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• W2099018885 abstract "The onset of the zona pellucida-induced acrosome reaction in mouse sperm is marked by loss of the pH gradient existing in acrosome-intact sperm between the acidic acrosomal lumen and the suspending medium, due to pore formation between outer acrosomal and plasma membranes. In earlier work, it was shown that this pH gradient loss occurred in single sperm bound to structurally intact zonae pellucidae with a half-time of 2.1 min; the extended kinetics of this loss determined in a sperm population bound to intact zonae was due to a 180-min range of variable lag times. We hypothesized that this lag time range was due to steric constraints imposed by the three-dimensional structure of the structurally intact zona pellucida, and that this constraint should be removed in solubilized zonae. The fluorescent probe, Dapoxyl(TM) (2-aminoethyl)sulfonamide (DAES) allowed a test of this hypothesis in a population of sperm cells. It is a weak base that is non-fluorescent in aqueous solution, but which accumulates in the acidic acrosomal compartment due to the pH gradient with highly enhanced fluorescence; loss of the pH gradient leads to a decrease in fluorescence. The half-time for DAES fluorescence loss in a population of capacitated, acrosome-intact sperm in response to solubilized zona pellucida protein was 2.13 +/- 0.10 min (SEM, n = 9). The agreement between single cell and cell population kinetics validates the hypothesis of steric constraint in the structurally intact zona pellucida. The change in intracellular Ca(2+) concentration in response to solubilized zona pellucida, as monitored with fluo-3, was a rapid increase, followed by a decrease, with a half-time of 0.85 +/- 0.09 min (SEM, n = 6) to a steady state level higher than the initial level, indicating this Ca(2+) transient as the precursor reaction to onset of the zona-induced acrosome reaction." @default.
• W2099018885 created "2016-06-24" @default.
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• W2099018885 date "2000-03-01" @default.
• W2099018885 modified "2023-09-29" @default.
• W2099018885 title "Kinetics of onset of mouse sperm acrosome reaction induced by solubilized zona pellucida: Fluorimetric determination of loss of pH gradient between acrosomal lumen and medium monitored by dapoxyl (2-aminoethyl) sulfonamide and of intracellular Ca2+ changes monitored by Fluo-3" @default.
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• W2099018885 doi "https://doi.org/10.1002/(sici)1098-2795(200003)55:3<335::aid-mrd12>3.0.co;2-5" @default.
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