MIR127

Locus Summary

Gene:MIR127; microRNA 127
Aliases: MIRN127, mir-127, miRNA127
Location:14q32.2
Summary:microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]
Databases:miRBase, OMIM, HGNC, Ensembl, GeneCard, Gene
Source:NCBIAccessed: 11 March, 2017

Cancer Overview

Research Indicators

Publications Per Year (1992-2017)
Graph generated 11 March 2017 using data from PubMed using criteria.

Literature Analysis

Mouse over the terms for more detail; many indicate links which you can click for dedicated pages about the topic.

Tag cloud generated 11 March, 2017 using data from PubMed, MeSH and CancerIndex

Specific Cancers (4)

Data table showing topics related to specific cancers and associated disorders. Scope includes mutations and abnormal protein expression.

Note: list is not exhaustive. Number of papers are based on searches of PubMed (click on topic title for arbitrary criteria used).

MicroRNA Function

Numbers shown below represent number of publications held in OncomiRDB database for Oncogenic and Tumor-Suppressive MicroRNAs.

TissueTarget Gene(s)Regulator(s)MIR127 Function in CancerEffect
head and neck (1)
-mucoepidermoid carcinoma (1)
inhibit cell viability (1)
induce cell cycle G1/S arrest (1)
breast (1)
-breast cancer (1)
CXCL12 (1)
decrease cell proliferation (1)
tumor-suppressive (1)

Source: OncomiRDB Wang D. et al. Bioinformatics 2014, 30(15):2237-2238.

Latest Publications: MIR127 (cancer-related)

Pronina IV, Loginov VI, Burdennyy AM, et al.
DNA methylation contributes to deregulation of 12 cancer-associated microRNAs and breast cancer progression.
Gene. 2017; 604:1-8 [PubMed] Related Publications
The methylation of promoter CpG islands and the interaction between microRNAs (miRNAs) and messenger RNAs (mRNAs) of target genes are considered two crucial mechanisms for gene and pathway deregulation in malignant tumors. The aim of this study was to analyze the role of promoter methylation in altering the expression of 13 miRNAs that are associated with breast cancer (BC): miR-124, -125b, -127, -132, -137, -148a, -191, -193a, -203, -212, -34b, -375, -9. The role of methylation in the deregulation of these miRNAs has not been previously assessed in the representative set of BC samples. We used a set of 58 paired (tumor/normal) breast tissue samples and methylation-specific PCR to demonstrate significant aberrations in the methylation patterns of 9 miRNA genes. In particular, we observed hypermethylation of MIR-127, -132, and -193a, and hypomethylation of MIR-191 for the first time. Using quantitative PCR, we established a strong correlation between promoter methylation and expression levels for 12 miRNA genes (all except MIR-212); this finding demonstrates the functional importance of altered methylation patterns. We also performed a correlation analysis between expression levels of the 13 miRNAs and 5 cancer-associated genes, namely RASSF1(A), CHL1, APAF1, DAPK1, and BCL2, which were predicted as targets for these miRNAs, to investigate the impact of these miRNAs on these genes with key cellular functions in BC. Significant negative correlation was revealed for the following miRNA-mRNA pairs: miR-127-5p and DAPK1, miR-375 and RASSF1(A), and miR-124-3p and BCL2. Additionally, we also found a strong association between hypermethylation of MIR-127 and MIR-125b-1 and BC progression, particularly metastasis. Thus, our findings provide evidence for the significant role of methylation in the deregulation of 12 miRNA genes in BC, identify putative novel functional miRNA-mRNA pairs, and suggest MIR-127 and MIR-125b-1 hypermethylation to be potential biomarkers of BC metastasis.

Bi L, Yang Q, Yuan J, et al.
MicroRNA-127-3p acts as a tumor suppressor in epithelial ovarian cancer by regulating the BAG5 gene.
Oncol Rep. 2016; 36(5):2563-2570 [PubMed] Related Publications
In the present study, the tumor-suppressive role of microRNA-127-3p (miR-127-3p) in epithelial ovarian cancer (EOC) was elucidated. Expression of miR-127-3p was examined by quantitative RT-PCR (qRT-PCR) in 9 EOC cell lines and clinical samples from 13 EOC patients. EOC cell lines, OVCAR-3 and Caov-3, were transduced with a lentivirus to overexpress endogenous miR-127-3p. The tumor-suppressive effects of miR-127-3p on EOC proliferation, bufalin sensitivity, invasion and in vivo growth were investigated through proliferation, bufalin sensitivity wound-closure and in vivo tumorigenicity assays, respectively. In addition, luciferase reporter assay and qRT-PCR were conducted to verify whether the Bcl-2-associated athanogene 5 (BAG5) gene was the downstream target of miR-127-3p in EOC. BAG5 was subsequently upregulated in the OVCAR-3 and Caov-3 cells to examine its functional correlation with miR‑127-3p regulation in EOC. The results revealed that in both EOC cell lines and EOC tumor tissues, miR-127-3p was downregulated. Lentiviral-mediated miR-127-3p overexpression exerted tumor-suppressive effects in OVCAR-3 and Caov-3 cells by reducing in vitro proliferation and invasion, increasing bufalin sensitivity, and inhibiting in vivo tumor growth. miR‑127-3p directly regulated the BAG5 gene in EOC. Subsequent BAG5 upregulation ameliorated the tumor-suppressive effects of miR-127-3p overexpression in EOC. In conclusion, miR-127-3p functions as a tumor suppressor in EOC, and its influence on EOC is directly through regulation of BAG5.

Yu Y, Liu L, Ma R, et al.
MicroRNA-127 is aberrantly downregulated and acted as a functional tumor suppressor in human pancreatic cancer.
Tumour Biol. 2016; 37(10):14249-14257 [PubMed] Related Publications
Pancreatic carcinoma is one of the most malignant human cancers. In this study, we intended to explore the molecular functional of microRNA-127 (miR-127) in regulating pancreatic cancer development both in vitro and in vivo. Quantitative real-time PCR (qRT-PCR) was performed to evaluate endogenous miR-127 expression in in vitro pancreatic cancer cell lines and in vivo clinical samples of pancreatic carcinoma. Lentiviral technology was applied to overexpress miR-127 in capan-1 and PANC-1 cells. Pancreatic cancer proliferation, cell-cycle progression, and invasion were assessed in vitro, and capan-1-derived tumorigenicity was evaluated in vivo. Dual-luciferase reporter assay and qRT-PCR were performed to assess the downstream target gene of miR-127 in pancreatic cancer, human Bcl-2-associated athanogene 5 (BAG5). BAG5 was subsequently upregulated in miR-127-overexpressed capan-1 and PANC-1 cells to evaluate its effect on pancreatic cancer progression. MiR-127 was preferentially downregulated in both pancreatic carcinoma cell lines and human pancreatic tumors. In lentivirus-infected capan-1 and PANC-1 cells, miR-127 overexpression significantly inhibited cancer progression, cell-cycle transition and invasion in vitro, as well as tumorigenicity in vivo. Human BAG5 was confirmed to be the downstream target of miR-127 in pancreatic cancer. Forced overexpression of BAG5 in capan-1 and PANC-1 cells reversed the tumor-suppressing effect of miR-127 on cancer development. MiR-127 is downregulated and acting as a tumor suppressor in pancreatic carcinoma. The functional regulation of miR-127 in pancreatic carcinoma is very likely through the inverse correlation of its downstream target gene of BAG5.

