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• W2152324796 abstract "Experiments were designed to characterize the effect of progesterone on the hamster sperm acrosome reaction (AR). Progesterone stimulated exocytosis of previously capacitated spermatozoa in a dose-dependent manner. Progesterone-3-(O-carboxymethyl)oxime:BSA conjugate also induced AR when added to capacitated sperm suspensions. EGTA and La3+, added 10 min before progesterone, completely abolished the steroid-stimulatory effect. Benzamidine, a trypsin inhibitor, also inhibited AR when added to sperm cells 10 min before progesterone. This effect was avoided when spermatozoa were treated with the Ca2+ ionophore ionomycin. Conversely, the H+ ionophore FCCP, or the Na+/K+ ionophore nigericin, did not prevent the effect of the inhibitor. Results suggest that progesterone acts on the hamster sperm plasma membrane to stimulate exocytosis, which requires external Ca2+ and presumably Ca2+ influx. In addition, a sperm trypsin-like protease may be part of the mechanism by which progesterone stimulates AR. Since the ionomycin-induced AR does not require this proteolytic activity, the possible involvement of such an enzyme in the progesterone-stimulated Ca2+ influx necessary for the occurrence of AR is discussed." @default.
• W2152324796 created "2016-06-24" @default.
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• W2152324796 date "1996-11-01" @default.
• W2152324796 modified "2023-09-26" @default.
• W2152324796 title "Studies related to progesterone-induced hamster sperm acrosome reaction" @default.
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• W2152324796 doi "https://doi.org/10.1002/(sici)1098-2795(199611)45:3<313::aid-mrd8>3.0.co;2-v" @default.
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