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Research Article Free access | 10.1172/JCI117367

Gene expression and secretion of atrial natriuretic peptide by murine macrophages.

A M Vollmar and R Schulz

Institute of Pharmacology, Toxicology and Pharmacy, University of Munich, Germany.

Find articles by Vollmar, A. in: PubMed | Google Scholar

Institute of Pharmacology, Toxicology and Pharmacy, University of Munich, Germany.

Find articles by Schulz, R. in: PubMed | Google Scholar

Published August 1, 1994 - More info

Published in Volume 94, Issue 2 on August 1, 1994
J Clin Invest. 1994;94(2):539–545. https://doi.org/10.1172/JCI117367.
© 1994 The American Society for Clinical Investigation
Published August 1, 1994 - Version history
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Abstract

An increased expression of atrial natriuretic peptide (ANP) has been reported in activated macrophages of the acutely involuted rat thymus. We communicate here that ANP may reflect a common constituent of macrophages, as mRNA coding for ANP is present in peritoneal- as well as in bone marrow-derived macrophages (PM, BMM). Furthermore, both types of macrophages synthesize and release ANP which was found to mainly represent the biologically active fragment ANP99-126. ANP expression in macrophages is regulated by compounds affecting the activity of these immune cells. For example, incubation of PM or BMM in vitro with LPS and zymosan, respectively, increased ANP-mRNA up to sixfold as determined by competitive PCR quantification. Exposure of macrophages to dexamethasone (Dex, 10(-7) M) elicits moderate effects (1.4-fold), while PMA (10(-7) M) failed to affect its abundance. These findings are complemented by data regarding ANP synthesis and secretion. Incubation of macrophages with LPS, Dex or a combination of both results in an up to 3.5-fold increase of intracellular ANP99-126 (basal 10 fmol/mg protein), and an up to 6.6-fold increase of its secretion (basal 40 fmol/mg protein, 24 h). Since macrophages synthesize and release ANP, the peptide may be involved in the complex mechanisms of host defense, a major function of these immune cells.

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