Majer A, Blanchard AA, Medina S, et al.
Claudin 1 Expression Levels Affect miRNA Dynamics in Human Basal-Like Breast Cancer Cells.
DNA Cell Biol. 2016; 35(7):328-39 [PubMed] Related Publications
Deemed a putative tumor suppressor in breast cancer, the tight junction protein claudin 1 has now been shown to be highly expressed in the basal-like molecular subtype. Moreover, recent in vitro studies show that claudin 1 can regulate breast cancer cell motility and proliferation. Herein, we investigated whether microRNA (miRNA) dysregulation is associated with alterations in the level of claudin 1. Using next-generation sequencing (NGS), we identified seven miRNAs (miR-9-5p, miR-9-3p, let-7c, miR-127-3p, miR-99a-5p, miR-129-5p, and miR-146a-5p) that were deregulated as a consequence of claudin 1 overexpression in the MDA-MB231 human breast cancer (HBC) cell line. Most of these miRNAs have been associated with tumor suppression in a variety of cancers, including breast cancer. Moreover, through gene expression profiling analysis, we identified epithelial-mesenchymal transition-related genes, including platelet-derived growth factor receptor-beta (PDGFRB) and cadherin 1 (CDH1, E cadherin), whose downregulation correlated with claudin 1 overexpression. Collectively, we show for the first time that in HBC, claudin 1 can alter the dynamics of a number of miRNAs involved in tumor progression. Our data suggest that the dysregulated expression of these miRNAs, in conjunction with the high claudin 1 levels, could serve as a useful biomarker that identifies a subset of tumors within the poorly characterized basal-like subtype of breast cancer. Further studies are warranted to determine the role of these miRNAs in facilitating the function of claudin 1 in breast cancer.

Paydas S, Acikalin A, Ergin M, et al.
Micro-RNA (miRNA) profile in Hodgkin lymphoma: association between clinical and pathological variables.
Med Oncol. 2016; 33(4):34 [PubMed] Related Publications
miRNAs are small RNAs and control the expression of protein-encoding genes. The aim of this study was to determine the association between miRNA profile and clinical variables including age, stage, B symptom, histopathologic subtype, response to treatment, disease-free survival (DFS) and overall survival (OS) in classical Hodgkin lymphoma (cHL). A total of 377 miRNAs were studied by qPCR in 32 cases with cHL, and results were compared with 60 samples taken from cases with reactive lymphadenopathy. Biogazelle qbasePLUS 2.0 software was used to analyze the results. miR-582-3p, miR-525-3p, miR-448, miR-512-3p, miR-642a-5p, miR-876-5p, miR-532-3p, miR-654-5p, miR-128, miR-145-5p, miR-15b-5p, miR-328 and miR-660-5p were found to be decreased in cHL compared with controls. In contrast, miR-34a-5p (2.626-fold), miR-146a-5p (4.32-fold), miR-93-5p (2.347-fold), miR-20a-5p (4.930-fold), miR-339-3p (4.948-fold), miR-324-3p (4.98-fold), miR-372 (7.038-fold), miR-127-3p (8.234-fold), miR-155-5p (4.947-fold), miR-320a (17.502-fold) and miR-370 (21.479-fold) (p < 0.05) were found to be increased in cHL. There was no difference in miRNA profile according to the age, sex, stage, response to treatment, DFS and OS. However, miR-889 was found to be increased in patients with B symptom and miR-127-3p was found to be increased in nodular sclerosing subtype. Some miRNAs increase and some decrease in cHL. However, there was no clinical association between clinical variables and with the majority of the miRNA profile studied in this study. miR-889 and miR-127-3p were related to B symptom and nodular sclerosis subtype, respectively. We need more studies evaluating miRNA profile and clinical outcome in Hodgkin Lymphoma.

Huan L, Bao C, Chen D, et al.
MicroRNA-127-5p targets the biliverdin reductase B/nuclear factor-κB pathway to suppress cell growth in hepatocellular carcinoma cells.
Cancer Sci. 2016; 107(3):258-66 [PubMed] Free Access to Full Article Related Publications
Nuclear factor-κB (NF-κB) activation is one of the major mediators of inflammation-induced cancer cell growth and progression. In previous studies, we screened a series of microRNAs (miRNAs) that targeted the NF-κB signaling pathway. In this study, we showed that miR-127-5p suppressed NF-κB activity through inhibition of p65 nuclear translocation. In addition, miR-127-5p also inhibited the transcription of downstream targets of the NF-κB signaling pathway. While exploring the mechanism of the inhibition of NF-κB activity by miR-127-5p, we found that miR-127-5p decreased the phosphorylation of p65. MicroRNA-127-5p inhibited the growth and colony formation of hepatocellular carcinoma (HCC) cells and decreased biliverdin reductase B (BLVRB) expression by directly binding to its 3'-UTR. RNA interference of BLVRB suppressed HCC cell growth, whereas the overexpression of BLVRB promoted HCC cell growth. Furthermore, BLVRB blockade inhibited the phosphorylation of p65 protein and the expression of downstream targets of the NF-κB signaling pathway, mimicking the function of miR-127-5p. The restoration of BLVRB in HCC cells overexpressing miR-127-5p impaired the suppression of HCC growth by miR-127-5p. Moreover, miR-127-5p was downregulated in 58% of HCC samples. In summary, we found that miR-127-5p suppressed NF-κB activity by directly targeting BLVRB in HCC cells, and this finding improves our understanding of the molecular mechanism of inflammation-induced HCC growth and proliferation and the successful inhibition of NF-κB activity by cancer treatment.

