Abstract
Background：Gastric cancer (GC) is one of the most principle malignant cancers in the digestive system. Moreover, the critical role of circular RNAs (circRNAs) has been identified in GC development. Methods：In this context, the purpose of research was to explore the regulatory mechanism circ_0001013, a novel circRNAs predicted by our research, in GC. The differential circRNAs and related mechanism in GC were predicted by microarray analysis. Circ_0001013, miR-136, and TWSG1 expression in GC clinical samples and cells was detected by RT-qPCR. The relationship among circ_0001013, miR-136, and TWSG was assessed by dual-luciferase reporter assay, biotin coupled probe pull-down assay, and biotin coupled miRNA capture. After gain- and loss-of-function assays in GC cells, cell proliferation, migration, invasion, and cell cycle and apoptosis were measured by EdU assay, scratch test, Transwell assay, and flow cytometry respectively. The effect of circ_0001013 on tumor growth was detected by xenograft tumor in nude mice. Results ：Microarray analysis predicted a novel circRNA, circ_0001013, was upregulated in GC, which was confirmed by RT-qPCR detection in GC tissues and cells. Besides, miR-136 was downregulated but TWSG1 was highly expressed in GC tissues. Mechanically, circ_0001013 could bind to miR-136, and miR-136 negatively targeted TWSG1 in GC cells. Silencing circ_0001013 or TWSG1 or overexpressing miR-136 decreased GC cell proliferation, migration, invasion, and cell cycle arrest and accelerated cell apoptosis. Circ_0001013 silencing decreased TWSG1 expression and inhibited transplanted tumor growth in nude mice. Conclusion：Circ_0001013 elevated TWSG1 expression by binding to miR-136, thereby exerting oncogenic effect in GC.
3-Bromopyruvate inhibits human gastric cancer tumor growth in nude mice via the inhibition of glycolysis
