Journal
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
Volume 287, Issue 5, Pages H1906-H1912Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpheart.00356.2004
Keywords
cAMP; beta-adrenergic receptor; myocardium; heart failure
Funding
- NHLBI NIH HHS [1P01-HL-669411] Funding Source: Medline
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Calcium malfunction plays a central role in heart failure. Here, we provide evidence that adenylyl cyclase type VI restores sarco(endo)plasmic reticulum 2a (SERCA2a) affinity for calcium and maximum velocity of cardiac calcium uptake by sarcoplasmic reticulum in murine dilated cardiomyopathy. Restoration of normal SERCA2a affinity for calcium is associated not only with decreased phospholamban protein expression but also with increased phospholamban phosphorylation by PKA activation. The ratio of phosphorylated ryanodine receptor 2 (RyR2) to RyR2 protein was increased, but the amount of phosphorylated RyR2 was unaffected. These data provide a possible mechanism by which adenylyl cyclase type VI ( in contrast to other signaling elements associated with increased cAMP generation) has a salutary effect in the failing heart.
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