Zhang J, Hou W, Chai M, et al.
MicroRNA-127-3p inhibits proliferation and invasion by targeting SETD8 in human osteosarcoma cells.
Biochem Biophys Res Commun. 2016; 469(4):1006-11 [PubMed] Related Publications
MicroRNAs (miRNAs) play an essential role in cancer development. Several studies have indicated that miRNAs mediate tumorigenesis processes, such as, inflammation, proliferation, apoptosis and invasion. In the present study, we focused on the influence of the miR-127-3p on the proliferation, migration and invasion of osteosarcoma (OS). MiR-127-3p was found at reduced levels in OS tissues and cell lines. Overexpression of miR-127-3p in the OS cell lines significantly inhibited the cell proliferation, migration and invasion; however, inhibition of miR-127-3p increased the proliferation, migration and invasion of OS in vitro. SETD8 was identified as a direct target of miR-127-3p, and SETD8 expression decreased post miR-127-3p overexpression, while SETD8 overexpression could reverse the potential influence of miR-127-3p on the migration and invasion of OS cells. MiR-127-3p is suggested to act mainly via the suppression of SETD8 expression. Overall, the results revealed that miR-127-3p acts as a tumor suppressor and that its down-regulation in cancer may contribute to OS progression and metastasis, suggesting that miR-127-3p could be a potential therapeutic target in the treatment of OS.

Fellenberg J, Sähr H, Kunz P, et al.
Restoration of miR-127-3p and miR-376a-3p counteracts the neoplastic phenotype of giant cell tumor of bone derived stromal cells by targeting COA1, GLE1 and PDIA6.
Cancer Lett. 2016; 371(1):134-41 [PubMed] Related Publications
Although generally benign, giant cell tumors of bone (GCTB) display an aggressive behavior associated with significant bone destruction and lung metastasis in rare cases. This and the very high recurrence rate observed after surgical resection ranging from 20 to 55% necessitates the development of more effective treatment strategies. To identify valuable therapeutic targets, we screened a previously identified microRNA signature consisting of 23 microRNAs predominantly down-regulated in GCTB. We preselected eight candidate microRNAs and analyzed the impact of their restored expression on the neoplastic phenotype of GCTB stromal cells (GCTSC). A consistent and significant inhibition of cell proliferation, migration, colony formation and spheroid formation could be induced by transfection of primary GCTSC cell lines with miR-127-3p and miR-376a-3p, respectively. Genome wide expression analysis of miR-127-3p and miR-376a-3p transfected cells revealed four novel target genes for each microRNA. Luciferase reporter assays demonstrated direct interactions of miR-127-3p with COA1 and direct interaction of miR-376a-3p with GLE1 and PDIA6, suggesting a pivotal role of these genes in the molecular etiology of GTCB. Interestingly, both microRNAs are located within a chromosomal region frequently silenced in GCTB and many other types of cancers, indicating that these microRNAs and their target genes are valuable therapeutic targets for the treatment of GCTB and possibly other tumor entities.

Pathak S, Meng WJ, Nandy SK, et al.
Radiation and SN38 treatments modulate the expression of microRNAs, cytokines and chemokines in colon cancer cells in a p53-directed manner.
Oncotarget. 2015; 6(42):44758-80 [PubMed] Free Access to Full Article Related Publications
Aberrant expression of miRNAs, cytokines and chemokines are involved in pathogenesis of colon cancer. However, the expression of p53 mediated miRNAs, cyto- and chemokines after radiation and SN38 treatment in colon cancer remains elusive. Here, human colon cancer cells, HCT116 with wild-type, heterozygous and a functionally null p53, were treated by radiation and SN38. The expression of 384 miRNAs was determined by using the TaqMan® miRNA array, and the expression of cyto- and chemokines was analyzed by Meso-Scale-Discovery instrument. Up- or down-regulations of miRNAs after radiation and SN38 treatments were largely dependent on p53 status of the cells. Cytokines, IL-6, TNF-α, IL-1β, Il-4, IL-10, VEGF, and chemokines, IL-8, MIP-1α were increased, and IFN-γ expression was decreased after radiation, whereas, IL-6, IFN-γ, TNF-α, IL-1β, Il-4, IL-10, IL-8 were decreased, and VEGF and MIP-1α were increased after SN38 treatment. Bioinformatic analysis pointed out that the highly up-regulated miRNAs, let-7f-5p, miR-455-3p, miR-98, miR-155-5p and the down-regulated miRNAs, miR-1, miR-127-5p, miR-142-5p, miR-202-5p were associated with colon cancer pathways and correlated with cyto- or chemokine expression. These miRNAs have the potential for use in colon cancer therapy as they are related to p53, pro- or anti-inflammatory cyto- or chemokines after the radiation and SN38 treatment.

Feng R, Dong L
Knockdown of microRNA-127 reverses adriamycin resistance via cell cycle arrest and apoptosis sensitization in adriamycin-resistant human glioma cells.
Int J Clin Exp Pathol. 2015; 8(6):6107-16 [PubMed] Free Access to Full Article Related Publications
The aim of this study was to investigate signaling pathways for reversal of microRNA-127-mediated multi-drug resistance (MDR) in gliomas cells. Adriamycin-resistant glioma cell lines U251/adr and U87-MG/adr were established and we found that anti-microRNA-127 markedly reduced microRNA-127 expression levels in a time-dependent manner, leading to distinct inhibition of cell proliferation and increased apoptosis and the content of intracellular Rh123. Silencing of microRNA-127 significantly increased the sensitivity of U251/ADR and U87-MG/adr cells to adriamycin, compared to cells transfected with negative control siRNA. Silencing of microRNA-127 also significantly reduced the mRNA and protein expression levels of MDR1 and MRP1, which are major ATP-binding cassette (ABC) transporter linked to multi-drug resistance in cancer cells. And Runx2, p53, bcl-2 and survivin, which are important role in cell apoptosis, also markedly changed after microRNA-127 silencing. In addition, down-regulating microRNA-127 decreased the level of phosphorylated-Akt. Our data indicate that down-regulation of micorRNA-127 can trigger apoptosis and overcome drug resistance of gliomas cells. Therefore, this resistance of adriamycin in gliomas can be cancelled by silencing expression of microRNA-127.

