Acrosin accelerates the dispersal of sperm acrosomal proteins during acrosome reaction.

The Journal of Biological Chemistry
K YamagataT Baba

Abstract

Using homologous recombination, we have previously produced male mice carrying a disruptive mutation (Acr-/-) in the acrosin gene. Although Acr-/- mouse sperm lacking the acrosin protease activity still penetrated the zona pellucida and fertilized the egg, the mutant sperm exhibited a delay in penetration of the zona pellucida solely at the early stages after insemination. To further elucidate the role of acrosin in fertilization, we have examined the involvement of acrosin in the acrosome reaction of sperm using the Acr-/- mutant mice. When the ability of sperm to adhere (attach) and bind to the zona pellucida of cumulus-free eggs was assessed in vitro, no significant difference was observed among Acr+/+, Acr+/-, and Acr-/- mouse sperm. Immunocytochemical analysis demonstrated that the release of several acrosomal proteins from the acrosome of Acr-/- mouse sperm was significantly delayed during the calcium ionophore- and solubilized zona pellucida-induced acrosome reaction, despite normal membrane vesiculation. These data indicate that the delayed sperm penetration of the zona pellucida in the Acr-/- mouse results from the altered rate of protein dispersal from the acrosome and provide the first evidence that the major role of...Continue Reading

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