cAMP signaling increases histone deacetylase 8 expression by inhibiting JNK-dependent degradation via autophagy and the proteasome system in H1299 lung cancer cells

Biochemical and Biophysical Research Communications
Ji-Yeon Park, Yong-Sung Juhnn

Abstract

This study aimed to investigate the roles of autophagy and the ubiquitin-proteasome system in the degradation of histone deacetylase 8 (HDAC8) and to clarify the mechanism by which cAMP signaling regulates this degradation. cAMP signaling was activated by treating H1299 non-small cell lung cancer cells with isoproterenol or forskolin/3-isobutyl-1-methylxanthine, and HDAC8 expression was assessed by western blot analysis. The inhibition of autophagy and ubiquitin-proteasome-dependent degradation increased HDAC8 expression. cAMP signaling inhibited JNK activation, which decreased the phosphorylation of Bcl-2, thereby reducing autophagy, and the phosphorylation of Itch, thereby reducing ubiquitination. These results suggest that the HDAC8 protein is degraded via autophagy and the ubiquitin-proteasome system and that cAMP signaling increases HDAC8 protein levels by reducing JNK-mediated autophagy and ubiquitin-proteasome-dependent degradation of the HDAC8 protein in H1299 lung cancer cells.

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Citations

Oct 16, 2016·Journal of Cellular Physiology·Luigi SapioSilvio Naviglio
Feb 25, 2017·Experimental & Molecular Medicine·Ji-Yeon Park, Yong-Sung Juhnn
Aug 15, 2019·Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas·Wei-Jia ZhangYa-Li Wu
Dec 23, 2016·Oncology Reports·Mee-Young Ahn, Jung-Hoon Yoon
Jun 5, 2018·Annals of Gastroenterological Surgery·Toshiaki YoshimotoMitsuo Shimada

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