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In vitro fluoride toxicity in human spermatozoa
1Department of Zoology, School of Sciences, Gujarat University, Ahmedabad, India.
Reproductive Toxicology (Elmsford, N.Y.)
|March 1, 1994
Summary
Sodium fluoride (NaF) exposure in vitro negatively impacts human sperm motility and morphology. High doses of NaF lead to enzyme alterations, glutathione depletion, and significant sperm damage.
Area of Science:
- Reproductive Biology
- Toxicology
- Biochemistry
Background:
- Sodium fluoride (NaF) is a common environmental and industrial chemical.
- Its effects on human spermatozoa require detailed investigation for reproductive health assessment.
Purpose of the Study:
- To investigate the in vitro effects of varying sodium fluoride concentrations on human sperm.
- To assess the impact of NaF on sperm motility, enzyme activity, glutathione levels, and morphology over time.
Main Methods:
- Washed human ejaculated spermatozoa were exposed to 25, 50, and 250 mM NaF.
- Evaluations included extracellular pH, acid phosphatase (ACPase) and hyaluronidase activity, sperm morphology (Silver nitrate staining), glutathione levels, and motility.
- Measurements were taken at 5, 10, and 20 minutes post-exposure.
Main Results:
- NaF (250 mM) caused slight extracellular acidification.
- Lysosomal enzyme activities (ACPase, hyaluronidase) initially increased then decreased, suggesting membrane damage at 20 min.
- Significant morphological abnormalities (head elongation, deflagellation, acrosome loss, tail coiling), glutathione depletion, and reduced sperm motility were observed, particularly at 250 mM NaF.
Conclusions:
- Sodium fluoride exposure induces significant oxidative stress and morphological damage in human spermatozoa.
- NaF effectively reduces sperm motility and viability in a dose- and time-dependent manner.
- These findings highlight the potential reproductive toxicity of NaF.