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Human Reproduction, Vol. 5, No. 1, pp. 71-74, 1990
© 1990 European Society of Human Reproduction and Embryology

research-article

Variation in the cholesterol/phospholipid ratio in human spermatozoa and its relationship with capacitation

Kazuhiko Hoshi, Tomiko Aita, Kaoru Yanagida, Nobuhiro Yoshimatsu and Akira Sato

Department of Obstetrics and Gynaecology, Fukushima Medical College Fukushima 960-12, Japan

The cholesterol/phospholipid (C/PL) ratio was determined for spermatozoa from eight men with normal semen parameters. There was a close correlation between the C/PL ratio and the rate of sperm capacitation as assessed by the hamster egg penetration test. A lower C/PL ratio correlated with a faster capacitation time. This supports the notion that the loss or reduction of membrane cholesterol constitutes an important step of capacitation in human spermatozoa.

Key words: spermatozoa/cholesterol/capacitation/hamster test


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