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(Circulation Research. 2004;94:936.)
© 2004 American Heart Association, Inc.

Cellular Biology

High and Low Gain Switches for Regulation of cAMP Efflux Concentration

Distinct Roles for Particulate GC- and Soluble GC-cGMP-PDE3 Signaling in Rabbit Atria

Jin Fu Wen, Xun Cui, Jing Yu Jin, Soo Mi Kim, Sung Zoo Kim, Suhn Hee Kim, Ho Sub Lee, Kyung Woo Cho

From the Department of Physiology, Institute for Medical Sciences, Jeonbug National University Medical School (J.F.W., X.C., J.Y.J., S.M.K., S.Z.K., S.H.K., K.W.C), Jeonju; Department of Herbal Resources, Wonkwang University Professional Graduate School of Oriental Medicine (H.S.L.), Iksan, Korea.

Correspondence to Kyung Woo Cho, MD, PhD, Department of Physiology, Jeonbug National University, Medical School, 2-20, Keum-Am-Dong-San, Jeonju 561-180, Republic of Korea. E-mail kwcho{at}moak.chonbuk.ac.kr

This study tests the hypothesis that particulate (p) guanylyl cyclase (GC) and soluble (s) GC are involved in the distinct roles for the regulation of cGMP-PDE-cAMP signaling and of mechanical and secretory functions in the heart. Experiments were performed in perfused beating rabbit atria. C-type natriuretic peptide (CNP) and SIN-1, an NO donor, or BAY 41-2272 (BAY), a direct activator for sGC, were used to activate pGC and sGC, respectively. CNP and SIN-1 increased cGMP and cAMP efflux in a concentration-dependent manner. Increase in cAMP was a function of cGMP. The changes in cAMP efflux concentration in terms of cGMP were much more prominent in the atria treated with CNP than in the atria treated with SIN-1. Increase in cAMP efflux concentration was blocked by milrinone but not changed by EHNA. BAY increased cGMP but not cAMP in a concentration-dependent manner. CNP and SIN-1 decreased atrial stroke volume and myocytic ANP release. The decreases in terms of cGMP efflux concentration were much more prominent in the atria treated with CNP than in the atria treated with SIN-1 or BAY. Milrinone accentuated GC agonist–induced decreases in atrial stroke volume and ANP release. In the presence of ODQ, SIN-1 or BAY induced effects were not observed. These data suggest that pGC and sGC activations have distinct roles via cGMP-PDE3-cAMP signaling in the cardiac atrium: high and low gain switches, respectively, for the regulation of cAMP levels and contractile and secretory functions.

Key Words: cGMP • cAMP • guanylyl cyclase • phosphodiesterase 3 • atrial natriuretic peptide

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