clear cell renal cell carcinomamiR-671-5pBALB/c nude miceIntravenous injection with 786-O cells containing miR-671-5p mimics↑ miR-671-5p: ↑ tumor metastasisChi et al. (2020)
Oral squamous cell carcinomamiR-671-5pBALB/c nude miceSubcutaneous injection with Tca-8113 transfected with circCDR1as lentivirus↑ circCDR1: ↓ miR-671-5p ↑ tumor growthGao et al. (2019)
OsteosarcomamiR-671-5pBALB/c nude miceSubcutaneous injection with MNNG/HOS Cl #5 cells (transfected with miR-671-5p)↑ miR-671-5p: ↓ tumor sizeXin et al. (2019)
Esophageal squamous cell carcinomamiR-671-5pBALB/c nude miceSubcutaneous injection with KYSE180 cells transfected with miR-671-5p mimics↑ miR-671-5p: ↓ tumor sizeLi et al. (2019a)

Effect of miR-671 in cancer development based on research in animal models. (∆: knockdown or downregulation).

Studies in human samples

Expression of miR-671-5p has been increased in colon cancer tissues. Notably, up-regulation of miR-671-5p in this type of cancer has been associated with involvement of lymph nodes, TNM stage, and low overall survival time of affected individuals (Jin et al., 2019). In tumor associated macrophages of pancreatic cancer patients, the lncRNA PACERR that sponges miR-7671 has been shown to be over-expressed in association with poor prognosis of patients (Liu et al., 2022b).

Studies in clinical samples of breast cancer have reported different results regarding the expression of miR-671. First, the miR-671-sponging circRNA circ_0001946 has been shown to be over-expressed in breast cancer tissues, leading to down-regulation of miR-671 (Gao et al., 2022). Although two other studies have reported down-regulation of miR-671-3p (Xiong et al., 2018) and miR-671-5p (Tan et al., 2016) in breast cancer samples, another study has demonstrated up-regulation of miR-671 in another cohort of breast cancer patients (Zhu et al., 2021).

Several studies have shown the impact of miR-671 dysregulation on survival of patients with different kinds of cancer, including ovarian, colorectal and lung cancers as well as osteosarcoma (Table 3). However, a single study in breast cancer patients has reported lack of association between expression levels of miR-671 and median survival of patients (Xiong et al., 2018). Moreover, abnormal expression of miR-671 has been associated with tumor size, TNM stage or metastasis in some kind of cancers, such as colorectal cancer (Jin et al., 2019), lung cancer (Ye et al., 2022) and renal cell carcinoma (Chi et al., 2020). In prostate cancer, up-regulation of miR-671-5p has been associated with higher Gleason score, and BCR status and poor prognosis, but not with tumor stage and lymph node metastasis (Zhu et al., 2020).

