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Bull spermatozoa under mercury stress
1Andrology Laboratory, Department of Biology, Shahrekord University, Shahrekord, Iran. mehranarabi@hotmail.com
Reproduction in Domestic Animals = Zuchthygiene
|September 10, 2005
Summary
Mercuric chloride exposure significantly damages bull sperm by increasing lipid peroxidation and DNA breaks, while reducing viability and glutathione. This highlights mercury
Area of Science:
- Environmental Toxicology
- Reproductive Biology
- Spermatozoa Function
Background:
- Male infertility is often linked to defective sperm function, posing significant treatment challenges.
- Environmental factors, including heavy metals, are increasingly recognized for their impact on reproductive health.
Purpose of the Study:
- To investigate the in vitro effects of mercuric chloride (HgCl2) on bull spermatozoa.
- To assess the impact of HgCl2 on sperm membrane integrity, DNA integrity, viability, reduced glutathione (GSH) content, and acrosomal status.
Main Methods:
- Bull spermatozoa were exposed to varying concentrations of HgCl2 (50-300 micromol/l).
- Sperm analyses included lipid peroxidation (LPO) rate, spermatocrit, reduced glutathione (GSH) content, Comet assay (single-cell gel electrophoresis) for DNA integrity, and gelatin test for acrosomal status.
Main Results:
- HgCl2 significantly increased LPO and decreased sperm viability, with a strong negative correlation (r = -0.9, p < 0.001).
- GSH content was impaired, and HgCl2 induced DNA breaks (90% double-stranded) in sperm nuclei, correlating positively with LPO (r = 0.9, p < 0.001).
- Acrosomal integrity was altered, indicated by abnormal acrosome reactions and a strong negative correlation between LPO and halo percentage (r = -0.9, p < 0.001).
Conclusions:
- Mercury acts as a potent oxidant, detrimentally affecting bull spermatozoa.
- Given mercury's widespread use, its potential to impair sperm function warrants significant concern as an environmental factor.