Targeted inhibition of the expression of both MCM5 and MCM7 by miRNA-214 impedes DNA replication and tumorigenesis in hepatocellular carcinoma cells.

Autor: Wang J; Division of Life Science, Center for Cancer Research and State Key Lab for Molecular Neuroscience, Hong Kong University of Science and Technology, Hong Kong, China., Amin A; Division of Life Science, Center for Cancer Research and State Key Lab for Molecular Neuroscience, Hong Kong University of Science and Technology, Hong Kong, China., Cheung MH; Division of Life Science, Center for Cancer Research and State Key Lab for Molecular Neuroscience, Hong Kong University of Science and Technology, Hong Kong, China., Shi L; Division of Life Science, Center for Cancer Research and State Key Lab for Molecular Neuroscience, Hong Kong University of Science and Technology, Hong Kong, China., Liang C; Division of Life Science, Center for Cancer Research and State Key Lab for Molecular Neuroscience, Hong Kong University of Science and Technology, Hong Kong, China; EnKang Pharmaceuticals (Guangzhou), Ltd., Guangzhou, China. Electronic address: bccliang@ust.hk.
Jazyk: angličtina
Zdroj: Cancer letters [Cancer Lett] 2022 Jul 28; Vol. 539, pp. 215677. Date of Electronic Publication: 2022 Apr 28.
DOI: 10.1016/j.canlet.2022.215677
Abstrakt: MicroRNAs are noncoding RNAs with a typical length of 22 nucleotides that post-transcriptionally suppress gene expression by inducing target mRNA degradation and/or impairing translation in eukaryotes. Thousands of miRNA genes in the human genome are involved in various physiological and pathological processes. Each miRNA targets many different mRNAs, while each mRNA may be targeted by various miRNAs. Mini-chromosome maintenance (MCM2-7) protein complex functions as essential components of the pre-replicative complex (pre-RC) and forms a helicase together with other proteins to unwind the DNA duplex in S phase. MCM proteins are overexpressed in all cancer cells, while they are strictly regulated in normal cells, with no expression in non-proliferating normal cells. Here we report that miRNA-214-3p (miR-214) targets both MCM5 and MCM7. The level of miR-214 is lower in HepG2 and Hep3B hepatocellular carcinoma cells than the L-02 normal liver cells. Introduction of miRNA-214 mimic into HepG2 and Hep3B cells reduced the mRNA and protein levels of MCM5/7 and inhibited DNA replication, cell cycle progression, cell proliferation and colony formation. Comparatively, miRNA-214 mimic had little effect in L-02 cells. Importantly, miR-214 mimic can also inhibit the growth of HepG2 xenografts in nude mice. Our data suggest that miRNA-214 regulates DNA replication by targeting MCM5/7 and has the potential to be developed into a liver cancer drug. IMPLICATIONS: This study supports the notion that DNA replication-initiation proteins (DRIPs), including MCM2-7 proteins, are attractive anticancer targets. Furthermore, the potential of miR-214 as an anticancer agent, with activity against liver cancer cells but not normal livre cells, may be of high significance.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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