TABLE 3

Tumor typemicroRNA typeSamplesExpression (tumor vs. normal)Kaplan-Meier and Cox regression analyses (Impact of miR-671 dysregulation)Association of miR-671 levels with clinicopathologic featuresReference
Pancreatic ductal adenocarcinoma (PDAC)miR-671-3p46 PDAC tissues + paired ANTDownregulatedUpregulation is associated with better prognosis-Liu et al. (2022b)
miR-67140 PDAC tissues + paired ANTDownregulatedDownregulation is associated with poor prognosis-Shen et al. (2021)
GliomamiR-671-5p40 glioma tissues + paired ANTUpregulated--Wu et al. (2022a)
miR-671-3p8 glioma tissues + paired ANTUpregulated--Lu et al. (2018)
Breast cancer (BC)miR-671-5p56 BC tissues + paired ANTDownregulated--Gao et al. (2022)
miR-67177 BC tissues + paired ANTUpregulated--Zhu et al. (2021)
miR-671-3p38 BC tissues + paired ANT + 11 GEO datasetsDownregulatedUpregulation had no effect on median survival-Xiong et al. (2018)
miR-671-5p30 IDC tissues + paired ANTDownregulated--Tan et al. (2016)
Ovarian cancer (OC)miR-671-5p92 OC tissues + paired ANTDownregulatedDownregulation is associated with poor prognosis-Peng et al. (2022)
Colorectal cancer (CRC)miR-671-5p25 CRC tissues+ 10 healthy controlsUpregulatedUpregulation is associated with poor prognosis-Yang et al. (2022b)
miR-671-5p115 CRC tissues + paired ANTUpregulatedUpregulation is associated with poor prognosis/low O-Slymph node metastasis and TNM stageJin et al. (2019)
miR-671-5p38 rectal cancer patients (exposed to capecitabine-oxaliplatin and radiotherapy)Upregulated in TRG1 patients--Della Vittoria Scarpati et al. (2012)
Non-small cell lung cancer (NSCLC)miR-671-5p30 NSCLC tissues + paired ANTDownregulated--Liu et al. (2022a)
miR-671-5p56 NSCLC tissues + paired ANTDownregulated-advanced TNM stage and lymph node metastasisYe et al. (2022)
miR-671-3p43 NSCLC tissues + paired ANTDownregulated-tumor size, TNM stage and metastasisYao et al. (2019)
miR-671-3p40 NSCLC tissues + paired ANTUpregulated--Li et al. (2019b)
Lung adenocarcinomamiR-671-5pTCGA databaseHigh mRNA expression-based stemness index is associated with higher miR-671-5p--Han et al. (2021)
miR-671-3p72 lung adenocarcinoma tissues including: 19 EGFR-mutated +17 KRAS-mutated + 16 ALK-rearranged + 20 triple negative cancersDownregulated in ALK-rearranged cases--Kim et al. (2017)
Lung squamous cell carcinoma (LUSC)miR-671478 LUSC tissues + 45 paired ANTUpregulatedUpregulation is associated with high O-S-Chen et al. (2019a)
Gastric cancer (GC)miR-671-5p44 GC tissues + paired ANTDownregulated--Ren et al. (2021)
miR-671-5p25 GC tissues + paired ANTDownregulated--Song et al. (2020)
miR-671-5p30 GC tissues + paired ANTDownregulated--Qiu et al. (2018)
Osteosarcoma (OS)miR-671-5pGSE28423 GSE70414 DatasetsDownregulated--Hu et al. (2021)
miR-671-5pGSE28423 GSE28424 DatasetsDownregulatedDownregulation is associated with poor prognosis-Ma et al. (2020)
miR-671-5p50 OS Tissues + paired ANTDownregulated--Chen et al. (2019b)
miR-671-5p20 OS tissues + paired ANT + GSE28425DownregulatedDownregulation is associated with low O-S-Xin et al. (2019)
Prostate cancer (PCa)miR-671-5p25 PPCa tissues + 15 MPCa tissues + 13 ANT + GSE21032 GSE21036 GSE21034UpregulatedUpregulation is associated with higher Gleason score, and BCR status and poor prognosis. miR-671-5p is an independent factor for predicting BCR-free survivalNot associated with tumor stage and lymph node metastasisZhu et al. (2020)
miR-671-3p66 PCa tissues + 60 healthy controls + 8 controls with atypical lesionUpregulated in black cases--McDonald et al. (2018)
miR-6718 PCa tissues + paired ANTUpregulated--Yu et al. (2018)
miR-671-5pGSE21032 datasetUpregulated--Sadeghi et al. (2016)
Renal cell carcinoma (RCC)miR-671-3p13 lRCC tissues + 15 mRCCDownregulated in metastatic tissues--Zhu et al. (2016)
Clear cell renal cell carcinoma (ccRCC)miR-671-5p90 ccRCC tissues + paired ANTUpregulatedUpregulation is associated with poor prognosis/low O-S. miR-671-5p is an independent prognostic factor for O-Sadvanced TNM stageChi et al. (2020)
miR-671TCGA databaseUpregulated in Mutant BAP1 tumorsUpregulation is associated with poor prognosis/low O-S-Ge et al. (2017)
ChordomasmiR-671-5p7 chordomas with INI1 loss + 12 normal chordomas + 3 nucleolus pulposus (control)Downregulation of SMARCB1/INI1 results in upregulation of miR-671-5p--Malgulwar et al. (2017)
Glioblastoma multiforme (GBM)miR-671-5p45 GBM tissues + 3 healthy tissuesUpregulated--Barbagallo et al. (2016)
Esophageal squamous cell carcinoma (ESCC)miR-671-3p56 ESCC tissues + paired ANTDownregulated--Warnecke-Eberz et al. (2015)
Epithelioid sarcomamiR-671-5p30 epithelioid sarcoma tissues + 2 rhabdoid tumor tissues + 2 SMARCB11 epithelioid sarcoma tissues + 3 epithelioid sarcoma with biallelic-deleted SMARCB1 tissuesUpregulated in epithelioid sarcoma tissues--Papp et al. (2014)
Hepatocellular carcinoma (HCC)miR-671-5p265 HCC patients + 354 CHB patients + 205 healthy controlsUpregulated in HCC patients--Sun et al. (2013)
ProlactinomamiR-671-5p15 prolactinoma patients (5 patients treated with bromocriptine)Downregulated in treated patients--Wang et al. (2012)
Myelodysplastic syndromes (MDS)miR-671-5p19 MDS tissues + 8 healthy controlsDownregulated--Borze et al. (2011)

