Toluene inhalation induced epididymal sperm dysfunction in rats

Area of Science:

• Toxicology
• Reproductive Biology
• Environmental Health

Background:

• Toluene is a common solvent with widespread abuse via inhalation.
• Understanding its impact on male reproductive health and general well-being is crucial.

Purpose of the Study:

• To investigate the effects of toluene inhalation on male rat reproductive functions.
• To assess the impact of toluene exposure on general health parameters in male rats.

Main Methods:

• Male Sprague-Dawley rats were exposed to toluene vapor (0, 4000, 6000 ppm) daily for 5 weeks.
• Evaluated body weight, food consumption, organ weights (spleen, thymus), lymphocyte counts, and reproductive parameters.
• Assessed sperm count, motility, quality, and in vitro egg penetration ability.

Main Results:

• Toluene exposure suppressed body weight gain and food consumption.
• High toluene concentrations (6000 ppm) decreased spleen and thymus weights and lymphocyte counts.
• Significantly reduced epididymal sperm counts, motility, quality, and egg penetration ability; tail-less sperm heads observed.

Conclusions:

• High-concentration toluene inhalation negatively affects male rat general health.
• Toluene exposure appears to target epididymal sperm, disrupting maturation and function.
• Hormonal levels (LH, FSH, testosterone) remained unaffected, suggesting a direct impact on sperm post-testicular production.