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Circ_0046599 Promotes the Development of Hepatocellular Carcinoma by Regulating the miR-1258/RPN2 Network

Authors Fang Q, Liu H, Zhou A, Zhou H, Zhang Z

Received 11 March 2020

Accepted for publication 10 July 2020

Published 4 August 2020 Volume 2020:12 Pages 6849—6860


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Professor Harikrishna Nakshatri

Quangang Fang, Haiyun Liu, Aiqun Zhou, Huaping Zhou, Zhiyong Zhang

Department of Laboratory, Jiangxi Provincial People’s Hospital Affiliated to Nanchang University, Nanchang 330006, Jiangxi, People’s Republic of China

Correspondence: Zhiyong Zhang
Department of Laboratory, Jiangxi Provincial People’s Hospital Affiliated to Nanchang University, No. 92 Aiguo Road, Nanchang 330006, Jiangxi, People’s Republic of China
Tel +86-791-86895951

Background: Many studies have confirmed that circular RNAs (circRNAs) play a key role in the biological progression of cancers. However, the function of a novel circRNA, circ_0046599, in hepatocellular carcinoma (HCC) progression has not been explored.
Methods: Quantitative real-time polymerase chain reaction (qRT-PCR) was performed to measure the expression of circ_0046599, microRNA (miR)-1258 and Ribophorin II (RPN2). Subcellular fractionation location assay was used to localize circ_0046599 in HCC cells. The circular characteristic of circ_0046599 was verified using Ribonuclease R (RNase R) digestion assay. Besides, cell counting kit 8 (CCK8) assay, colony formation assay, wound healing assay and transwell assay were used to detect cell proliferation, migration and invasion, respectively. The lactate production and glucose level were determined by Lactate and Glucose Assay Kits. Furthermore, the protein levels of glycolysis, metastasis and proliferation-related marker proteins, as well as RPN2 were tested by Western blot (WB) analysis. Moreover, dual-luciferase reporter assay and RNA immunoprecipitation (RIP) assay were employed to confirm the interactions among circ_0046599, miR-1258 and RPN2. In addition, mice xenograft models were applied to observe the effect of circ_0046599 silencing on HCC tumor growth in vivo.
Results: Circ_0046599 was highly expressed in HCC tissues and cells, and its knockdown could suppress HCC cell proliferation, migration, invasion and glycolysis process. MiR-1258 could be targeted by circ_0046599, and its inhibitor could invert the suppressing effect of circ_0046599 knockdown on HCC progression. Further, RPN2 was a target of miR-1258. Overexpressed RPN2 could reverse the inhibiting effect of miR-1258 overexpression on HCC progression. Also, knockdown of circ_0046599 could restrain HCC tumor growth in vivo.
Conclusion: Our results provided new evidence that circ_0046599 could promote the progression of HCC by increasing RPN2 expression via sponging miR-1258.

Keywords: HCC, circ_0046599, miR-1258, RPN2, progression

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