Downregulation of miR-145-5p in cancer cells�and their�derived exosomes may contribute to�the�development of ovarian cancer by targeting CT

Abstract

The present study aimed to identify shared microRNAs (miRNAs) in ovarian cancer (OC) cells and their exosomes using microarray data (accession number GSE103708) available from the Gene Expression Omnibus database, including exosomal samples from 13 OC cell lines and 3 normal ovarian surface epithelial cell lines, and their original cell samples. Differentially expressed miRNAs (DE-miRNAs) were identified using the Linear Models for Microarray data method, and mRNA targets of DE-miRNAs were predicted using the miRWalk2 database. The potential functions of target genes were analyzed using Database for Annotation, Visualization and Integrated Discovery and intersected with known OC-associated pathways downloaded from the Comparative Toxicogenomics Database. The associations between crucial miRNAs and target genes, and their clinical associations, were validated using data from The Cancer Genome Atlas. As a result, 16 upregulated and 6 downregulated DE-miRNAs were shared in OC cell lines and their exosomes compared with normal controls. The target genes of 11 common DE-miRNAs were predicted. Among these DE-miRNAs, a low expression of homosapiens (hsa)-miR-145-5p was significantly correlated with a poor prognosis and higher stages. Although 91 target genes were predicted for hsa-miR-145-5p, only 4 genes [connective tissue growth factor (CTGF), myotubularin-related protein 14, protein phosphatase 3 catalytic subunit alpha and suppressor of cytokine signaling 7] were suggested as risk factors for prognosis. The subsequent Pearson’s correlation analysis validated a significant negative correlation between hsa-miR-145-5p and CTGF (r=−0.1126, P=0.02188). According to the results of the functional analysis, CTGF is involved in the Hippo signaling pathway (hsa04390). In conclusion, decreased expression of hsa-miR-145 in OC and OC-derived exosomes may be a crucial biomarker for the diagnosis and treatment of OC.

Tumor‐derived exosomal miRNA‐320d as a biomarker for metastatic colorectal cancer

“…4 Recent evidence indicated that exosomes act as a diagnostic biomarker in lung cancer, 5 ovarian cancer, 6 and pancreatic cancer. 4 Recent evidence indicated that exosomes act as a diagnostic biomarker in lung cancer, 5 ovarian cancer, 6 and pancreatic cancer.…”

“…fusion with the cell membrane. 4 Recent evidence indicated that exosomes act as a diagnostic biomarker in lung cancer, 5 ovarian cancer, 6 and pancreatic cancer. 7 Exosomes have been implicated in the tumor metastatic process to normal tissues via the transfer of cancer-specific cargo (ie, microRNA, RNAs and proteins), 8 one of which the most exciting molecular marker for tumor diagnosis is microRNA (miRNA).…”

Slow-Freezing Cryopreservation Ensures High Ovarian Tissue Quality Followed by In Vivo and In Vitro Methods and Is Safe for Fertility Preservation

“…Another miRNA involved in many processes is miR–145. It participates in primordial follicle development and maintenance in mice [ 44 ], has higher expression levels in the follicular stage than the luteal stage in sheep experiments [ 45 ], or suppresses colorectal cancer cell viability and proliferation [ 46 ], but when downregulated, it enhances oocyte maturation and cell survival [ 47 ] or might serve as an ovarian cancer biomarker [ 39 , 48 ]. MiR–146 is reported to control reproductive functions by inhibiting the release of ovarian progesterone [ 49 ], whereas the downregulation of miR–146b–3p expression suppresses the proliferation and migration of cervical cancer cells [ 50 ].…”

Diagnostic value of circular RNAs in female reproductive system diseases: A PRISMA‑compliant meta‑analysis

“…The lack of an effective molecular biomarker for diagnosing early stage ovarian cancer is a key contributor to its overall poor prognosis (27). Lastly, tissue-extracted circRNAs may not be the ideal biomarker considering that circRNAs are also stable and abundant in exosomes (28,29). The detection of circRNAs from exosomes in plasma or serum may be a better alternative in diagnosing disease.…”