Hemolytic plaque formation by leukocytes in vitro. Control by vasoactive hormones

The Journal of Clinical Investigation
K L MelmonS Bauminger

Abstract

Histamine, beta-adrenergic amines, and prostaglandins inhibited hemolytic plaque formation by splenic leukocytes from immunized mice. The same agents had previously been shown to prevent both the IgE-mediated release of histamine from human basophils and the immunologically specific cytolytic activity of murine lymphocytes, through stimulation of the production of cyclic AMP in leukocytes. We therefore tested the hypothesis that cyclic AMP might mediate an inhibitory effect of these drugs by comparing the ability of these agents to inhibit plaque formation with their effects on cyclic AMP accumulation in leukocytes. In splenic cells from three mouse strains, the dose-dependent effects of these agents of cyclic AMP correlated with their inhibition of plaque formation. Beta- but not alpha-adrenergic agonists were effective in both systems, and the effects of isoproterenol were inhibited by propranolol. Histamine was approximately equipotent with isoproterenol in both systems. Two prostaglandins (E(1) and E(2)) were effective in both systems, but prostaglandin F(2alpha) was not. Dibutyryl cyclic AMP, a lipid-soluble analog of the endogenous nucleotide, inhibited plaque formation by cells of all three strains. Theophylline, an inhi...Continue Reading

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