Ge YZ, Xu LW, Xu Z, et al.
Expression Profiles and Clinical Significance of MicroRNAs in Papillary Renal Cell Carcinoma: A STROBE-Compliant Observational Study.
Medicine (Baltimore). 2015; 94(16):e767 [PubMed] Free Access to Full Article Related Publications
Papillary renal cell carcinoma (pRCC) is the second most prevalent subtype of kidney cancers. In the current study, we analyzed the global microRNA (miRNA) expression profiles in pRCC, with the aim to evaluate the relationship of miRNA expression with the progression and prognosis of pRCC.A total of 163 treatment-naïve primary pRCC patients were identified from the Cancer Genome Atlas dataset and included in this retrospective observational study. The miRNA expression profiles were graded by tumor-node-metastasis information, and compared between histologic subtypes. Furthermore, the training-validation approach was applied to identify miRNAs of prognostic values, with the aid of Kaplan-Meier survival, and univariate and multivariate Cox regression analyses. Finally, the online DAVID (Database for Annotation, Visualization, and Integrated Discover) program was applied for the pathway enrichment analysis with the target genes of prognosis-associated miRNAs, which were predicted by 3 computational algorithms (PicTar, TargetScan, and Miranda).In the progression-related miRNA profiles, 26 miRNAs were selected for pathologic stage, 28 for pathologic T, 16 for lymph node status, 3 for metastasis status, and 32 for histologic types, respectively. In the training stage, the expression levels of 12 miRNAs (mir-134, mir-379, mir-127, mir-452, mir-199a, mir-200c, mir-141, mir-3074, mir-1468, mir-181c, mir-1180, and mir-34a) were significantly associated with patient survival, whereas mir-200c, mir-127, mir-34a, and mir-181c were identified by multivariate Cox regression analyses as potential independent prognostic factors in pRCC. Subsequently, mir-200c, mir-127, and mir-34a were confirmed to be significantly correlated with patient survival in the validation stage. Finally, target gene prediction analysis identified a total of 113 target genes for mir-200c, 37 for mir-127, and 180 for mir-34a, which further generated 15 molecular pathways.Our results identified the specific miRNAs associated with the progression and aggressiveness of pRCC, and 3 miRNAs (mir-200c, mir-127, and mir-34a) as promising prognostic factors of pRCC.

You W, Wang Y, Zheng J
Plasma miR-127 and miR-218 Might Serve as Potential Biomarkers for Cervical Cancer.
Reprod Sci. 2015; 22(8):1037-41 [PubMed] Related Publications
Cervical cancer, a second common cancer in women, represents a major health care problem. Papanicolaou test, colposcopy, and different types of useful biomarkers are current major methods for detection of cervical cancer. However, these methods have the limitation of invasion, expensive cost, manpower issues, and low accuracy. The aim of this study is to explore the application of 3 plasma micro RNAs (miRNAs; miR-127, miR-205, and miR-218) in detection of cervical cancer. Blood samples were collected from 68 patients with cervical cancer, and plasma was extracted and stored at -80°C freezer until use. RUN6B was selected as an internal control to determine the relative expression levels of 3 miRNAs. Quantitative real-time polymerase chain reaction was performed. The result showed that the expression levels of miR-127 and miR-205 in cervical cancers were higher than that in controls (P < .001); however, there was no marked difference in expression of miR-218 in cervical cancers and controls (P > .05). Therefore, we conducted the receiver-operating characteristic curve analyses for miR-127 and miR-205. The sensitivity and specificity of miR-127 in distinguishing patients with cervical cancer from healthy controls were 75.51% and 83.82%, respectively, with the area under the curve (AUC) of 0.820. MiR-205 showed higher predictive value with an AUC of 0.843, sensitivity of 72.00%, and specificity of 82.35%. In conclusion, we identified the predictive power of 3 plasma miRNAs for cervical cancer, and consequence can be concluded that plasma miR-127 and miR-205 are promising tumor markers for cervical cancer.

Uppal A, Wightman SC, Mallon S, et al.
14q32-encoded microRNAs mediate an oligometastatic phenotype.
Oncotarget. 2015; 6(6):3540-52 [PubMed] Free Access to Full Article Related Publications
Oligometastasis is a clinically distinct subset of metastasis characterized by a limited number of metastases potentially curable with localized therapies. We analyzed pathways targeted by microRNAs over-expressed in clinical oligometastasis samples and identified suppression of cellular adhesion, invasion, and motility pathways in association with the oligometastatic phenotype. We identified miR-127-5p, miR-544a, and miR-655-3p encoded in the 14q32 microRNA cluster as co-regulators of multiple metastatic pathways through repression of shared target genes. These microRNAs suppressed cellular adhesion and invasion and inhibited metastasis development in an animal model of breast cancer lung colonization. Target genes, including TGFBR2 and ROCK2, were key mediators of these effects. Understanding the role of microRNAs expressed in oligometastases may lead to improved identification of and interventions for patients with curable metastatic disease, as well as an improved understanding of the molecular basis of this unique clinical entity.

Sandhu V, Bowitz Lothe IM, Labori KJ, et al.
Molecular signatures of mRNAs and miRNAs as prognostic biomarkers in pancreatobiliary and intestinal types of periampullary adenocarcinomas.
Mol Oncol. 2015; 9(4):758-71 [PubMed] Related Publications
Periampullary adenocarcinomas include four anatomical sites of origin (the pancreatic duct, bile duct, ampulla and duodenum) and most of them fall into two histological subgroups (pancreatobiliary and intestinal). Determining the exact origin of the tumor is sometimes difficult, due to overlapping histopathological characteristics. The prognosis depends on the histological subtype, as well as on the anatomical site of origin, the former being the more important. The molecular basis for these differences in prognosis is poorly understood. Whole-genome analyses were used to investigate the association between molecular tumor profiles, pathogenesis and prognosis. A total of 85 periampullary adenocarcinomas were characterized by mRNA and miRNA expressions profiling. Molecular profiles of the tumors from the different anatomical sites of origin as well as of the different histological subtypes were compared. Differentially expressed mRNAs and miRNAs between the two histopathological subtypes were linked to specific molecular pathways. Six miRNA families were downregulated and four were upregulated in the pancreatobiliary type as compared to the intestinal type (P < 0.05). miRNAs and mRNAs associated with improved overall and recurrence free survival for the two histopathological subtypes were identified. For the pancreatobiliary type the genes ATM, PTEN, RB1 and the miRNAs miR-592 and miR-497, and for the intestinal type the genes PDPK1, PIK3R2, G6PC and the miRNAs miR-127-3p, miR-377* were linked to enriched pathways and identified as prognostic markers. The molecular signatures identified may in the future guide the clinicians in the therapeutic decision making to an individualized treatment, if confirmed in other larger datasets.

