Selective repression of MEF2 activity by PKA-dependent proteolysis of HDAC4.
Selective repression of MEF2 activity by PKA-dependent proteolysis of HDAC4.
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DOI:
10.1083/jcb.201105063
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发表时间:
2011-10-31
期刊:
影响因子:
--
通讯作者:
Olson EN
中科院分区:
文献类型:
--
作者:
Backs J;Worst BC;Lehmann LH;Patrick DM;Jebessa Z;Kreusser MM;Sun Q;Chen L;Heft C;Katus HA;Olson EN
PKA and CaM kinase II both target the histone deacetylase HDAC4 such that the former antagonizes MEF2 activity and the latter promotes it. Histone deacetylase 4 (HDAC4) regulates numerous gene expression programs through its signal-dependent repression of myocyte enhancer factor 2 (MEF2) and serum response factor (SRF) transcription factors. In cardiomyocytes, calcium/calmodulin-dependent protein kinase II (CaMKII) signaling promotes hypertrophy and pathological remodeling, at least in part by phosphorylating HDAC4, with consequent stimulation of MEF2 activity. In this paper, we describe a novel mechanism whereby protein kinase A (PKA) overcomes CaMKII-mediated activation of MEF2 by regulated proteolysis of HDAC4. PKA induces the generation of an N-terminal HDAC4 cleavage product (HDAC4-NT). HDAC4-NT selectively inhibits activity of MEF2 but not SRF, thereby antagonizing the prohypertrophic actions of CaMKII signaling without affecting cardiomyocyte survival. Thus, HDAC4 functions as a molecular nexus for the antagonistic actions of the CaMKII and PKA pathways. These findings have implications for understanding the molecular basis of cardioprotection and other cellular processes in which CaMKII and PKA exert opposing effects.
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影响因子:
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作者:
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通讯作者:
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影响因子:
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DOI:
10.1073/pnas.0337639100
发表时间:
2003-02-18
影响因子:
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作者:
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通讯作者:
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5
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