Artificial Cells, Nanomedicine, and Biotechnology (Dec 2019)

Circ_0026344 restrains metastasis of human colorectal cancer cells via miR-183

  • Tao Shen,
  • Xianshuo Cheng,
  • Xin Liu,
  • Cuifeng Xia,
  • Hongtao Zhang,
  • Dingguo Pan,
  • Xuan Zhang,
  • Yunfeng Li

DOI
https://doi.org/10.1080/21691401.2019.1669620
Journal volume & issue
Vol. 47, no. 1
pp. 4038 – 4045

Abstract

Read online

Background CircRNA circ_0026344 was previously revealed as a tumour-suppressive gene in colorectal cancer (CRC) progression. The purpose of this research was to investigate the role of circ_0026344 in CRC cells metastasis induced by chemokines.Methods Two human CRC cell lines SW480 and Caco-2 were treated by CCL20 and CXCL8. Cell proliferation, migration/invasion, expression of epithelial-mesenchymal transition (EMT) inducers and the expression of circ_0026344 were measured using sulforhodamine B assay, Transwell chamber, western blot and qRT-PCR, respectively. The effects of circ_0026344 on CRC cells migration/invasion and the expression of EMT inducers were evaluated. Moreover, the downstream miRNA and signalling pathways of circ_0026344 were studied.Results CCL20 and CXCL8 synergized to facilitate the proliferation, migration and invasion of CRC cells. At the meantime, E-cadherin was downregulated, whereas N-cadherin, Vimentin and Snail were up-regulated by CCL20 and CXCL8 co-stimulation, which was accompanied by the mobilization of PI3K/AKT/ERK signalling. More interestingly, the expression of circ_0026344 was down-regulated by CCL20 and CXCL8 co-stimulation. Silence of circ_0026344 increased the migratory and invasive capacities of CRC cells and increased EMT process as well. Overexpression of circ_0026344 led to a contrary impact. miR-183 was negatively regulated by circ_0026344, and the inhibitory effects of circ_0026344 overexpression on Wnt/β-catenin pathway were reversed when miR-183 was overexpressed.Conclusion Overexpression of circ_0026344 restrained CRC metastasis and EMT induced by CCL20 and CXCL8 synergistical treatment. miR-183 was a downstream effector of circ_0026344, and the anti-tumour function of circ_0026344 might be involved in the repressed Wnt/β-catenin signalling.HighlightsCCL20 and CXCL8 synergize to decrease the expression of circ_0026344;Silence of circ_0026344 promotes CRC cells migration, invasion and EMT process;miR-183 is a downstream effector of circ_0026344.

Keywords