Methoxyethylmercury nephrotoxicity: effects on enzymuria and kidney function.

Area of Science:

• Toxicology
• Environmental Chemistry
• Pharmacology

Background:

• Fungicides containing mercury, such as methoxyethylmercury chloride, are used in agriculture.
• Understanding the toxicological profile of these compounds is crucial for risk assessment.
• Previous studies have investigated mercury chloride (HgCl2) toxicity, but data on methoxyethylmercury chloride is less extensive.

Purpose of the Study:

• To evaluate the toxic effects of methoxyethylmercury chloride in Sprague-Dawley rats.
• To assess dose-dependent changes in renal function and enzyme excretion.
• To compare the toxicity of methoxyethylmercury chloride with mercury chloride.

Main Methods:

• Four groups of rats (5 male, 5 female) received single intraperitoneal injections of 0, 0.5, 1.0, or 2.0 mg Hg/kg of methoxyethylmercury chloride.
• Urine was collected over a three-day period for analysis of enzyme levels (gamma glutamyl transferase, alkaline phosphatase) and excretion of electrolytes (Na+, Cl-, K+), urea, and creatinine.
• Total mercury excretion in urine was also measured.

Main Results:

• No significant changes were observed in rats receiving 0 or 0.5 mg Hg/kg.
• A transient increase in urinary gamma glutamyl transferase and alkaline phosphatase was noted on day 2 in rats given 1 mg Hg/kg.
• The 2.0 mg Hg/kg dose led to early increases in enzymuria (days 1 and 2) and decreased excretion of Na+, Cl-, K+, urea, and creatinine.
• Male rats exhibited higher urine enzyme and total mercury excretion compared to females.

Conclusions:

• Methoxyethylmercury chloride exhibits dose-dependent nephrotoxicity in rats.
• The observed time-related variations in enzymuria suggest the formation of potentially more toxic metabolites compared to the parent compound.
• Sex-based differences in mercury excretion warrant further investigation.