A complex phosphodiesterase system controls beta-adrenoceptor signalling in cardiomyocytes.
beta-Adrenergic signalling mediates the positive inotropic effect of catecholamines on cardiomyocytes, mainly through cAMP generation and subsequent activation of PKA (protein kinase A). Given the large diversity of PKA targets within cardiac cells, a precisely regulated and confined activity of such signalling pathways is essential for the specificity of response. PDEs (phosphodiesterases) constitute the only cAMP-degrading mechanism and are expressed in the cardiomyocyte in at least 5 family variants. Each PDE family is characterized by unique functional properties and contributes to a cAMP-degrading system enabling the modulation of PKA activity in a stimulus-dependent fashion.
Mongillo
M
M
Dulbecco Telethon Institute, Venetian Institute of Molecular Medicine, Via Orus 2, 35100 Padova, Italy. marco.mongillo@imperial.ac.uk
Zaccolo
M
M
D000818:Animals; D032383:Myocytes, Cardiac / Q000378:metabolism*; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism*; D011943:Receptors, Adrenergic, beta / Q000378:metabolism*; D015398:Signal Transduction
D011943:Receptors, Adrenergic, beta; D010727:Phosphoric Diester Hydrolases