Inhibition of C protein in human sperm and its influence on acrosome reaction and zona pellucida binding

被引:31
作者
Franken, DR
Morales, PJ
Habenicht, UF
机构
[1] TYGERBERG HOSP,DEPT OBSTET & GYNAECOL,TYGERBERG,SOUTH AFRICA
[2] CATHOLIC UNIV CHILE,FAC BIOL SCI,ENDOCRINOL LAB,SANTIAGO,CHILE
[3] ERNST SCHERING RES FDN,BERLIN,GERMANY
关键词
G-proteins; human acrosome reaction; zona binding;
D O I
10.1016/S0015-0282(16)58698-1
中图分类号
R71 [妇产科学];
学科分类号
100211 ;
摘要
Objective: To evaluate human sperm acrosomal status, zona pellucida (ZP)-binding capacity, and sperm motion characteristics after treatment with pertussis toxin followed by exposure to increasing concentrations of solubilized human ZP. Design: Prospective analytical study. Setting: Normal human sperm donors in an academic research environment. Intervention: Sperm were prepared with a wash and swim-up method and treated with a final concentration of 100 ng/mL pertussis toxin. Acrosomal status were determined using a Pisum sativum agglutinin-fluorescien-isothiocyanate method after exposure of sperm to 0.25, 0.5, 0.75, and 1.00 ZP/mu L solutions of human ZP. Zona binding potential was recorded using intact zona-binding assays. Motion characteristics were recorded with a semen analyzer. Main Outcome Measure: Percentage acrosome-reacted sperm, number of zona-bound sperm, and sperm motion parameters. Results: Spermatozoa treated with 100 ng/mL pertussis toxin, followed by ZP-mediated acrosome reaction induction, showed a significant decrease in the percentage of acrosome-reacted sperm compared with untreated controls. Motion characteristics of S-hour capacitated sperm after treatment with either phosphate-buffered saline (PBS) or pertussis toxin were not different. Pertussis toxin-treated sperm populations bound significantly more sperm to the ZP after 4 hours incubation compared with the PBS-control groups: 137.1 +/- 8.0 compared with 96.3 +/- 7.0 (mean +/- SEM). Conclusions: The data support the concept of the controlling mechanism and importance of G proteins during the ZP-mediated acrosome reaction. Intact acrosomes correlate with and are needed to ensure tight zona binding.
引用
收藏
页码:1009 / 1011
页数:3
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