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• W2163114489 abstract "Hamster spermatozoa were tested for their ability to penetrate the intact cumulus matrix at low sperm:egg ratios (approximately 3:1). Uncapacitated spermatozoa attached to the surface of the cumulus and could not penetrate. Spermatozoa capacitated in vitro began to be able to penetrate after about 2 hr of preincubation, coincidentally with the first appearance of hyperactivation and spontaneous acrosome reactions. In all, 628 in vitro incubated spermatozoa were evaluated on and in cumuli: 270 could penetrate, but only ten of these were judged to have intact, “unmodified” acrosomes. Almost all spermatozoa capable of penetrating showed optically “modified” and swelling acrosomal caps, and this confirms previous observations on cumulus penetration in vivo. Penetration appeared limited to a phase in capacitation prior to completion of the acrosome reaction, as spermatozoa that had lost the acrosomal cap penetrated poorly and showed reduced viability. Penetration of the cumulus was inhibited by the hyaluronidase inhibitor sodium aurothiomalate. Cumulus penetrating ability could result either from a change in surface properties of the sperm at capacitation, which renders them less “sticky” to the matrix, or from release or activation of a “cumulus lysin.” We conclude that the ability to enter the cumulus matrix coincides with physiological changes in spermatozoa that occur during a terminal phase of capacitation preceding complete loss of the acrosomal cap, and that initiation of this process in vivo must precede sperm-zona contact." @default.
• W2163114489 created "2016-06-24" @default.
• W2163114489 creator A5024596573 @default.
• W2163114489 creator A5032980473 @default.
• W2163114489 date "1986-11-01" @default.
• W2163114489 modified "2023-10-15" @default.
• W2163114489 title "Development of ability to penetrate the cumulus oophorus by hamster spermatozoa capacitated in vitro, in relation to the timing of the acrosome reaction" @default.
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• W2163114489 doi "https://doi.org/10.1002/mrd.1120150302" @default.
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