期刊
JOURNAL OF BIOMEDICAL SCIENCE
卷 28, 期 1, 页码 -出版社
BMC
DOI: 10.1186/s12929-021-00752-4
关键词
Hepatocellular carcinoma; Sorafenib; MiR-138-1-3p; p21-Activated kinases 5; Wnt; beta-catenin pathway; ABCB1
资金
- National Natural Science Foundation of China [81572349, 81872080]
- Jiangsu Provincial Medical Talent [ZDRCA2016055]
- Science and Technology Department of Jiangsu Province [BK20181148]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 333 high-level talents of Jiangsu Province [BRA2019083]
Our study revealed that the downregulation of miR-138-1-3p and upregulation of PAK5 were associated with sorafenib resistance in HCC cells. Mechanistic studies showed that miR-138-1-3p targeted PAK5 mRNA to reduce PAK5 protein expression. Additionally, PAK5 promoted the activation of a multidrug resistance protein ABCB1 via the beta-catenin signaling pathway, contributing to sorafenib resistance in HCC.
BackgroundSorafenib is a kinase inhibitor that is used as a first-line therapy in advanced hepatocellular carcinoma (HCC) patients. However, the existence of sorafenib resistance has limited its therapeutic effect. Through RNA sequencing, we demonstrated that miR-138-1-3p was downregulated in sorafenib resistant HCC cell lines. This study aimed to investigate the role of miR-138-1-3p in sorafenib resistance of HCC.MethodsIn this study, quantitative real-time PCR (qPCR) and Western Blot were utilized to detect the levels of PAK5 in sorafenib-resistant HCC cells and parental cells. The biological functions of miR-138-1-3p and PAK5 in sorafenib-resistant cells and their parental cells were explored by cell viability assays and flow cytometric analyses. The mechanisms for the involvement of PAK5 were examined via co-immunoprecipitation (co-IP), immunofluorescence, dual luciferase reporter assay and chromatin immunoprecipitation (ChIP). The effects of miR-138-1-3p and PAK5 on HCC sorafenib resistant characteristics were investigated by a xenotransplantation model.ResultsWe detected significant down-regulation of miR-138-1-3p and up-regulation of PAK5 in sorafenib-resistance HCC cell lines. Mechanistic studies revealed that miR-138-1-3p reduced the protein expression of PAK5 by directly targeting the 3-UTR of PAK5 mRNA. In addition, we verified that PAK5 enhanced the phosphorylation and nuclear translocation of beta -catenin that increased the transcriptional activity of a multidrug resistance protein ABCB1.Conclusions PAK5 contributed to the sorafenib resistant characteristics of HCC via beta -catenin/ABCB1 signaling pathway. Our findings identified the correlation between miR-138-1-3p and PAK5 and the molecular mechanisms of PAK5-mediated sorafenib resistance in HCC, which provided a potential therapeutic target in advanced HCC patients.
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