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Methylmercury- and mercuric-chloride-induced alterations in rat epididymal sperm
A R Chowdhury1, S Makhija, K D Vachhrajani
1National Institute of Occupational Health, Indian Council of Medical Research, Ahmedabad.
Abstract:
Four-week-old male albino rats weighing 70 +/- 5 g were treated intraperitoneally daily with 0, 5 and 10 micrograms methylmercuric chloride (MMC)/kg or 0, 50 and 100 micrograms mercuric chloride (MC)/kg body weight, respectively, over a period of 90 days. Studies were carried out a intermittent intervals, i.e. on days 0, 15, 30, 60 and 90 of the experiment. Gradual decrements in body and epididymal weights were observed from day 30 onwards in both the MMC- and MC-treated groups. Morphological deformations of epididymal epithelium were noted from day 30 onwards in the mercurial-treated groups. MMC treatment caused severe degeneration of the epididymal epithelium on days 60 and 90 in comparison to MC treatment. Total sperm count was significantly less in the MC-treated groups, while motile sperm count was affected most in the MMC-administered groups. The frequency of sperm abnormality increased consistently at both doses of mercurial treatment over a period of 90 days. Maximum sperm abnormality among the treated groups was noted in the groups given 10 micrograms MMC/kg. The observations revealed that MMC and MC have variable potency to alter epididymal structure and the sperm.
Insights
Methylmercuric chloride (MMC) and mercuric chloride (MC) exposure in rats caused reduced body weight and epididymal damage. MMC more severely impacted sperm motility and epididymal structure than MC.
Area of Science:
- Toxicology
- Reproductive Biology
- Environmental Health
Background:
- Mercury compounds, including methylmercuric chloride (MMC) and mercuric chloride (MC), are environmental contaminants with known toxicity.
- Understanding the specific effects of different mercury forms on male reproductive health is crucial for risk assessment.
Purpose of the Study:
- To investigate and compare the effects of chronic methylmercuric chloride (MMC) and mercuric chloride (MC) exposure on the male reproductive system of rats.
- To evaluate the impact of these mercury compounds on body weight, epididymal morphology, sperm count, motility, and abnormality.
Main Methods:
- Adult male albino rats were administered daily intraperitoneal injections of varying doses of MMC (0, 5, 10 µg/kg) or MC (0, 50, 100 µg/kg) for 90 days.
- Body weight, epididymal weight, and sperm parameters (count, motility, abnormality) were assessed at intervals (0, 15, 30, 60, 90 days).
- Epididymal tissue morphology was examined for signs of degeneration or damage.
Main Results:
- Both MMC and MC treatments led to gradual decrements in body and epididymal weights starting from day 30.
- Morphological deformations of the epididymal epithelium were observed in both treatment groups from day 30 onwards.
- MMC exposure resulted in more severe epididymal epithelial degeneration on days 60 and 90 compared to MC.
- MC treatment significantly reduced total sperm count, while MMC primarily affected sperm motility.
- Sperm abnormality frequency increased with both treatments over 90 days, with the highest abnormality seen at 10 µg/kg MMC.
Conclusions:
- Methylmercuric chloride (MMC) and mercuric chloride (MC) exhibit differential toxicity towards the male reproductive system in rats.
- MMC appears to be more potent in causing severe epididymal damage and affecting sperm motility, while MC significantly impacts sperm count.