Involvement of miR-619-5p in resistance to cisplatin by regulating ATXN3 in oral squamous cell carcinoma.

Abstract

MicroRNAs are major post-transcriptional regulators responsible for the development of human cancers, including OSCC. The specific role of miR-619-5p in OSCC, however, is rarely reported. Cisplatin is one of the mostly applied chemotherapy drugs of OSCC. Nevertheless, drug resistance of cisplatin following the initial chemotherapy largely restricts its clinical benefits, and the mechanism of cisplatin resistance is unclear. This study intends to explore the biological function of miR-619-5p in the development of cisplatin resistance in OSCC cell lines and a xenograft model, as well as the potential molecular mechanism. Our results showed that miR-619-5p was down-regulated in OSCC samples and cisplatin-resistant OSCC cells. Ectopically expressed miR-619-5p inhibited proliferative, migratory and invasive abilities of OSCC cisplatin-resistant cells. The putative target gene ATXN3 was predicted by bioinformatic analysis and confirmed by dual-luciferase reporter assay. Importantly, ATXN3 was responsible for the regulatory effects of miR-619-5p on biological behaviors of cisplatin-resistant OSCC cells. Moreover, miR-619-5p mimics and ATXN3-siRNA significantly enhanced ATXN3 knockdown in both HN6/CDDPR and CAL27/CDDPR cells and inhibited expression of PI3K and AKT. In vivo evidences demonstrated that intratumoral injection of miR-619-5p agomir remarkably slowed down the growth of OSCC in xenograft mice. Collectively, microRNA-619-5p was the vital regulator for regulating cisplatin resistance of OSCC, which may be served as a potential therapeutic target.

• Authors: An Song, Yuanyuan Wu, Weiming Chu, Xueming Yang, Zaiou Zhu, Enshi Yan, Wei Zhang, Junbo Zhou, Xu Ding, Jie Liu, Hongxia Zhu, Jinhai Ye, Yunong Wu, Yang Zheng, Xiaomeng Song
• Journal: International journal of biological sciences (Int J Biol Sci) Vol. 17 Issue 2 Pg. 430-447 ( 2021) ISSN: 1449-2288 [Electronic] Australia
• PMID: 33613103 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © The author(s).

Chemical References

• Antineoplastic Agents
• MIRN-619 microRNA, human
• MicroRNAs
• Repressor Proteins
• ATXN3 protein, human
• Ataxin-3
• Cisplatin

Topics

• Adult
• Aged
• Antineoplastic Agents (pharmacology)
• Ataxin-3 (metabolism)
• Cell Line
• Cisplatin (therapeutic use)
• Female
• Humans
• Male
• MicroRNAs (physiology)
• Middle Aged
• Mouth Neoplasms (drug therapy, pathology)
• Repressor Proteins (metabolism)
• Squamous Cell Carcinoma of Head and Neck (drug therapy, pathology)