Abnormal levels of miR-671 in clinical specimens.

ANT, Adjacent normal tissue; PPCa, Primary localized PCa tissues; MPCa, Metastatic PCa tissues; BCR, Biochemical recurrence; O-S, Overall survival; lRCC, Localized renal cell carcinoma; mRCC: Metastatic renal cell carcinoma; IDC, Invasive ductal carcinoma; CHB, chronic hepatitis B; TRG1, Tumor regression grade 1.

Association between miR-671 variants and risk of soft tissue sarcomas has been assessed in a population of Chinese patients and healthy controls. The results of this study has shown association between miR-671 rs1870238 GC + CC and miR-671 rs2446065 CG + GG genotypes and risk of this type of tumor after adjustment for age and smoking (Zhang et al., 2022a).

Non-malignant conditions

Cell line studies

Experiments in ox-LDL-treated HUVECs have shown down-regulation of miR-671-5p and up-regulation of circPTPRA expression. These two transcripts have been shown to interact with each other. While circPTPRA silencing has reversed ox-LDL-induced decrease in viability of HUVECs, miR-671-5p downregulation could abolish this effect. Cumulatively, circPTPRA silencing can protect against ox-LDL-associated HUVECs damage through enhancing expression of miR-671-5p (Luo and Zhou, 2022).

Another study has shown that the effects of ANRIL silencing in alleviation of neuroinflammatory responses in ischemia is mediated through influencing the miR-671-5p/NF-κB axis (Figure 3) (Deng et al., 2022). Moreover, miR-671-5p could attenuates neuroinflammation through suppression of NF-κB levels (Deng et al., 2021).

FIGURE 3

miR-671-5p expression has been revealed to be reduced in S1P-induced hepatic stellate cells and TGFβ1-activated hepatic sinusoidal endothelial cells. Moreover, its expression has been negatively correlated with levels of Angpt1 and VWF. Mechanistically, miR-671-5p could target Angpt1 and VWF (Yang et al., 2022b).

miR-671-5p has also been shown to facilitate the effect of lncRNA DLEU1 in the regulation of chondrocytes proliferation, inflammatory responses, and degradation of extracellular matrix (Wu et al., 2022b). Moreover, the sponging effect of circ_0043947 on miR-671-5p is involved in the pathoetiology of IL1β-induced chondrocyte damage and pathogenesis of osteoarthritis (He et al., 2022). Table 4 summarizes the role of miR-671 in the pathogenesis of non-malignant conditions based on the results of cell line studies.

