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• W2014336274 abstract "We have described the different patterns of chlortetracycline (CTC) binding to ram spermatozoa, immediately after ejaculation and upon in vitro capacitation and calcium ionophore-induced acrosomal exocytosis. Four different forms of CTC distribution were found. Form I showed an even distribution of fluorescence over the entire head, with a brighter band in the equatorial region. In Form II, uniform fluorescence was observed without equatorial band. Form III consisted of fluorescence in the anterior portion of the head. Form IV showed no fluorescence over the head. In all cases, fluorescence in the middle piece of the flagellum was observed as well. Immediately after ejaculation, Form I was the most abundant one (78%) in fresh semen with Forms II and III being relatively scarce (less than 15%). Form IV was virtually absent or appeared only occasionally. Incubation under in vitro capacitating conditions led to a significant decrease in Form I and to a significant increase in Forms II and III. Form II was mainly associated to intact acrosomes, while most spermatozoa in Form III showed intermediate forms of acrosomal status. Incubation of spermatozoa with the calcium ionophore A23187 resulted in 55% of spermatozoa showing Form IV, suggesting that it represents the acrosome-reacted stage. Form I was abruptly decreased at 30 min of incubation and was neglectible after 60 min. In contrast, Forms II and III increased at 30 min but decreased later on, suggesting that both forms represent intermediate stages before the acrosomal exocytosis. Analysis of acrosomal status in spermatozoa from individual CTC forms revealed that all spermatozoa that remained in Form II after incubation had intact acrosomes. Intermediate stages were predominant in Form III-spermatozoa, while most Form IV-spermatozoa underwent full acrosomal exocytosis. These results show that CTC binding can be used to monitor changes in ram spermatozoa during capacitation and acrosome-reaction." @default.
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• W2014336274 date "1996-04-01" @default.
• W2014336274 modified "2023-09-26" @default.
• W2014336274 title "In vitro capacitation and induction of acrosomal exocytosis in ram spermatozoa as assessed by the chlortetracycline assay" @default.
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• W2014336274 doi "https://doi.org/10.1016/0093-691x(96)00031-3" @default.
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