期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 283, 期 25, 页码 17009-17019出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M709851200
关键词
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资金
- NHLBI NIH HHS [HL-67101, HL77860, R01 HL077860, HL-28958] Funding Source: Medline
- NIAID NIH HHS [R29 AI038396] Funding Source: Medline
Many growth regulatory stimuli promote cAMP response element-binding protein (CREB) Ser(133) phosphorylation, but the physiologically relevant CREB-Ser(133) kinase(s) in the heart remains uncertain. This study identifies a novel role for protein kinase D (PKD) as an in vivo cardiac CREB-Ser(133) kinase. We show that thrombin activates a PKC delta-PKD pathway leading to CREB-Ser(133) phosphorylation in cardiomyocytes and cardiac fibroblasts. alpha(1)-Adrenergic receptors also activate a PKC delta-PKD-CREB-Ser(133) phosphorylation pathway in cardiomyocytes. Of note, while the epidermal growth factor (EGF) promotes CREB-Ser(133) phosphorylation via an ERK-RSK pathway in cardiac fibroblasts, the thrombin-dependent EGFR transactivation pathway leading to ERK-RSK activation does not lead to CREB-Ser(133) phosphorylation in this cell type. Adenoviral-mediated overexpression of PKC delta(but not PKC epsilon or PKC alpha) activates PKD; PKC delta and PKD1-S744E/S748E overexpression both promote CREB-Ser(133) phosphorylation. Pasteuralla multocida toxin (PMT), a direct G alpha(q) agonist that induces robust cardiomyocyte hypertrophy, also activates the PKD-CREB-Ser(133) phosphorylation pathway, leading to the accumulation of active PKD and Ser(133)-phosphorylated CREB in the nucleus, activation of a CRE-responsive promoter, and increased Bcl-2 (CREB target gene) expression in cardiomyocyte cultures. Cardiac-specific G alpha(q) overexpression also leads to an increase in PKD-Ser(744)/Ser(748) and CREB-Ser(133) phosphorylation as well as increased Bcl-2 protein expression in the hearts of transgenic mice. Collectively, these studies identify a novel G alpha(q)-PKC delta-PKD-CREB-Ser(133) phosphorylation pathway that is predicted to contribute to cardiac remodeling and could be targeted for therapeutic advantage in the setting of heart failure phenotypes.
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