TABLE 4

Disease typemicroRNA typeInteractionsCell lineAssociated phenotypes with dysregulation of miR-671Reference
AtherosclerosismiR-671-5pCircRNA-PTPRAHUVECsox-LDL treatment: ↑ CircRNA-PTPRA ↓ miR-671-5p progression of diseaseLuo and Zhou, (2022)
Ischemic StrokemiR-671-5pANRIL/NF-ƙBOGD/R HT22↓ ANRIL: ↑ miR-671-5p ↓ NF-ƙB ↑ cell viability ↓ cell cytotoxicityDeng et al. (2022)
miR-671-5pNF-ƙBOGD/R HT22↑ miR-671-5p ↓ NF-ƙB ↓ neuroinflammationDeng et al. (2021)
Liver fibrosismiR-671-5pAngpt1Primary mouse HSCs↓miR-671-5p: ↑Angpt1 Regulation of angiogenesisYang et al. (2022b)
Osteoarthritis (OA)miR-671-5pDLEU1Human chondrocytes↑ DLEU1: ↓ miR-671-5p: survival of Chondrocyte, ECM degradation, ↑inflammatory factorsWu et al. (2022b)
miR-671-5pIL-1β/Circ_0043947/RTN3Human primary chondrocytes↑ IL-1β: ↑ Circ_0043947 ↓ miR-671-5p ↑ RTN3 ↑inflammationHe et al. (2022)
miR-671-5pIL-1β/circ-IQGAP1/TCF4CHON-001↑ IL-1β: ↑ circ-IQGAP1 ↓ miR-671-5p ↑ TCF4 ↑ apoptosis ↑ inflammationXi et al. (2021)
miR-671IL-1β/Circ_0114876/TRAF2CHON-001↑ IL-1β: ↑ Circ_0114876 ↓ miR-671 ↑ TRAF2 ↑ inflammationWang et al. (2021b)
miR-671-3pTRAF315 OA+ 15 control Chondrocytes↑ miR-671-3p: ↓ TRAF3 ↑ matrix ↑ proliferation ↓ inflammation ↓ apoptosisLiu et al. (2019)
miR-671IL-1βCHON-001↑ IL-1β and ↑ miR-671: ↓ inflammation ↓ apoptosisHou et al. (2019)
Mixed dry eye diseasemiR-671-5pNONMMUT047964.2/Egr-1MCECs↑ NONMMUT047964.2: ↓ miR-671-5p ↑ Egr-1 ↑ inflammationTang et al. (2022)
Parkinson’s diseasemiR-671-5pLINC00943//ELAVL1SK-N-SHMPP + treatment: ↑ LINC00493 ↓ miR-671-5P, ↑ ELAVL1 ↑ apoptosis ↑ toxicityZhang et al. (2022b)
miR-671CDR1as/GSK3βPC12Ex-4 treatment: ↓ CDR1as ↑ miR-671 ↓ phosphorylation of GSK3β ↓ injuryQuan et al. (2021)
Rheumatoid arthritismiR-671-5pCirc_0001947/STAT3RA-FLSs and normal FLSs↑ Circ_0001947 ↓ miR-671-5p ↑ STAT3 ↑ inflammation ↑ cell migrationYang et al. (2022a)
miR-671-5pCirc-FAM120A/MDM4RA-FLSs and normal FLSsPaeoniflorin treatment: ↓ Circ-FAM120A ↑ miR-671-5p ↓ MDM4 ↓ Proliferation ↓ migration ↓ invasion ↓ inflammationGhafouri-Fard et al. (2021b)
miR-671-5pcirc-PTTG1IP/TLR4RA-FLSs and normal FLSs∆ circ-PTTG1IP: ↑ miR-671-5p ↓ TLR4 ↑ apoptosis ↓ Proliferation ↓ migration ↓ invasion ↓ inflammationChen et al. (2021)
Podocyte injurymiR-671-5pWnt/β-CateninHuman embryonic kidney 293T cells↑ Wnt/β-Catenin: ↑ miR-671-5p ↑ InjuryWang et al. (2021a)
Acute myocardial infarctionmiR-671TGFBR2/Smad2CP-M138, CP-M073↓ miR-671: ↑ TGFBR2/Smad2 ↑ cardiomyocyte injuryZhan et al. (2021)
Crohn’s diseasemiR-671NOD2/NF-ƙBHCT116↑ miR-671: ↓ NOD2/NF-ƙB ↓ inflammationChuang et al. (2014)

Cell line studies showing the role of miR-671 in non-malignant conditions.

ox-LDL, Oxidized low-density lipoprotein; OGD/R, Oxygen glucose deprivation/reperfusion; Ex-4, Exendin-4.

