Silencing lncRNA XIST exhibits antiproliferative and proapoptotic effects on gastric cancer cells by up-regulating microRNA-132 and down-regulating PXN

• Published in: Aging (Albany, NY.) Vol. 13; no. 10; pp. 14469 - 14481
• Main Authors: Li, Ping, Wang, Liuhua, Li, Pengfei, Hu, Fangyong, Cao, Yi, Tang, Dong, Ye, Gang, Li, Hongbo, Wang, Daorong
• Format: Journal Article
• Language: English
• Published: United States Impact Journals 05.11.2020
• Subjects: Adult; Aged; Aged, 80 and over; Animals; Apoptosis - genetics; Cell Line, Tumor; Cell Proliferation - genetics; Down-Regulation; Female; Gastrectomy; Gene Expression Regulation, Neoplastic; Gene Knockdown Techniques; Humans; Male; Mice; MicroRNAs - metabolism; Middle Aged; Paxillin - genetics; Research Paper; RNA, Long Noncoding - genetics; RNA, Long Noncoding - metabolism; Stomach - pathology; Stomach - surgery; Stomach Neoplasms - genetics; Stomach Neoplasms - pathology; Stomach Neoplasms - surgery; Up-Regulation; Xenograft Model Antitumor Assays; paxillin; MicroRNA-132; gastric cancer; proliferation; long non-coding RNA XIST
• ISSN: 1945-4589; 1945-4589
• DOI: 10.18632/aging.103635

The present study aims to elucidate the potential therapeutic role of lncRNA XIST in gastric cancer through regulation of microRNA-132 (miR-132) and paxillin (PXN) expression. The study employed 65 gastric cancer tissue specimens and SGC7901 cell lines. Our results demonstrated that expression of lncRNA XIST and PXN was significantly elevated while the expression of miR-132 was significantly reduced in gastric cancer tissues. Dual-luciferase, RNA pull-down and RIP assays demonstrated that lncRNA XIST up-regulated the PXN expression by competitively binding to miR-132. Moreover, silencing of lncRNA XIST and up-regulation of miR-132 could suppress tumor formation ability, cell proliferation and migration, but enhanced apoptosis in gastric cancer. However, the overexpression of PXN achieved the opposite tumor-promotive effect. Meanwhile, rescue experiments suggested that silencing of lncRNA XIST could reverse the tumor-promotive effect exerted by either miR-132 inhibitor or PXN. Taken together, the present study demonstrates lncRNA XIST as a novel oncogenic lncRNA in gastric cancer, highlighting its therapeutic role in this disease.