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- W2068339211 abstract "We investigated the effect of gonadotropins on protease that were suggested to be implicated in the invasive activity of the trophoblast. hCG levels ranging from 10 x 10(3) to 333 x 10(3) IU/L produced a dose-dependent inhibition of the in vitro globinolytic activity of the purified proteases trypsin, chymotrypsin, and urokinase, but failed to inhibit plasmin, collagenase, elastase, and tissue-type plasminogen activator. Likewise, FSH inhibited purified trypsin and urokinase, but not plasmin or tissue-type plasminogen activator. Culture medium conditioned with human trophoblast displayed serine protease and urokinase-like activities; exposure of the cultured trophoblast to exogenous hCG markedly suppressed serine protease and urokinase activities in the conditioned medium. A short treatment of the conditioned medium with trypsin abolished the hCG-mediated inhibition of urokinase activity. The present findings offer an explanation for earlier observations that hCG reduced collagenase activity in trophoblasts without affecting the level of collagenase-specific mRNA. The present results are also consistent with the concept that hCG, by its direct ability to inhibit certain serine proteases and urokinase in trophoblast, suppresses a protease-mediated conversion of procollagenase to active collagenase. The ability of hCG to prevent initiation of the collagenolytic cascade suggests that gonadotropins may regulate the transient invasive activity of the trophoblast." @default.
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- W2068339211 date "1993-05-01" @default.
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- W2068339211 title "Gonadotropin-mediated inhibition of proteolytic enzymes produced by human trophoblast in culture." @default.
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- W2068339211 doi "https://doi.org/10.1210/jcem.76.5.7684389" @default.
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