期刊
ONCOLOGY LETTERS
卷 21, 期 1, 页码 -出版社
SPANDIDOS PUBL LTD
DOI: 10.3892/ol.2020.12315
关键词
HDAC6; small molecule inhibitor; bladder cancer; apoptosis; cell cycle
类别
资金
- Niigata University [CH28015, CH29018]
This study investigated the role of HDAC6 in urothelial cancer and found that inhibition of HDAC6 decreased cell viability and was associated with PD-L1 expression, suggesting it could be a promising novel approach for the treatment of urothelial cancer.
Histone deacetylases (HDACs) are enzymes that remove acetyl groups from histones and have attracted attention as potential targets for cancer therapy. Several small molecule inhibitors have been developed to target HDACs; however, clinical trials of pan-HDAC inhibitors have found these types of inhibitors to be inefficient and to be relatively highly toxic. In the present study, the role of one HDAC isozyme, HDAC6, in urothelial cancer was investigated. Protein expression levels and subcellular localization of HDAC6 was identified in surgically resected bladder tumors using immunohistochemistry. The antitumor effects of 12 small molecule HDAC6 inhibitors were also examined in vitro using cultured urothelial cancer cells. The HDAC6 inhibitors decreased cell viability, with IC50 values in the low mu M range, as low as 2.20 mu M. HDACi D, E and F had the lowest IC50 values. HDAC6 has been previously reported to regulate programmed death-ligand 1 (PD-L1) and PD-L1 expression was found to be a predictor of decreased overall survival time. There was no association between the protein expression level of HDAC6 and PD-L1 in tumor tissues; however, HDAC6 inhibition by specific small molecule inhibitors resulted in decreased expression levels of membranous PD-L1 in cultured urothelial cancer cell lines. The results suggested that inhibition of HDAC6 could be a promising novel approach for the treatment of urothelial cancer.
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