Circular RNA NOX4 promotes the development of colorectal cancer via the microRNA‑485‑5p/CKS1B axis.

Abstract:

:Colorectal cancer (CRC) is a common malignancy globally. The aim of the present study was to explore the role and the working mechanism of circular RNA NADPH oxidase 4 (circNOX4; circBase ID, hsa_circ_0023990) in CRC. Reverse transcription‑quantitative (RT‑q)PCR was used to examine the expression of circNOX4, NOX4 mRNA and microRNA (miR)‑485‑5p in CRC tissues and cell lines. 3‑(4,5‑Dimethylthiazol‑2‑yl)‑2,5‑diphenyltetrazolium bromide and Transwell assays were performed to analyze CRC cell viability and motility. The glycolytic ability of CRC cells was assessed by measuring glucose consumption, lactate production, extracellular acidification and O2 consumption rates using commercial kits. The starBase database was used to predict the targets of circNOX4 and miR‑485‑5p, and the interaction was confirmed by dual‑luciferase reporter and RNA immunoprecipitation assays. A murine xenograft model was established to verify the role of circNOX4 in CRC in vivo. The results demonstrated that the expression of circNOX4 was upregulated in CRC tissues and cell lines compared with that in adjacent normal tissues and a normal colon epithelial cell line, respectively. The expression of circNOX4 was negatively associated with the prognosis of patients with CRC. CircNOX4 silencing suppressed the proliferation, migration, invasion and glycolysis of CRC cells. miR‑485‑5p was identified as a target of circNOX4. CircNOX4 promoted CRC progression by sponging miR‑485‑5p. miR‑485‑5p was demonstrated to bind to the 3' untranslated region (UTR) of CDC28 protein kinase regulatory subunit 1B (CKS1B). miR‑485‑5p overexpression‑mediated malignant properties of CRC cells were partly reversed by the transfection with the CKS1B overexpression plasmid. CircNOX4 silencing restrained the CRC xenograft growth in vivo. Collectively, the results of the present study demonstrated that circNOX4 may serve an oncogenic role in CRC by promoting the proliferation, migration, invasion and glycolysis of CRC cells via the miR‑485‑5p/CKS1B axis.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Wang X,Tao G,Huang D,Liang S,Zheng D

doi

10.3892/or.2020.7758

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

2009-2020

issue

5

eissn

1021-335X

issn

1791-2431

journal_volume

44

pub_type

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