期刊
ONCOLOGY REPORTS
卷 45, 期 4, 页码 -出版社
SPANDIDOS PUBL LTD
DOI: 10.3892/or.2021.7963
关键词
exosome; transforming growth factor-β 1; miR-663b; mannoside acetylglucosaminyltransferase 3; epithelial-mesenchymal transition; cervical cancer
类别
资金
- Shandong Provincial Key Research Project [2017CXGC1210, 2019GSF108126]
- National Natural Science Foundation of China (NSFC) [81572559, 81902644]
- Natural Science Doctoral Program Foundation of Shandong Province [ZR2019BC059]
- Health Commission of Weifang [wfwsjs-2018-053]
This study revealed that TGF-beta 1 stimulates cervical cancer cells to release exosomes containing miR-663b, which promotes metastasis. MiR-663b directly targets MGAT3 and is involved in the EMT process that affects cancer cell migration and invasion.
Transforming growth factor (TGF)-beta 1 is a key cytokine affecting the pathogenesis and progression of cervical cancer. Tumor-derived exosomes contain microRNAs (miRNAs/miRs) that interact with cancer and stromal cells, thereby contributing to tissue remodeling in the tumor microenvironment (TME). The present study was designed to clarify how TGF-beta 1 affects tumor biological functions through exosomes released by cervical cancer cells. Deep RNA sequencing found that TGF-beta 1 stimulated cervical cancer cells to secrete more miR-663b-containing exosomes, which could be transferred into new target cells to promote metastasis. Further studies have shown that miR-663b directly targets the 3 '-untranslated regions (3 '-UTR) of mannoside acetylglucosaminyltransferase 3 (MGAT3) and is involved in the epithelial-mesenchymal transition (EMT) process. Remarkably, the overexpression of MGAT3 suppressed cervical cancer cell metastasis promoted by exosomal miR-663b, causing increased expression of epithelial differentiation marker E-cadherin and decreased expression of mesenchymal markers N-cadherin and beta-catenin. Throughout our study, online bioinformation tools and dual luciferase reporter assay were applied to identify MGAT3 as a novel direct target of miR-663b. Exosome PKH67-labeling experiment verified that exosomal miR-663b could be endocytosed by cervical cancer cells and subsequently influence its migration and invasion functions which were measured by wound healing and Transwell assays. The expression of miR-663b and MGAT3 and the regulation of the EMT pathway caused by MGAT3 were detected by quantitative real-time transcription-polymerase chain reaction (qPCR) and western blot analysis. These results, thus, provide evidence that cancer cell-derived exosomal miR-663b is endocytosed by cervical cancer cells adjacent or distant after TGF-beta 1 exposure and inhibits the expression of MGAT3, thereby accelerating the EMT process and ultimately promoting local and distant metastasis.
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