Animal studies

Expression of miR-671-5p has been down-regulated in the mouse fibrotic liver. Notably, its levels have been negatively correlated with expressions of Angpt1, VWF, sphingosine kinase-1, TGFβ1, HIF1α, HIF2α, and markers of fibrosis. Moreover, expression of miR-671-5p has been lower in hepatic sinusoidal endothelial cells and hepatic stellate cells of CCl4 mice compared with control mice. Administration of miR-671-5p agomir could decrease expressions of Anpgt1 and VWF mRNA and protein levels, and attenuate angiogenesis and fibrosis in the liver of animal models (Yang et al., 2022b). Other investigations in animal models of ischemic stroke, mixed dry eye disease, podocyte injury, acute myocardial infarction and osteoarthritis have verified the role of miR-671 in the pathogenesis of these disorders (Table 5).

TABLE 5

Disease typemicroRNA typeAnimal modelsResultsReferences
Ischemic StrokemiR-671-5pMCAO/R C57/BL6 mice↓ ANRIL: ↑ miR-671-5p Inhibition of NF-ƙB, Decreased infraction and damaged cellsDeng et al. (2022)
miR-671-5pMCAO/R C57/BL6 mice↑ miR-671-5p: Inhibition of NF-ƙB Decreased inflammationDeng et al. (2021)
Liver fibrosismiR-671-5pMale ICR mice injected with CCL4↓miR-671-5p: ↑Angpt1 and VWF Induction of angiogenesis in liver fibrosisYang et al. (2022b)
Mixed dry eye diseasemiR-671-5pfemale C57BL/6J mice↓miR-671-5p: ↑Egr-1 Increased inflammationTang et al. (2022)
Podocyte injurymiR-671-5pBALB/c mice/male CD-1 mice↑ miR-671-5p: Aggravation of glomerular sclerotic and renal fibrosisWang et al. (2021a)
Acute myocardial infarctionmiR-671C57BL/6JNifdc mice↓ miR-671: ↑ inflammation ↑ apoptosis ↑ fibrosisZhan et al. (2021)
OsteoarthritismiR-671C57BL/6 male wild-type mice↑ miR-671: ↓ progression of diseaseHou et al. (2019)

Animal studies on the role of miR-671 in non-malignant conditions (MCAO: middle cerebral artery occlusion-reperfusion).

Studies in human samples

A high throughput sequencing study in pseudoexfoliation syndrome has led to identification of four aberrantly expressed miRNAs among them being miR-671-3p (Tomczyk-Socha et al., 2022). miR-671-5p has also been among miRNAs participating in the pathogenesis of periodontitis through establishment of ceRNA regulatory network regulating autophagy (Bian et al., 2022). miR-671 has also been found to be down-regulated in patients with rheumatoid arthritis (Tang et al., 2019), hand, foot, and mouth disease (Lin et al., 2020), placenta accreta spectrum (Chen et al., 2020b), coronary artery disease (Zhong et al., 2020), Parkinson’s disease (Uwatoko et al., 2019) and Kawasaki disease (Zhang et al., 2018). Table 6 shows the detailed information about the role of this miRNA in human diosrders.

