Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MARKERS
Volume 36, Issue 3, Pages 3-13Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/17246008211034178
Keywords
Colorectal cancer; circ_0006174; microRNA-142-3p; X-linked inhibitor of apoptosis
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Funding
- Cultivation Fund of the National Natural Science Foundation [[2018]5764-11]
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The study revealed that circ_0006174 is up-regulated in colorectal cancer tissues and cells, promoting cancer cell proliferation, migration, and invasion while inhibiting apoptosis by regulating the microRNA-142-3p/X-linked inhibitor of apoptosis axis.
Background Circular RNAs (circRNAs) are crucial in the regulation of gene expression and biological processes. However, in colorectal cancer, the expression characteristics and biological function of circRNA_0006174 (circ_0006174) is not fully understood. This work is aimed to investigate the biological function of circ_0006174 in colorectal cancer and its molecular mechanism. Methods Circ_0006174, microRNA-142-3p and X-linked inhibitor of apoptosis expression levels were detected in colorectal cancer tissues and cells using quantitative real-time polymerase chain reaction analysis or Western blot. The effects of circ_0006174 on colorectal cancer cell proliferation, apoptosis, migration and invasion were detected using the cell counting kit-8 method, bromodeoxyuridine experiments, flow cytometry analysis and Transwell experiments. The targeting relationship among circ_0006174, microRNA-142-3p and X-linked inhibitor of apoptosis was analysed by bioinformatics prediction, dual-luciferase reporter experiment and RNA immunoprecipitation experiment. Results Circ_0006174 was up-regulated in colorectal cancer tissues as well as in cell lines, and its high expression was remarkably associated with enlarged tumour volume and advanced tumour, node, metastasis stage of the patients. Circ_0006174 overexpression enhanced colorectal cancer cell proliferation, migration and invasion, and inhibited colorectal cancer cell apoptosis; while knocking down circ_0006174 caused the opposite effects. Circ_0006174 directly targeted and negatively regulated microRNA-142-3p expression, and X-linked inhibitor of apoptosis, a target gene of microRNA-142-3p, could be indirectly and positively modulated by circ_0006174. Conclusion Circ_0006174 facilitates colorectal cancer cell proliferation, migration and invasion, and represses colorectal cancer cell apoptosis by regulating microRNA-142-3p/X-linked inhibitor of apoptosis axis.
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