Inhibition of Class I Histone Deacetylases 1 and 2 Promotes Urothelial Carcinoma Cell Death by Various Mechanisms

Molecular Cancer Therapeutics
Maria PinkerneilGuenter Niegisch

Abstract

Class I histone deacetylases HDAC1 and HDAC2 contribute to cell proliferation and are commonly upregulated in urothelial carcinoma. To evaluate whether specific inhibition of these enzymes might serve as an appropriate therapy for urothelial carcinoma, siRNA-mediated knockdown and specific pharmacologic inhibition of HDAC1 and HDAC2 were applied in urothelial carcinoma cell lines (UCC) with distinct HDAC1 and HDAC2 expression profiles. HDACs and response marker proteins were followed by Western blotting and qRT-PCR. Effects of class I HDAC suppression on UCCs were analyzed by viability, colony forming, and caspase-3/7 assays; flow cytometry, senescence and lactate dehydrogenase cytotoxicity assays; and immunofluorescence staining. Whereas single knockdowns of HDAC1 or HDAC2 were impeded by compensatory upregulation of the other isoenzyme, efficient double knockdown of HDAC1 and HDAC2 reduced proliferation by up to 80% and induced apoptosis-like cell death in all UCCs. Clonogenic growth was cell line- and HDAC-dependently reduced, with double knockdown of HDAC1 and HDAC2 being usually most efficient. Class I HDAC-specific inhibitors, especially the more specific HDAC1/2 inhibitors romidepsin and givinostat, significantly reduced...Continue Reading

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