TABLE 6

Disease typemicroRNA typeNumber of clinical samplesExpression (case vs. control)Expression assaysReferences
Atherosclerosis (AS)miR-671-5p30 AS patients + 30 healthy controlsDownregulatedApplied Biosystems 7500 Fast Real-Time PCR systemLuo and Zhou, (2022)
Liver fibrosismiR-671-5p20 liver fibrosis patients + 6 healthy controlsDownregulatedABIPrism 7300 sequence detecting systemYang et al. (2022b)
Osteoarthritis (OA)miR-671-5p30 OA patients + 20 controlsDownregulatedSYBRTM Green kit on ABI7500 PCR SystemWu et al. (2022b)
miR-671-5p32 OA patients + 32 controlsDownregulatedSYBRXi et al. (2021)
miR-67130 OA patients + 20 controlsDownregulatedSYBR Premix ExTaq at ABI Prism 7500Wang et al. (2021b)
miR-671-3p41 early OA patients + 50 late OA patientsUpregulated in early OA patientsIllumina’s NextSeq 550 systemAli et al. (2020)
miR-671-3p15 OA patients + 15 controlsDownregulated7900 Real-time systemLiu et al. (2019)
miR-67120 OA patients + 20 controlsDownregulatedSYBR Green PCR Mix reagentHou et al. (2019)
miR-671-3p12 OA patients + 12 controlsDownregulatedSurePrint G3 Human miRNA, 8X60K platform (microarray) + ABI 7300 Real-Time PCR SystemNtoumou et al. (2017)
Pseudo exfoliation syndrome (PEX)miR-671-3p5 PEX patients + 5 healthy controlsDownregulatedIllumina MiSeq instrumentTomczyk-Socha et al. (2022)
PeriodontitismiR-671-5pGSE10334, GSE16134, and GSE54710 datasets (Validation in 5 periodontitis tissues + 5 adjacent healthy tissues)UpregulatedTB Green Premix Ex Taqâ„¢ RR420A/LightCycler 480 SystemBian et al. (2022)
miR-671-5pGSE54710 datasetUpregulated-Wang et al. (2019)
Rheumatoid arthritis (RA)miR-671-5p29 RA synovial tissues + 29 normal synovial tissuesDownregulatedSYBR Premix DimerEraserYang et al. (2022a)
miR-671PBMCs of 18 RA patients + PBMCs of 14 healthy controlsDownregulatedBio-Rad SYBR Green Super mixTang et al. (2019)
miR-671-5p23 RA synovial tissues + 21 normal synovial tissuesDownregulatedSYBRGhafouri-Fard et al. (2021b)
miR-671-5p29 RA synovial tissues + 23 normal synovial tissuesDownregulatedSYBRChen et al. (2021)
Atrial fibrillationmiR-671-5pGSE31821, GSE41177, GSE79768, and GSE68475 datasetsUpregulated-Xiao et al. (2021)
Hand, foot, and mouth disease (HFMD)miR-671-5pGSE85829, GSE94551, GSE52780, and GSE45589 datasetsDownregulated-Lin et al. (2020)
miR-671-5p5ESHFMD + 5 MHFMD + 5 healthy controls in initial phase/18 ESHFMD + 18 MHFMD + 18 healthy controls in validation phaseDownregulatedAgilent Technologies (microarray)/ABI 7500 Real-Time PCR SystemJia et al. (2014)
Placenta accreta spectrum (PAS)miR-671-3p12 PAS patients + 12 healthy pregnant women in the screening phase/41 PAS patients + 41 healthy pregnant women in the training phase/20 PAS patients + 20 PP patients + 20 PE patients and 20 healthy pregnant women in the validation phaseDownregulatedTB Greenâ„¢ Premix Ex Taqâ„¢ IIChen et al. (2020b)
Coronary artery disease (CAD)miR-671-3p80 CAD patients + 20 healthy controlsDownregulatedLightCycler 480 (Roche)Zhong et al. (2020)
Multiple system atrophy (MSA)miR-671-5p31 probable MSA-C patients + 30 probable MSA-P patients + 28 healthy controlsDownregulated in MSA-P patients3D-Gene® Human miRNA oligo chip (Ver. 17.0), Applied Biosystem® StepOnePlus™ real time PCR systemUwatoko et al. (2019)
Parkinson’s disease (PD)miR-671-5p28 PD patients + 28 healthy controlsDownregulated3D-Gene® Human miRNA oligo chip (Ver. 17.0), Applied Biosystem® StepOnePlus™ real time PCR systemUwatoko et al. (2019)
Kawasaki diseasemiR-671-5pGSE60965 datasetDownregulated-Zhang et al. (2018)
Hepatitis B virus (HBV) infectionmiR-671-5p8 immunotolerant + 8 acute viral hepatitis + 16 no fibrosis + 19 early and 14 fibrosis, + 7 healthy controlsUpregulated in advance fibrosisAgilent´s human miRNA microarray version V16Singh et al. (2018)
Blood stasis syndrome (BSS)miR-671-3pBSS patients including: 10 QDBS patients + 10 QSBS patients + 10 CCBS patients + 10 HABS patients + 40 diabetic patients without BSSUpregulated in BSS PatientsHiseq2000 platform and bioinformatics analysisChen et al. (2018)
Localized cutaneous leishmaniasis (LCL)miR-67112 LCL patients + 7 healthy controls + GSE55664 and GSE63931miR-671 levels correlate to a better response to treatmentABI 7500 real-time PCR instrumentNunes et al. (2018)
ObesitymiR-671-3p3 obese patients after LAGBDownregulatedTaqMan low density arrays Human MicroRNA Panel v1.0 (microarray)Nardelli et al. (2017)
Graft versus host disease (GVHD)miR-671-3p19 acute GVHD patients + 38 non-GVHD patients in training phase/21 acute GVHD patients + 33 non-GVHD patients in validation phaseUpregulated in acute GVHDTaqMan® Human MicroRNA Array A/GeneAmp(Chen et al., 2020b) PCR System 9700Zhang et al. (2016)
Intrahepatic cholestasis of pregnancy (ICP)miR-671-3p10 ICP patients + 10 healthy pregnant women in initial phase/40 ICP patients + 50 healthy pregnant women in validation phaseUpregulated in ICP patientsViiA7Ma et al. (2016)
Non-alcoholic fatty liver diseasemiR-671-3p12 non-alcoholic steatohepatitis (NASH) tissues + 12 non-NASHDownregulated in NASHTaqMan miRNA Array v 2.0Estep et al. (2010)

