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The Journal of Immunology, Vol 154, Issue 1 308-317, Copyright © 1995 by American Association of Immunologists
ARTICLES |
CK Derian, RJ Santulli, PE Rao, HF Solomon and JA Barrett
R. W. Johnson Pharmaceutical Research Institute, Spring House, PA 19477.
An early event associated with neutrophil-dependent tissue damage involves the adhesion of neutrophils to the vascular endothelium and the subsequent release of oxygen-derived free radicals and granule constituents. Elevations in intracellular cAMP are known to inhibit free radical release but not lysosomal enzyme release. The role of cAMP in FMLP-induced neutrophil adhesion was examined in this study by using an in vitro model of neutrophil-endothelial cell adhesion. FMLP stimulated a time- and concentration-dependent increase in human neutrophil adhesion to HUVEC. FMLP-mediated adhesion was inhibited by a diverse group of cAMP modulators: forskolin, isoproterenol, phosphodiesterase IV inhibitors (rolipram and Ro 20-1724), but not phosphodiesterase III inhibitors (milrinone and bemoradan). Endogenous adenosine has previously been shown to mediate FMLP-induced increases in cAMP enhanced in the presence of Ro 20-1724. In this study, adenosine deaminase prevented the inhibitory effects observed with rolipram and Ro 20-1724, implicating endogenous adenosine as a co- modulator of inhibition. FMLP stimulated neutrophil shape change and the surface expression of the beta 2 integrins CD11b/CD18 and CD11a/CD18. Both these responses were inhibited by rolipram but not bemoradan. With the use of 4,4'-diisothiocyanostilbene-2,2'disulfonic acid, we showed that mobilization of the intracellular pool of CD11b/CD18 paralleled adhesion. We conclude that neutrophil-endothelial cell adhesion is attenuated by elevating neutrophil intracellular cAMP and that inhibition of neutrophil CD11b/CD18 surface expression by cAMP accounts for this observed inhibition of adhesion.
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