Using the fluorescent calcium indicator fura-2, forskolin was found to dose-dependently cause an immediate increase in the concentration of intracellular free calcium of porcine cauda epididymal sperm. This stimulatory effect of forskolin is due to the enhancement of Ca2+ uptake by the verapamil-sensitive transporter on the sperm plasma membrane and results in the promotion of the sperm capacitation and subsequent acrosome reaction.
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Okamura et al. (1993) studied this question.
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