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- W2001960957 abstract "In this study we developed a single cell analysis protocol with which protein tyrosine kinase (PTK)-dependent and independent Ca2+ fluxes occurring in human spermatozoa in response to progesterone were evaluated. By recording the fluorescence emitted by fluo-3-loaded spermatozoa using a confocal laser scanning microscopy system it was possible not only to monitor relative changes in the intracellular free Ca2+ concentration ([Ca2+]i) but also to determine the time at which the acrosomal exocytosis began. The addition of progesterone produced a rapid transient [Ca2+]i increase in 35% of spermatozoa. In ∼10% of spermatozoa, this initial [Ca2+]i increase was followed by a secondary [Ca2+]i increase beginning 2–10 min after the progesterone addition and leading to the acrosomal exocytosis in most of these spermatozoa. On the other hand, a rapid triggering of exocytosis during the initial [Ca2+]i increase was a relatively infrequent observation. The inhibition of PTK with genistein or herbimycin A did not influence the initial progesterone-induced [Ca2+]i increase but inhibited the secondary [Ca2+]i increase and the ensuing acrosomal exocytosis. The initial PTK-independent Ca2+ response could be induced by progesterone in both non-capacitated and capacitated spermatozoa, whereas the ability to generate the secondary, PTK-dependent response developed during in-vitro capacitation." @default.
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- W2001960957 date "1996-04-01" @default.
- W2001960957 modified "2023-10-11" @default.
- W2001960957 title "Regulators of sperm function" @default.
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- W2001960957 doi "https://doi.org/10.1093/molehr/2.4.225" @default.
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