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Knockdown of circ_0000512 Inhibits Cell Proliferation and Promotes Apoptosis in Colorectal Cancer by Regulating miR-296-5p/RUNX1 Axis

Authors Wang L, Wu H, Chu F, Zhang L, Xiao X

Received 19 February 2020

Accepted for publication 3 July 2020

Published 28 July 2020 Volume 2020:13 Pages 7357—7368


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Federico Perche

Lihong Wang, Huili Wu, Feifei Chu, Li Zhang, Xingguo Xiao

Department of Gastroenterology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou 450000, Henan, People’s Republic of China

Correspondence: Huili Wu Email

Background: Colorectal cancer (CRC) is one of the leading causes of cancer-related death worldwide. Increasing evidence showed that circular RNAs (circRNAs) played critical roles in the progression of CRC. However, the effects and underlying mechanisms of circ_0000512 in CRC progression remain unclear.
Methods: The expression levels of circ_0000512, microRNA-296-5p (miR-296-5p) and runt-related transcription factor 1 (RUNX1) were analyzed by quantitative real-time polymerase chain reaction (qRT-PCR). Cell viability, colony formation, cell cycle distribution and cell apoptosis were detected by Cell Counting Kit-8 (CCK-8) assay, colony formation assay and flow cytometry analysis, respectively. Western blot assay was utilized to measure the protein expression of Cyclin D1, Cleaved Caspase-3 and RUNX1. The interaction between miR-296-5p and circ_0000512 or RUNX1 was predicted by starBase and verified by dual-luciferase reporter assay, RNA immunoprecipitation (RIP) assay and RNA pull-down assay. The mice xenograft model was established to explore the function of circ_0000512 in vivo.
Results: The expression of circ_0000512 was increased in CRC tissues and cells. Knockdown of circ_0000512 suppressed cell viability and colony formation and arrested the cells at the G0/G1 phase while it accelerated apoptosis in CRC cells. Mechanistically, circ_0000512 could increase RUNX1 expression by acting as a molecular sponge of miR-296-5p in CRC cells. Furthermore, miR-296-5p downregulation or RUNX1 overexpression reversed the anti-proliferation and pro-apoptosis effects caused by circ_0000512 knockdown in CRC cells. In addition, circ_0000512 interference inhibited tumor growth by upregulating miR-296-5p and downregulating RUNX1 in vivo.
Conclusion: Knockdown of circ_0000512 inhibited cell proliferation and induced apoptosis in CRC cell by regulating miR-296-5p/RUNX1 axis, which might provide a potential therapeutic target for CRC treatment.

Keywords: colorectal cancer, circ_0000512, -miR-296-5p, RUNX1, proliferation, apoptosis

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