Wang S, Li H, Wang J, et al.
Prognostic and biological significance of microRNA-127 expression in human breast cancer.
Dis Markers. 2014; 2014:401986 [PubMed] Free Access to Full Article Related Publications
The purpose of this study was to determine the expression of miR-127 and analyze its prognostic and biological significance in breast cancer (BC). A quantitative reverse transcription PCR assay was performed to detect the expression of miR-127 in 15 pairs of BC and corresponding noncancerous tissues. The expression of miR-127 was detected in another 110 BC tissues and its correlations with clinicopathological factors of patients were examined. Univariate and multivariate analyses were performed to analyze the prognostic significance of miR-127 expression. The effects of miR-127 expression on malignant phenotypes of BC cells and its possible molecular mechanisms were further determined. miR-127 was significantly downregulated in BC tissues, and low miR-127 expression was significantly correlated with lymph node metastasis and advanced clinical stage. Patients with low miR-127 showed poorer overall survival than those with high miR-127. Multivariate analyses indicated that status of miR-127 was an independent prognostic factor for patients. Functional analyses showed that upregulation of miR-127 significantly inhibited growth, enhanced apoptosis, and reduced migration and invasion in BC cells by targeting the protooncogene BCL-6. Therefore, miR-127 may be a potential biomarker for predicting the survival of BC patients and might be a molecular target for treatment of human BCs.

Zhou J, Lu S, Yang S, et al.
MicroRNA-127 post-transcriptionally downregulates Sept7 and suppresses cell growth in hepatocellular carcinoma cells.
Cell Physiol Biochem. 2014; 33(5):1537-46 [PubMed] Related Publications
BACKGROUND/AIMS: Hepatocellular carcinoma is one of the most common cancers worldwide. It has been suggested that microRNAs, a class of small regulatory RNAs, are associated with tumorigenesis by targeting the mRNAs of hundreds of genes that modulate a variety of biological processes, including cellular differentiation, apoptosis, metabolism, and proliferation.
METHODS/RESULTS: we analyzed the expression levels of mir-127 in 33 HCC and non-cancerous tissues using qRT-PCR. MiR-127 is downregulated in 69.7% of HCC tissues compared with adjacent normal tissues, but its expression level is not correlated with the TNM stage, AFP level, or age. In vitro, miR-127 can arrest Huh7 at the G2/M phase and inhibit Huh7 cell proliferation. In an in vivo xenograft model, the overexpression of miR-127 can inhibit Huh7 cell tumorigenicity. The luciferase reporter and western blot results confirm that miR-127 downregulates Sept7 expression by targeting its 3'UTR. Furthermore, the knockdown of Sept7 has the same effect on cell proliferation as the overexpression of miR-127 in Huh7 cells.
CONCLUSION: miR-127 plays a tumor-suppressor role and can serve as a potential diagnostic biomarker for HCC.

Tan W, Gu J, Huang M, et al.
Epigenetic analysis of microRNA genes in tumors from surgically resected lung cancer patients and association with survival.
Mol Carcinog. 2015; 54 Suppl 1:E45-51 [PubMed] Free Access to Full Article Related Publications
Aberrant microRNA (miRNA) expression is involved in tumorigenesis of several cancers, including non-small cell lung cancer (NSCLC). Furthermore, expression of some miRNAs has been shown to be under epigenetic regulation. However, less is known regarding the role of miRNA methylation in NSCLC development or clinical outcomes. Therefore, we tested miRNA methylation patterns by quantitative real-time methylation-specific PCR for a panel of candidate miRNAs in 19 NSCLC paired tumor and adjacent normal tissues. For assessment of survival, methylation was measured in a total of 97 tumor tissues with complete clinical and follow-up data. Analysis was also performed for correlation with age at diagnosis, gender, smoking, and stage. Significant differences in methylation patterns were observed for 9 of the 12 miRNAs, all due to hypermethylation in the tumor tissue. Individuals with the highest levels of methylated miR-127 were at a significantly increased risk of dying with a hazard ratio of 1.93 (95% CI 1.17-3.19; P = 0.010), in univariate analysis and remained significant after adjusting for age, gender, and stage (HR 1.97; 95% CI 1.15-3.40; P = 0.014). This increase in risk due to increased methylation were accompanied by significant, dramatic difference in survival duration of 17 months (P = 0.0089). Six of the 12 miRNAs were significantly positively correlated with age at diagnosis. Additionally, methylation of miR-127 was significantly greater in higher stage tumors compared to lower stage tumors (P = 0.0039). However, no significant associations between smoking and gender with miRNA methylation were observed. Our results demonstrate that miRNA methylation plays a role in NSCLC tumorigenesis and prognosis.

Jiang H, Hua D, Zhang J, et al.
MicroRNA-127-3p promotes glioblastoma cell migration and invasion by targeting the tumor-suppressor gene SEPT7.
Oncol Rep. 2014; 31(5):2261-9 [PubMed] Related Publications
MicroRNAs (miRNAs) are small non-coding RNAs of 20-25 nucleotides in length that are capable of modulating gene expression post-transcriptionally. The potential roles of miRNAs in the tumorigenesis of glioblastoma (GBM) have been under intensive studies in the past few years. In the present study, we found a positive correlation between the levels of miR-127-3p and the cell migration and invasion abilities in several human GBM cell lines. We showed that miR-127-3p promoted cell migration and invasion of GBM cells using in vitro cell lines and in vivo mouse models. We identified SEPT7, a known tumor-suppressor gene that has been reported to suppress GBM cell migration and invasion, as a direct target of miR-127-3p. SEPT7 was able to partially abrogate the effect of miR-127-3p on cell migration and invasion. In addition, microarray analysis revealed that miR-127-3p regulated a number of migration and invasion-related genes. Finally, we verified that miR-127-3p affected the remodeling of the actin cytoskeleton mediated by SEPT7 in GBM cells.

Jiang H, Jin C, Liu J, et al.
Next generation sequencing analysis of miRNAs: MiR-127-3p inhibits glioblastoma proliferation and activates TGF-β signaling by targeting SKI.
OMICS. 2014; 18(3):196-206 [PubMed] Free Access to Full Article Related Publications
Glioblastoma (GBM) proliferation is a multistep process during which the expression levels of many genes that control cell proliferation, cell death, and genetic stability are altered. MicroRNAs (miRNAs) are emerging as important modulators of cellular signaling, including cell proliferation in cancer. In this study, using next generation sequencing analysis of miRNAs, we found that miR-127-3p was downregulated in GBM tissues compared with normal brain tissues; we validated this result by RT-PCR. We further showed that DNA demethylation and histone deacetylase inhibition resulted in downregulation of miR-127-3p. We demonstrated that miR-127-3p overexpression inhibited GBM cell growth by inducing G1-phase arrest both in vitro and in vivo. We showed that miR-127-3p targeted SKI (v-ski sarcoma viral oncogene homolog [avian]), RGMA (RGM domain family, member A), ZWINT (ZW10 interactor, kinetochore protein), SERPINB9 (serpin peptidase inhibitor, clade B [ovalbumin], member 9), and SFRP1 (secreted frizzled-related protein 1). Finally, we found that miR-127-3p suppressed GBM cell growth by inhibiting tumor-promoting SKI and activating the tumor suppression effect of transforming growth factor-β (TGF-β) signaling. This study showed, for the first time, that miR-127-3p and its targeted gene SKI, play important roles in GBM and may serve as potential targets for GBM therapy.

