Activation of histone deacetylase-6 induces contractile dysfunction through derailment of α-tubulin proteostasis in experimental and human atrial fibrillation

Deli Zhang, Chia Tung Wu, Xiao Yan Qi, Roelien A.M. Meijering, Femke Hoogstra-Berends, Artavazd Tadevosyan, Gunseli Cubukcuoglu Deniz, Serkan Durdu, Ahmet Ruchan Akar, Ody C.M. Sibon, Stanley Nattel, Robert H. Henning, Bianca J.J.M. Brundel*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

77 Citations (Scopus)

Abstract

Background-Atrial fibrillation (AF) is characterized by structural remodeling, contractile dysfunction, and AF progression. Histone deacetylases (HDACs) influence acetylation of both histones and cytosolic proteins, thereby mediating epigenetic regulation and influencing cell proteostasis. Because the exact function of HDACs in AF is unknown, we investigated their role in experimental and clinical AF models. Methods and Results-Tachypacing of HL-1 atrial cardiomyocytes and Drosophila pupae hearts significantly impaired contractile function (amplitude of Ca2+ transients and heart wall contractions). This dysfunction was prevented by inhibition of HDAC6 (tubacin) and sirtuins (nicotinamide). Tachypacing induced specific activation of HDAC6, resulting in α-tubulin deacetylation, depolymerization, and degradation by calpain. Tachypacing-induced contractile dysfunction was completely rescued by dominant-negative HDAC6 mutants with loss of deacetylase activity in the second catalytic domain, which bears α-tubulin deacetylase activity. Furthermore, in vivo treatment with the HDAC6 inhibitor tubastatin A protected atrial tachypaced dogs from electric remodeling (action potential duration shortening, L-type Ca2+ current reduction, AF promotion) and cellular Ca 2+-handling/contractile dysfunction (loss of Ca2+ transient amplitude, sarcomere contractility). Finally, atrial tissue from patients with AF also showed a significant increase in HDAC6 activity and reduction in the expression of both acetylated and total α-tubulin. Conclusions-AF induces remodeling and loss of contractile function, at least in part through HDAC6 activation and subsequent derailment of α-tubulin proteostasis and disruption of the cardiomyocyte microtubule structure. In vivo inhibition of HDAC6 protects against AF-related atrial remodeling, disclosing the potential of HDAC6 as a therapeutic target in clinical AF

Original languageEnglish
Pages (from-to)346-358
Number of pages13
JournalCirculation
Volume129
Issue number3
DOIs
Publication statusPublished - 21 Jan 2014
Externally publishedYes

Keywords

  • Alpha-tubulin deacetylase
  • Atrial fibrillation
  • Drosophila
  • Epigenesis
  • Genetic
  • HDAC6 protein
  • Human

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