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Regulation of plasminogen activation in rat cell lines
J H Reinders1, P Kaczmarek, J J van Giezen
1Solvay Duphar B.V., Department of Vascular Pharmacology, DA Weesp, The Netherlands.
Abstract:
The regulation of plasminogen activators (PA) and their inhibitors (PAI) in the rat cell lines: HTC and L2 was studied. HTC plasminogen activator inhibitor type 1 (PAI-1) production was stimulated by dexamethasone, serum factors and insulin; that of tissue-type plasminogen activator (tPA) by cAMP raising agents. Retinoic acid, butyrate, phorbol ester and endotoxin did not affect net PA/PAI activity elaborated by HTC. L2 cells produced tPA, which production was stimulated by retinoic acid, phorbol myristate acetate, butyrate and cAMP; serum factors blunted their response, whereas in the synthetic serum substituting medium Ultraculture and with cocktail Ultroser the action of tPA stimulators was enhanced.