Chen J, Wang M, Guo M, et al.
miR-127 regulates cell proliferation and senescence by targeting BCL6.
PLoS One. 2013; 8(11):e80266 [PubMed] Free Access to Full Article Related Publications
Cellular senescence occurs as a response to extracellular and intracellular stresses and contributes to aging and age-related pathologies. Emerging evidence suggests that cellular senescence also acts as a potent tumor suppression mechanism that prevents the oncogenic transformation of primary human cells. Recent reports have indicated that miRNAsact as key modulators of cellular senescence by targeting critical regulators of the senescence pathways. We previously reported that miR-127 is up-regulated in senescent fibroblasts. In this report, we identified miR-127 as a novel regulator of cellular senescence that directly targets BCL6. We further showed that miR-127 is down-regulated in breast cancer tissues and that this down-regulation is associated with up-regulation of BCL6. Over-expression of miR-127 or depletion of BCL6 inhibits breast cancer cell proliferation. Our data suggest that miR-127 may function as a tumor suppressor that modulates the oncogene BCL6.

Cuk K, Zucknick M, Madhavan D, et al.
Plasma microRNA panel for minimally invasive detection of breast cancer.
PLoS One. 2013; 8(10):e76729 [PubMed] Free Access to Full Article Related Publications
Over the last few years, circulating microRNAs (miRNAs) have emerged as promising novel and minimally invasive markers for various diseases, including cancer. We already showed that certain miRNAs are deregulated in the plasma of breast cancer patients when compared to healthy women. Herein we have further explored their potential to serve as breast cancer early detection markers in blood plasma. Circulating miR-127-3p, miR-376a and miR-652, selected as candidates from a miRNA array-based screening, were found to be associated with breast cancer for the first time (n = 417). Further we validated our previously reported circulating miRNAs (miR-148b, miR-376c, miR-409-3p and miR-801) in an independent cohort (n = 210) as elevated in the plasma of breast cancer patients compared to healthy women. We described, for the first time in breast cancer, an over-representation of deregulated miRNAs (miR-127-3p, miR-376a, miR-376c and miR-409-3p) originating from the chromosome 14q32 region. The inclusion of patients with benign breast tumors enabled the observation that miR-148b, miR-652 and miR-801 levels are even elevated in the plasma of women with benign tumors when compared to healthy controls. Furthermore, an analysis of samples stratified by cancer stage demonstrated that miR-127-3p, miR-148b, miR-409-3p, miR-652 and miR-801 can detect also stage I or stage II breast cancer thus making them attractive candidates for early detection. Finally, ROC curve analysis showed that a panel of these seven circulating miRNAs has substantial diagnostic potential with an AUC of 0.81 for the detection of benign and malignant breast tumors, which further increased to 0.86 in younger women (up to 50 years of age).

Zhao X, Duan Z, Liu X, et al.
MicroRNA-127 is downregulated by Tudor-SN protein and contributes to metastasis and proliferation in breast cancer cell line MDA-MB-231.
Anat Rec (Hoboken). 2013; 296(12):1842-9 [PubMed] Related Publications
Tudor-SN is a multifunctional protein that is highly expressed in multiple cancers including breast cancer. Tudor-SN, as a component in RNA-induced splicing complex, was recently reported to regulate gene expression in a microRNA (miRNA)-dependent manner, such as let-7, miR-34a and miR-221. However, how Tudor-SN is associated with cancer development still remains largely elusive. In the present study, we explored the role of Tudor-SN in breast cancer. Stable knockdown of endogenous Tudor-SN, performed on the breast cancer cell line MDA-MB-231 by small hairpin RNA expression vectors, suppressed the in vitro migration and invasion ability of the metastatic breast cancer cell line. Interestingly, we found Tudor-SN as a miRNA regulator according to microarray analysis, and further identified that Tudor-SN negatively regulated the expression of miR-127, and consequently increased the expression of the proto-oncogene BCL6 which was a convincing target of miR-127. Moreover, overexpression of miR-127 reduced the in vitro migration and proliferation ability of breast cancer cell MDA-MB-231. Collectively, our results suggested a novel mechanism that Tudor-SN promoted metastasis and proliferation of breast cancer cells via downregulating the miR-127 expression.

Xu Y, Luo S, Liu Y, et al.
Integrated gene network analysis and text mining revealing PIK3R1 regulated by miR-127 in human bladder cancer.
Eur J Med Res. 2013; 18:29 [PubMed] Free Access to Full Article Related Publications
BACKGROUND: Cancer is the result of a complex multistep process that involves the accumulation of sequential alterations of several genes, including those encoding microRNAs (miRNAs) that have critical roles in the regulation of gene expression.In this study, we aimed to predict potential mechanisms of bladder cancer related miRNAs and target genes by bioinformatics analyses.
METHODS: Here we used the method of text mining to identify nine miRNAs in bladder cancer and adopted protein-protein interaction analysis to identify interaction sites between these miRNAs and related-target genes.
RESULTS: There are two relationship types between bladder cancer and its related miRNAs: causal and unspecified. The Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment test showed that there were three pathways related to four miRNA targeted genes. The remaining five miRNAs annotated to disease are not enriched in the KEGG pathways. Of these, PIK3R1 is the overlapping gene among 38 genes in the cancer and bladder cancer pathways.
CONCLUSIONS: These findings provide new insights into the role of miRNAs in the pathway of cancer and give us a hypothesis that miR-127 might play a similar role in regulation and control of PIK3R1.

