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Human sperm endothelial nitric oxide synthase expression: correlation with sperm motility
M K O'Bryan1, A Zini, C Y Cheng
1The Population Council, Center for Biomedical Research, New York, New York, USA.
Fertility and Sterility
|December 16, 1998
Summary
Endothelial nitric oxide synthase (eNOS) in human sperm is normally found in specific areas. Aberrant eNOS expression patterns correlate with reduced sperm motility, suggesting a role in male infertility.
Area of Science:
- Reproductive biology
- Spermatozoa physiology
- Nitric oxide signaling
Background:
- Endothelial nitric oxide synthase (eNOS) is crucial in vascular function.
- Its role in human spermatozoa and correlation with sperm function remain unclear.
- Understanding eNOS localization is key to exploring male fertility factors.
Purpose of the Study:
- To characterize the expression pattern of eNOS on human spermatozoa.
- To investigate the correlation between sperm eNOS expression and sperm function, specifically motility.
Main Methods:
- Prospective, observational study conducted at a university infertility clinic.
- Semen samples from 12 nonazoospermic infertile men were analyzed.
- Spermatozoa were fractionated using Percoll gradients, and eNOS localization was assessed via immunostaining, correlated with motility.
Main Results:
- Morphologically normal spermatozoa showed eNOS staining in the postacrosomal and equatorial regions.
- Abnormally shaped spermatozoa frequently displayed aberrant eNOS staining patterns (midpiece/head).
- A significant negative correlation (r=-.46) was found between aberrant eNOS staining and sperm motility.
Conclusions:
- Specific eNOS localization on spermatozoa suggests a role in normal sperm physiology.
- Aberrant eNOS expression patterns are linked to decreased sperm motility.
- This association may involve the generation of excessive cytotoxic oxidants, impacting male fertility.