PMID: 61067Jun 1, 1976Paper

Macrophage plasminogen activator: modulation of enzyme production by anti-inflammatory steroids, mitotic inhibitors, and cyclic nucleotides

Cell
J D VassalliE Reich

Abstract

Plasminogen activator production by cultured mouse peritoneal macrophages can be modulated in vitro by low concentrations of various pharmacologically active molecules. Glucocorticoid hormones and their synthetic derivatives, as well as cholera toxin, colchicine, and vinblastine markedly inhibit production of this enzyme without affecting other important macrophage functions. The effect of glucocorticoids is of particular interest, both because their relative in vivo anti-inflammatory potencies correlate exactly with their effect on plasminogen activator production in culture and because this effect occurs at near physiological concentrations. In view of the correlations established in other systems between plasminogen activator production and cell migration, we have also examined the age of the macrophages in thioglycollate-induced exudates. Confirming the results of Van Furth and Cohn (1968), we have found that the majority of these cells are young, having recently replicated and arrived in the peritoneal cavity. Using a fibrinagar overlay technique which allowed us to determine the production of plasminogen activator by individual cells. we have found that the majority of these cells produce the enzyme. The potential roles o...Continue Reading

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