Elsevier

Peptides

Volume 17, Issue 2, 1996, Pages 219-224
Peptides

Article
Modulation of murine peritoneal macrophage functions by gastrin

https://doi.org/10.1016/0196-9781(95)02133-7Get rights and content

Abstract

The effect in vitro of gastrin-17 and gastrin-34 was studied at concentrations from 10−12 to 10−6 M on several functions of resting peritoneal macrophages from BALB/c mice: adherence to substrate, mobility (spontaneous and directed by chemical gradient or chemotaxis), and ingestion of inert particles (latex beads) or cells (Candida albicans). Both gastrins, at concentrations from 10−10 to 10−8 M, inhibited significantly all functions studied with the exception of adherence, which was increased. A dose-response relationship was observed, with a maximum inhibition of macrophage functions found at 10−9 M. These peptides induced in murine macrophages a significant increase of cAMP levels at 60 and 120 s. Adenosine, an adenylate cyclase inhibitor, significantly increased the ingestion of latex beads, whereas the combined presence of adenosine and either G-17 or G-34 produced similar values to those of control samples without adenosine or gastrin. These results suggest that gastrin is a negative modulator of several macrophage functions, and that the inhibition of these activities is carried out through an increase of intracellular cAMP levels.

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