Journal
CURRENT OPINION IN PHARMACOLOGY
Volume 11, Issue 6, Pages 707-713Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.coph.2011.09.001
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Funding
- United States Department of Veterans Affairs
- Leducq Foundation [06CVD02 cycAMP]
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In dilated cardiomyopathy, a condition characterized by chamber enlargement and reduced myocardial contractility, decreases in beta-adrenergic receptor density and increases in G alpha i and beta-adrenergic receptor kinase activities attenuate the stimulation of adenylyl cyclase in response to catecholamines. PDE3 inhibitors have been used to 'overcome' the reduction in cAMP generation by blocking cAMP hydrolysis. These drugs increase contractility in the short-term, but long-term administration leads to an increase in mortality that correlates with an increase in sudden cardiac death. Whether separate mechanisms account for these beneficial and harmful effects, and, if so, whether PDE3 can be targeted so as to increase contractility without increasing mortality are questions that remain unanswered.
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