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J. Biol. Chem., Vol. 262, Issue 23, 10903-10906, 08, 1987
JT Queenan Jr, LC Kao, CE Arboleda, A Ulloa-Aguirre, TG Golos, DB Cines and JF Strauss 3d
Cultured human cytotrophoblasts synthesize and secrete urokinase-type plasminogen activator (uPA) during the first 24 h of culture, but secretion declines during the subsequent day. In contrast, synthesis and secretion of fibronectin increases during the 2 days of culture. The levels of uPA mRNA parallel the changes in synthesis and secretion of uPA. Treatment of cytotrophoblasts with 8-bromo-cAMP (1.5 mM) transiently raises uPA mRNA levels and uPA secretion. This treatment reduces fibronectin mRNA levels and causes a sustained increase in beta chorionic gonadotropin mRNA content and chorionic gonadotropin secretion. We conclude that a cAMP-mediated process up-regulates uPA expression in cytotrophoblasts. However, the stimulatory effect of the cyclic nucleotide analog on uPA is transient.
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