HDAC Inhibitors and Chaperone Function

Rekha Rao, Warren Fiskus, Siddhartha Ganguly, Suman Kambhampati, Kapil N. Bhalla

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Cellular chaperones promote the folding and maturation of newly synthesized proteins and partially folded proteins in the cytosol and endoplasmic reticulum (ER) as well as prevent the aggregation of misfolded proteins. Histone deacetylases (HDACs) and histone acetyl transferases catalyze the reversible acetylation of histones and nonhistone substrates to control the epigenetic and transcriptomic landscape of normal and tumor cells. Treatment with HDAC inhibitors results in the hyperacetylation of chaperones including heat shock protein (hsp)90, hsp70, hsp40, and the ER-resident hsp70 homolog, glucose-regulated protein 78 (GRP78), which affects their function. HDAC inhibitor-mediated deregulation of chaperone function, in turn, deregulates protein homeostasis and induces protein misfolding and proteotoxic stress. In the context of tumors which are particularly dependent on functional chaperones for maintaining protein homeostasis, HDAC inhibitors tip the balance toward lethal proteotoxic and ER stress. In this chapter, we describe HDAC inhibitor-induced hyperacetylation of major chaperones and its implication for the use of HDAC inhibitors in the treatment of solid and hematologic tumors.

Original languageEnglish
Pages (from-to)239-262
Number of pages24
JournalAdvances in Cancer Research
Volume116
DOIs
StatePublished - Oct 29 2012
Externally publishedYes

Keywords

  • Acetylation
  • Autophagy
  • Chaperones
  • ER stress
  • GRP78
  • Histone deacetylases
  • Hsp70
  • Hsp90
  • Proteotoxic stress

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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