Yang Z, Tsuchiya H, Zhang Y, et al.
MicroRNA-433 inhibits liver cancer cell migration by repressing the protein expression and function of cAMP response element-binding protein.
J Biol Chem. 2013; 288(40):28893-9 [PubMed] Free Access to Full Article Related Publications
We show for the first time that potent microRNA-433 (miR-433) inhibition of expression of the cAMP response element-binding protein CREB1 represses hepatocellular carcinoma (HCC) cell migration. We identified a miR-433 seed match region in human and mouse CREB1 3'-UTRs. Overexpression of miR-433 markedly decreased human CREB1 3'-UTR reporter activity, and the inhibitory effect of miR-433 was alleviated upon mutation of its binding site. Ectopic expression of miR-433 reduced CREB1 protein levels in a variety of human and mouse cancer cells, including HeLa, Hepa1, Huh7, and HepG2. Human CREB1 protein levels in highly invasive MHCC97H cells were diminished by expression of miR-433 but were induced by miR-433 antagomir (anti-miR-433). The expression of mouse CREB1 protein negatively correlated with miR-433 levels in nuclear receptor Shp(-/-) liver tissues and liver tumors compared with wild-type mice. miR-433 exhibited a significant repression of MHCC97H cell migration, which was reversed by anti-miR-433. Overexpressing miR-433 inhibited focus formation dramatically, demonstrating that miR-433 may exert a tumor suppressor function. Knockdown of CREB1 by siRNAs impeded MHCC97H cell migration and invasion and antagonized the effect of anti-miR-433. Interestingly, CREB1 siRNA decreased MHCC97H cell proliferation, which was not influenced by anti-miR-433. Overexpressing CREB1 decreased the inhibitory activity of miR-433. The CpG islands surrounding miR-433 were hypermethylated, and the DNA methylation agent 5'-aza-2'-deoxycytidine, but not the histone deacetylase inhibitor trichostatin A, drastically stimulated the expression of miR-433 and miR-127 in HCC cells. The latter is clustered with miR-433. The results reveal a critical role of miR-433 in mediating HCC cell migration via CREB1.

Guo LH, Li H, Wang F, et al.
The Tumor Suppressor Roles of miR-433 and miR-127 in Gastric Cancer.
Int J Mol Sci. 2013; 14(7):14171-84 [PubMed] Free Access to Full Article Related Publications
The discovery of microRNAs (miRNAs) provides a new and powerful tool for studying the mechanism, diagnosis and treatment of human cancers. Currently, the methylation epigenetic silencing of miRNAs with tumor suppressor features by CpG island hypermethylation is emerging as a common hallmark of different tumors. Here we showed that miR-433 and miR-127 were significantly down-regulated in gastric cancer (GC) tissues compared with the adjacent normal regions in 86 paired samples. Moreover, the lower level of miR-433 and miR-127 was associated with pM or pTNM stage in clinical gastric cancer patients. The restored expression of miR-433 and miR-127 in GC cells upon 5-Aza-CdR and TSA treatment suggested the loss of miR-433 and miR-127 was at least partly regulated by epigenetic modification in GC. Furthermore, the ectopic expression of miR-433 and miR-127 in gastric cancer cell lines HGC-27 inhibits cell proliferation, cell cycle progression, cell migration and invasion by directly interacting with the mRNA encoding oncogenic factors KRAS and MAPK4 respectively. Taken together, our results showed that miR-433 and miR-127 might act as tumor suppressors in GC, and it may provide novel diagnostic and therapeutic options for human GC clinical operation in the near future.

Goswami RS, Atenafu EG, Xuan Y, et al.
MicroRNA signature obtained from the comparison of aggressive with indolent non-Hodgkin lymphomas: potential prognostic value in mantle-cell lymphoma.
J Clin Oncol. 2013; 31(23):2903-11 [PubMed] Related Publications
PURPOSE: Mantle-cell lymphoma (MCL) has a variable natural history but is incurable with current therapies. MicroRNAs (miRs) are useful in prognostic assessment of cancer. We determined an miR signature defining aggressiveness in B-cell non-Hodgkin lymphomas (NHL) and assessed whether this signature aids in MCL prognosis.
METHODS: We assessed miR expression in a training set of 43 NHL cases. The miR signature was validated in 44 additional cases and examined on a training set of 119 MCL cases from four institutions in Canada. miRs significantly associated with overall survival were examined in an independent cohort of 114 MCL cases to determine association with patient outcome. miR expression was combined with current clinical prognostic factors to develop an enhanced prognostic model in patients with MCL.
RESULTS: Fourteen miRs were differentially expressed between aggressive and indolent NHL; 11 of 14 were validated in an independent set of NHL (excluding MCL). miR-127-3p and miR-615-3p were significantly associated with overall survival in the MCL training set. Their expression was validated in an independent MCL patient set. In comparison with Ki-67, expression of these miRs was more significantly associated with overall survival among patients with MCL. miR-127-3p was combined with Ki-67 to create a new prognostic model for MCL. A similar model was created with miR-615-3p and Mantle Cell Lymphoma International Prognostic Index scores.
CONCLUSION: Eleven miRs are differentially expressed between aggressive and indolent NHL. Two novel miRs were associated with overall survival in MCL and were combined with clinical prognostic models to generate novel prognostic data for patients with MCL.

Munagala R, Aqil F, Vadhanam MV, Gupta RC
MicroRNA 'signature' during estrogen-mediated mammary carcinogenesis and its reversal by ellagic acid intervention.
Cancer Lett. 2013; 339(2):175-84 [PubMed] Free Access to Full Article Related Publications
Dysregulated miRNA expression has been associated with the development and progression of cancers, including breast cancer. The role of estrogen (E2) in regulation of cell proliferation and breast carcinogenesis is well-known. Recent reports have associated several miRNAs with estrogen receptors in breast cancers. Investigation of the regulatory role of miRNAs is critical for understanding the effect of E2 in human breast cancer, as well as developing strategies for cancer chemoprevention. In the present study we used the well-established ACI rat model that develops mammary tumors upon E2 exposure and identified a 'signature' of 33 significantly modulated miRNAs during the process of mammary tumorigenesis. Several of these miRNAs were altered as early as 3 weeks after initial E2 treatment and their modulation persisted throughout the mammary carcinogenesis process, suggesting that these molecular changes are early events. Furthermore, ellagic acid, which inhibited E2-induced mammary tumorigenesis in our previous study, reversed the dysregulation of miR-375, miR-206, miR-182, miR-122, miR-127 and miR-183 detected with E2 treatment and modulated their target proteins (ERα, cyclin D1, RASD1, FoxO3a, FoxO1, cyclin G1, Bcl-w and Bcl-2). This is the first systematic study examining the changes in miRNA expression associated with E2 treatment in ACI rats as early as 3 week until tumor time point. The effect of a chemopreventive agent, ellagic acid in reversing miRNAs modulated during E2-mediated mammary tumorigenesis is also established. These observations provide mechanistic insights into the new molecular events behind the chemopreventive action of ellagic acid and treatment of breast cancer.

