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J Biol Chem, Vol. 273, Issue 22, 13444-13451, May 29, 1998

Autocrine Regulation of Inducible Nitric-oxide Synthase in Macrophages by Atrial Natriuretic Peptide

Alexandra K. Kiemer and Angelika M. Vollmar

From the Institute of Pharmacology, Toxicology and Pharmacy, University of Munich, Königinstrasse 16, 80539 Munich, Germany

Atrial natriuretic peptide (ANP), a cardiovascular hormone, has been shown to inhibit synthesis of nitric oxide in lipopolysaccharide (LPS)-activated mouse bone marrow-derived macrophages via activation of its guanylate cyclase-coupled receptor. The goal of the present study was to elucidate the potential sites of inducible nitric-oxide synthase (iNOS) regulation affected by ANP and revealed the following. 1) ANP and dibutyryl-cGMP did not inhibit catalytic iNOS activity measured by the conversion rate of L-[3H]arginine to L-[3H]citrulline in homogenates of LPS-treated cells. 2) Pretreatment of cells with ANP dose-dependently reduced the LPS-induced L-[3H]citrulline production that has been shown to be due to reduced iNOS protein levels detected by Western blot. 3) ANP does not alter the ratio of catalytically active iNOS dimer versus inactive iNOS monomer considered to be a major post-translational regulatory mechanism for the enzyme. 4) Macrophages exposed to ANP display decreased LPS-induced iNOS mRNA levels. 5) Importantly, two basic mechanisms seem to be responsible for this observation, i.e. ANP specifically induced acceleration of iNOS mRNA decay and ANP reduced binding activity of NF-kappa B, the transcription factor predominantly responsible for LPS-induced iNOS expression in murine macrophages. Moreover, 6) ANP acts via an autocrine mechanism since recently ANP was shown to be secreted by LPS-activated macrophages, and we demonstrated here that LPS-induced NO synthesis was increased after blocking the binding of endogenous ANP by a receptor antagonist. These observations suggest ANP as a new autocrine macrophage factor regulating NO synthesis both transcriptionally and post-transcriptionally. ANP may help to balance NO production of activated macrophages and thus may allow successful immune response without adverse effects on host cells.

Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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