Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 288, Issue 1, Pages 192-204Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M112.382358
Keywords
-
Categories
Funding
- National Institutes of Health [P01-HL80101, R01HL103933]
- American Heart Association [0835312N, 09PRE2260256]
Ask authors/readers for more resources
During hemodynamic stress, catecholamines and neurohumoral stimuli may induce co-activation of G(q)-coupled receptors and beta-adrenergic receptors (beta-AR), leading to cardiac remodeling. Dynamic regulation of histone deacetylase 5 (HDAC5), a transcriptional repressor, is crucial during stress signaling due to its role in epigenetic control of fetal gene markers. Little is known about its regulation during acute and chronic beta-AR stimulation and its cross-interaction with G(q) signaling in adult cardiac myocytes. Here, we evaluate the potential cross-talk between G(q)-driven and beta-AR mediated signaling at the level of nucleocytoplasmic shuttling of HDAC5. We show the translocation of GFP-tagged wild type HDAC5 or mutants (S279A and S279D) in response to beta-AR or G(q) agonists. Isoproterenol (ISO) or PKA activation results in strong nuclear accumulation of HDAC5 in contrast to nuclear export driven by Ca2+-calmodulin protein kinase II and protein kinase D. Moreover, nuclear accumulation of HDAC5 under acute ISO/PKA signaling is dependent on phosphorylation of Ser-279 and can block subsequent G(q)-mediated nuclear HDAC5 export. Intriguingly, the attenuation of G(q)-induced export is abolished after chronic PKA activation, yet nuclear HDAC5 remains elevated. Last, the effect of chronic beta-AR signaling on HDAC5 translocation was examined in adult myocytes from a rabbit model of heart failure, where ISO-induced nuclear import is ablated, but G(q)-agonist mediated export is preserved. Acute beta-AR/PKA activation protects against hypertrophic signaling by delaying G(q)-mediated transcriptional activation. This serves as a key physiological control switch before allowing genetic reprogramming via HDAC5 nuclear export during more severe stress, such as heart failure.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available