Calmodulin kinase II inhibition protects against structural heart disease.

Zhang R, Khoo MS, Wu Y, Yang Y, Grueter CE, Ni G, Price EE, Thiel W, Guatimosim S, Song LS, Madu EC, Shah AN, Vishnivetskaya TA, Atkinson JB, Gurevich VV, Salama G, Lederer WJ, Colbran RJ, Anderson ME
Nat Med. 2005 11 (4): 409-17

PMID: 15793582 · DOI:10.1038/nm1215

Beta-adrenergic receptor (betaAR) stimulation increases cytosolic Ca(2+) to physiologically augment cardiac contraction, whereas excessive betaAR activation causes adverse cardiac remodeling, including myocardial hypertrophy, dilation and dysfunction, in individuals with myocardial infarction. The Ca(2+)-calmodulin-dependent protein kinase II (CaMKII) is a recently identified downstream element of the betaAR-initiated signaling cascade that is linked to pathological myocardial remodeling and to regulation of key proteins involved in cardiac excitation-contraction coupling. We developed a genetic mouse model of cardiac CaMKII inhibition to test the role of CaMKII in betaAR signaling in vivo. Here we show CaMKII inhibition substantially prevented maladaptive remodeling from excessive betaAR stimulation and myocardial infarction, and induced balanced changes in excitation-contraction coupling that preserved baseline and betaAR-stimulated physiological increases in cardiac function. These findings mark CaMKII as a determinant of clinically important heart disease phenotypes, and suggest CaMKII inhibition can be a highly selective approach for targeting adverse myocardial remodeling linked to betaAR signaling.

MeSH Terms (14)

Adrenergic beta-Antagonists Animals Arrhythmias, Cardiac Calcium Calcium-Calmodulin-Dependent Protein Kinases Calcium-Calmodulin-Dependent Protein Kinase Type 2 Cardiac Output, Low Cardiomegaly Mice Mice, Transgenic Myocardial Contraction Myocardial Infarction Phosphorylation Ventricular Remodeling

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