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- W2025362603 abstract "Pertussis toxin-sensitive guanine nucleotide-binding regulatory proteins (G proteins) have previously been shown to mediate the zone pellucida-induced acrosome reaction in mammalian sperm. In this study we compared the inhibitory effect of pertussis toxin on the zona-induced acrosome reaction in human spermatozoa with that on the reaction induced by progesterone, another physiological acrosome reaction-promoting stimulus associated with the ovulated oocyte. Up to the concentration of 1 microgram/ml, pertussis toxin did not produce any direct effects on the acrosome reaction frequency nor did it influence sperm movement and viability. However, preincubation of spermatozoa with the toxin at a concentration of 100 ng/ml completely abolished the increase in the acrosome reaction frequency upon subsequent exposure to solubilized zona pellucida material. In contrast, the same treatment did not impair the ability of spermatozoa to initiate the acrosome reaction in response to progesterone. Moreover, the preincubation with pertussis toxin did not modify the changes in the intracellular concentration of calcium ions occurring after progesterone addition. These data suggest that different physiological stimuli may utilize different signal transduction pathways to induce the human sperm acrosome reaction." @default.
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- W2025362603 date "1993-02-01" @default.
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- W2025362603 title "Differential sensitivity of progesterone- and zona pellucida-induced acrosome reactions to pertussis toxin" @default.
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- W2025362603 doi "https://doi.org/10.1002/mrd.1080340210" @default.
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