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Attenuation of cAMP accumulation in adult rat cardiac fibroblasts by IL-1beta and NO: role of cGMP-stimulated PDE2.

Authors: Gustafsson, AB  Brunton, LL 
Citation: Gustafsson AB and Brunton LL, Am J Physiol Cell Physiol 2002 Aug;283(2):C463-71.
Pubmed: (View Article at PubMed) PMID:12107056
DOI: Full-text: DOI:10.1152/ajpcell.00299.2001

Treatment of cultured adult rat cardiac fibroblasts with interleukin-1beta (IL-1beta) induces the inducible nitric oxide synthase (iNOS) expression, increases nitric oxide (NO) and cGMP production, and attenuates cAMP accumulation in response to isoproterenol by ~50%. Reduced cAMP accumulation is due to NO production: the effect is mimicked by NO donors and prevented by N(G)-monomethyl-L-arginine, an NOS inhibitor. Effects of NO are not restricted to the beta-adrenergic response; the response to forskolin is similarly diminished. NO donors only slightly (12%) decrease forskolin-stimulated adenylyl cyclase (AC) activity in cardiac fibroblast plasma membranes, suggesting that the main effect of NO is not a direct one on AC. An inhibitor of soluble guanylyl cyclase inhibits the effects of IL-1beta and NO donors; inhibition of cGMP-dependent protein kinase is without effect. 3-Isobutyl-1-methylxanthine, a nonspecific phosphodiesterase (PDE) inhibitor, and erythro-9-(2-hydroxy-3-nonyl)adenine, a specific inhibitor of the cGMP-stimulated PDE (PDE2), completely restore cAMP accumulation in sodium nitroprusside-treated fibroblasts and largely reverse the attenuated response in IL-1beta-treated fibroblasts. Although NO reportedly acts by reducing AC activity in some cells, in cardiac fibroblasts NO production decreases cAMP accumulation largely by the cGMP-mediated activation of PDE2.

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CRRD Object Information
CRRD ID: 625635
Created: 2002-10-16
Species: All species
Last Modified: 2002-10-16
Status: ACTIVE



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