Human studies on the role of miR-671 in non-malignant conditions.

PE, Pre-eclamptic; PP, Placenta previa; MSA-P, Parkinsonian variant; MSA-C, Cerebellar variant; QDBS, Qi-deficiency and blood stasis syndrome; QSBS, Qi-stagnation and blood stasis syndrome; CCBS, Cold-coagulation and blood stasis syndrome; HABS, Heat-accumulation and blood stasis syndrome; LAGB, laparoscopic adjustable gastric banding; MHFMD, Mild HFMD; ESHFMD, Extremely severe HFMD.

Expression levels of miR-671 can be used as diagnostic marker in placenta accreta spectrum, osteoarthritis and hand, foot, and mouth disease (Table 7). The best AUC values have been obtained in extremely severe cases of hand, foot, and mouth disease where mir-671 levels could differentiate this condition from healthy status with AUC value of 1.00 (Jia et al., 2014).

TABLE 7

Disease typemicroRNA typeSamplesDistinguish betweenArea under curveSensitivity (%)Specificity (%)References
Placenta accreta spectrum (PAS)miR-671-3p12 PAS patients + 12 healthy pregnant women in the screening phase/41 PAS patients + 41 healthy pregnant women in the training phase/20 PAS patients+20 PP patients+20 PE patients and 20 healthy pregnantPAS vs. healthy pregnant women0.705776Chi et al. (2020)
Osteoarthritis (OA)miR-671-3p12 OA patients + 12 controlsOA patients and healthy controls0.87--Ntoumou et al. (2017)
Hand, foot, and mouth disease (HFMD)miR-671-5p18 ESHFMD + 18 MHFMD + 18 healthy controlsMHFMD vs. healthy controls0.798272Jia et al. (2014)
ESHFMD vs. healthy controls1.00100100Jia et al. (2014)
ESHFMD vs. MHFMD0.828378Jia et al. (2014)

Diagnostic value of miR-671 in diseases (Mild HFMD: MHFMD, extremely severe HFMD: ESHFMD).

