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Submitted on February 13, 2004
Revised on May 24, 2004
Accepted on May 25, 2004
From the Dulbecco Telethon Institute (M.M., V.L., A.T., T.P., M.Z.), Venetian Institute of Molecular Medicine (M.M., S.E., V.L., T.P., M.Z.), Padova, Italy; Department of Biomedical Sciences (M.M., V.L.), University of Padova, Padova, Italy; Division of Biochemistry and Molecular Biology (T.M., A.S., E.H., M.D.H.), IBLS, Wolfson Building, University of Glasgow, Glasgow, Scotland; Institute of Pharmacology and Toxicology (A.H., M.J.L.), University of Würzburg, Würzburg, Germany.
* To whom correspondence should be addressed. E-mail: manuela.zaccolo{at}unipd.it.
Cardiac myocytes have provided a key paradigm for the concept of the compartmentalized cAMP generation sensed by AKAP-anchored PKA. Phosphodiesterases (PDEs) provide the sole route for degrading cAMP in cells and are thus poised to regulate intracellular cAMP gradients. PDE3 and PDE4 represent the major cAMP degrading activities in rat ventriculocytes. By performing real-time imaging of cAMP in situ, we establish the hierarchy of these PDEs in controlling cAMP levels in basal conditions and on stimulation with a
-adrenergic receptor agonist. PDE4, rather than PDE3, appears to be responsible for modulating the amplitude and duration of the cAMP response to beta-agonists. PDE3 and PDE4 localize to distinct compartments and this may underpin their different functional roles. Our findings indicate the importance of distinctly localized PDE isoenzymes in determining compartmentalized cAMP signaling.
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