Human Reproduction, Vol. 16, No. 9, 1922-1930,
September 2001
© 2001 European Society of Human Reproduction and Embryology
Differential production of reactive oxygen species by subsets of human spermatozoa at different stages of maturation
1 Center for Advanced Research in Human Reproduction and Infertility, Urological Institute, The Cleveland Clinic Foundation, Cleveland, OH and 2 Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
BACKGROUND: Reactive oxygen species (ROS)-mediated damage to human spermatozoa has been implicated in the pathogenesis of male infertility. Although ROS production by human spermatozoa has been extensively studied, the cell-to-cell variation in ROS production by spermatozoa at different stages of maturation has never been investigated. METHODS: In this study, we determined ROS production by subsets of human spermatozoa at different stages of maturation isolated by density gradient centrifugation of ejaculated spermatozoa obtained from healthy donors and from patients attending a clinic for infertility screening. RESULTS: Four different fractions were obtained. ROS production was highest in immature spermatozoa with abnormal head morphology and cytoplasmic retention and lowest in mature spermatozoa and immature germ cells (P < 0.01). ROS production was highest in immature spermatozoa from males with abnormal semen parameters compared with donors (P < 0.0001) or patients with normal semen parameters (P = 0.015). ROS production by immature spermatozoa was inversely correlated with the recovery of motile, mature spermatozoa in the high density fraction 4 (P = 0.01). CONCLUSIONS: The results of this study indicate that there is significant cell-to-cell variation in ROS production in subsets of spermatozoa at different stages of maturation and that oxidative damage of mature spermatozoa by ROS-producing immature spermatozoa during sperm migration from the seminiferous tubules to the epididymis may be an important cause of male infertility.
Key words: ISolate gradient/lipid peroxidation/ROS/sperm maturation/spermatozoa
3 To whom correspondence should be addressed at: Center for Advanced Research in Human Reproduction and Infertility, Urological Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A19.1, Cleveland, OH 44195, USA. E-mail: agarwaa{at}ccf.org
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