Discussion

miR-671 is a miRNA with various roles in human disorders. In the context of cancer, different studies have revealed opposite roles for this miRNA. In brief, it has been shown to be down-regulated in pancreatic ductal carcinoma, ovarian cancer, gastric cancer, osteosarcoma, esophageal squamous cell carcinoma and myelodysplastic syndromes. Yet, miR-671 has been up-regulated in glioma, colorectal cancer, prostate cancer and hepatocellular carcinoma. Studies in breast, lung and renal cell carcinoma have reported inconsistent results which cannot be explained by the differences in the roles of miR-671-3p or miR-671-5p. It is possible that this miRNA exert stage- or grade-specific roles in the carcinogenesis.

miR-671 has functional interactions with circ_PTPRA, circ_0092314, circDLC1, circ_0001946, circSLC8A1, circRIP2, circ_0000620, circPIP5K1A and circCDR1as. In fact, these circRNAs act as molecular sponges for miR-671 to influence expression of miR-671 targets. NF-ƙB, EGFR, PTEN/PI3K/AKT, Wnt, HIF-1α, STAT3 and AKT/ERK/mTOR signaling pathways are among those being influenced by dysregulation of miR-671 in different cancers. Moreover, miR-671 has a role in the regulation of EMT in different tissues. This finding is based on functional studies on the role of this miRNA or circRNAs that sponge this miRNA. Thus, miR-671-targetin therapies might affect progression of cancer, invasiveness and metastatic ability of malignant cells.

miR-671 has also been suggested to predict course of cancers originated from different tissues. This speculation is based on the observed associations between dysregulation of this miRNA and survival of patients as well as correlation between its expression levels and clinicopathological data. However, the role of miR-671 as a diagnostic marker for cancers should be investigated in future. Based on the inconsistencies regarding the exact effects of miR-671 in the development and progression of different cancers, it is not expected that miR-671-targetted therapies enter the clinics in near future. More researches are needed to assign a definite role for this miRNA in each type of cancer.

The impact of miR-671 polymorphisms on risk of cancers has only assessed in sarcoma. Similar studies should be conducted to evaluate the association between these polymorphisms and risk of other cancers.

miR-671 has also a fundamental role in the pathophysiology of non-malignant conditions such as atherosclerosis, ischemic stroke, liver fibrosis, osteoarthritis, Parkinson’s disease, rheumatoid arthritis, acute myocardial infarction and Crohn’s disease. Moreover, it has a potential to be used as a diagnostic marker for placenta accreta spectrum, osteoarthritis and hand, foot, and mouth disease. However, dysregulation of miR-671 in malignant and non-malignant disorders originated from a certain tissue complicates the diagnostic application of this miRNA. Meanwhile, contribution of miR-671 to the pathogenesis of both malignant and non-malignant diseases is best explained by the prominent role of this miRNA in the regulation of activity of signaling pathways the control cell proliferation and apoptosis.

Taken together, miR-671 is a miRNA that can affect several target mRNAs and influence activity of signaling pathways that are involved in a variety of human disorders. However, several questions should be answered in order to propose miR-671-targeted therapies as efficient therapies for human disorders.

Statements

Author contributions

SG-F wrote the draft and revised it. MT designed and supervised the study. AA, BH, and AK collected the data and designed the figures and tables. All the authors read the submitted version and approved it.

Funding

This study was financially supported by Shahid Beheshti University of Medical Sciences.

Acknowledgments

The authors would like to thank the clinical research Development Unit (CRDU) of Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran for their support, cooperation and assistance throughout the period of study.

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.

Publisher’s note

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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Summary

Keywords

mir-671, cancer, biomarker, expression, prognostic

Citation

Ghafouri-Fard S, Askari A, Hussen BM, Rasul MF, Hatamian S, Taheri M and Kiani A (2022) A review on the role of miR-671 in human disorders. Front. Mol. Biosci. 9:1077968. doi: 10.3389/fmolb.2022.1077968

Received

23 October 2022

Accepted

25 November 2022

Published

05 December 2022

Volume

9 - 2022

Edited by

Wei Ye, Guangdong Academy of Science, China

Reviewed by

Meredith Tennis, University of Colorado Denver, United States

Guan Wang, Sichuan University, China

Updates

Copyright

*Correspondence: Mohammad Taheri, ; Arda Kiani,

This article was submitted to RNA Networks and Biology, a section of the journal Frontiers in Molecular Biosciences

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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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