Yang Z, Zhang Y, Wang L
A feedback inhibition between miRNA-127 and TGFβ/c-Jun cascade in HCC cell migration via MMP13.
PLoS One. 2013; 8(6):e65256 [PubMed] Free Access to Full Article Related Publications
Hepatocellular carcinoma (HCC) is the fifth most common cancer worldwide and is increasing in frequency in the U.S. The major reason for the low postoperative survival rate of HCC is widespread intrahepatic metastasis or invasion, and activation of TGFβ signaling is associated with the invasive phenotype. This study aims at determining the novel function of miR-127 in modulating HCC migration. Overexpression of miR-127 inhibits HCC cell migration, invasion and tumor growth in nude mice. MiR-127 directly represses matrix metalloproteinase 13 (MMP13) 3'UTR activity and protein expression, and diminishes MMP13/TGFβ-induced HCC migration. In turn, TGFβ decreases miR-127 expression by enhancing c-Jun-mediated inhibition of miR-127 promoter activity. In contrast, p53 transactivates miR-127 promoter and induces miR-127 expression, which is antagonized by c-Jun. The inhibition of miR-127 by c-Jun is through TGFβ-mediated ERK and JNK pathways. The lower miR-127 expression shows a negative correlation with the higher MMP13 expression in a subset of human HCC specimens. This is the first report elucidating a feedback regulation between miR-127 and the TGFβ/c-Jun cascade in HCC migration via MMP13 that involves a crosstalk between the oncogene c-Jun and tumor suppressor p53.

Ahmed FE, Ahmed NC, Vos PW, et al.
Diagnostic microRNA markers to screen for sporadic human colon cancer in stool: I. Proof of principle.
Cancer Genomics Proteomics. 2013 May-Jun; 10(3):93-113 [PubMed] Related Publications
To present proof-of-principle application for employing micro(mi)RNAs as diagnostic markers for colon cancer, we carried out global microarray expression studies on stool samples obtained from fifteen individuals (three controls, and three each with TNM stage 0-1, stage 2, stage 3, and stage 4 colon cancer), using Affymetrix GeneChip miRNA 3.0 Array, to select for a panel of miRNA genes for subsequent focused semi-quantitative polymerase chain reaction (PCR) analysis studies. Microarray results showed 202 preferentially expressed miRNA genes that were either increased (141 miRNAs), or reduced (61 miRNAs) in expression. We then conducted a stem-loop reverse transcriptase (RT)-TaqMan® minor groove binding (MGB) probes, followed by a modified qPCR expression study on 20 selected miRNAs. Twelve of the miRNAs exhibited increased and 8 decreased expression in stool from 60 individuals (20 controls, 20 with tumor-lymph node-metastatic (TNM) stage 0-1, 10 with stage 2, five with stage 3, and 5 with stage 4 colon cancer) to quantitatively monitor miRNA changes at various TNM stages of colon cancer progression. We also used laser-capture microdissection (LCM) of colon mucosal epithelial tissue samples (three control samples, and three samples from each of the four stages of colon cancer, for a total of 15 samples) to find concordance or lack thereof with stool findings. The reference housekeeping pseudogene-free ribosomal gene (18S rRNA), which shows little variation in expression, was employed as a normalization standard for relative PCR quantification. Results of the PCR analyses confirmed that twelve miRNAs (miR-7, miR-17, miR-20a, miR-21, miR-92a, miR-96, miR-106a, miR-134, miR-183, miR-196a, miR-199a-3p and miR214) had an increased expression in the stool of patients with colon cancer, and that later TNM carcinoma stages exhibited a more pronounced expression than did adenomas. On the other hand, eight miRNAs (miR-9, miR-29b, miR-127-5p, miR-138, miR-143, miR-146a, miR-222 and miR-938) had decreased expression in the stool of patients with colon cancer, which was also more pronounced from early to later TNM stages. Results from colon mucosal tissues were similar to those from stool samples, although with more apparent changes in expression. Cytological studies on purified stool colonocytes that employed Giemsa staining showed 80% sensitivity for detecting tumor cells in stool smears. The performance characteristics of the test confirmed that stool is a medium well-suited for colon cancer screening, and that the quantitative changes in the expression of few mature miRNA molecules in stool associated with colon cancer progression provided for more sensitive and specific non-invasive diagnostic markers than tests currently available on the market. Thus, a larger prospective and properly randomized validation study of control individuals and patients exhibiting various stages of colon cancer progression (TNM stages 0-IV) is now needed in order to standardize test conditions, and provide a means for determining the true sensitivity and specificity of a miRNA screening approach in stool for the non-invasive detection of colon cancer, particularly at an early stage (0-I). Eventually, we will develop a chip to enhance molecular screening for colon cancer, as has been accomplished for the detection of genetically-modified organisms (GMOs) in foods.

Qu J, Zhao L, Zhang P, et al.
MicroRNA-195 chemosensitizes colon cancer cells to the chemotherapeutic drug doxorubicin by targeting the first binding site of BCL2L2 mRNA.
J Cell Physiol. 2015; 230(3):535-45 [PubMed] Related Publications
The mechanisms underlying doxorubicin (Dox) resistance in colon cancer cells are not fully understood. MicroRNA (miRNA) play important roles in tumorigenesis and drug resistance. However, the relationship between miRNA and Dox resistance in colon cancer cells has not been previously explored. In this study, we utilized microRNA array and real-time PCR to verify that miR-127, miR-195, miR-22, miR-137 were significantly down-regulated, while miR-21, miR-592 were up-regulated in both HT29/DOX and LOVO/DOX cell lines. In vitro cell viability assay showed that knockdown of miR-195 in HT29 and LOVO cells caused a marked inhibition of Dox-induced cytotoxicity. Moreover, we explored that miR-195 is involved in repression of BCL2L2 expression through targeting its 3'-untranslated region, especially the first binding site within its mRNA. Furthermore, down-regulation of miR-195 conferred DOX resistance in parental cells and reduced cell apoptosis activity, while over-expression of miR-195 sensitized resistant cells to DOX and enhanced cell apoptosis activity, all of which can be partly rescued by BCL2L2 siRNA and cDNA expression. These results may have implications for therapeutic strategies aiming to overcome colon cancer cell resistance to Dox.

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Cite this page: Cotterill SJ. MicroRNA miR-127-3p, Cancer Genetics Web: http://www.cancer-genetics.org/MIR127.htm Accessed:

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