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Toxicity of methoxyacetic acid in rats
Abstract:
Male Fischer 344 rats were given eight daily doses of 0, 30, 100 or 300 mg/kg methoxyacetic acid by gavage. The high dose resulted in decreased body weight, severe degeneration of testicular germinal epithelium, decreased size of the thymus with depletion of thymic cortical lymphoid elements, and reductions in bone marrow cellularity resulting in depressions of red blood cell counts, hemoglobin concentration, packed cell volume, and white blood cell counts. Some of these observations were apparent to a lesser degree in rats given 100 mg/kg. The low dose produced no apparent effects during the course of the study. These toxicological properties of methoxyacetic acid are remarkably similar to ethylene glycol monomethyl ether (EGME), and the adverse effects of EGME in rats are probably the result of in vivo bioactivation of EGME to methoxyacetic acid.
Insights
Methoxyacetic acid exposure in male rats caused significant testicular damage, thymus shrinkage, and reduced blood cell counts. These toxic effects highlight methoxyacetic acid
Area of Science:
- Toxicology
- Reproductive Toxicology
- Hematology
Background:
- Ethylene glycol monomethyl ether (EGME) exhibits significant toxicity in animal models.
- The in vivo bioactivation of EGME to methoxyacetic acid is a suspected mechanism for its adverse effects.
Purpose of the Study:
- To investigate the toxicological profile of methoxyacetic acid in male Fischer 344 rats.
- To compare the toxicity of methoxyacetic acid with known effects of EGME.
Main Methods:
- Male Fischer 344 rats were administered daily oral gavage doses of methoxyacetic acid (0, 30, 100, or 300 mg/kg) for eight days.
- Comprehensive toxicological assessments were performed, including body weight, organ weights (thymus), and hematological parameters.
Main Results:
- High-dose (300 mg/kg) methoxyacetic acid induced severe testicular germinal epithelium degeneration, thymus atrophy, reduced bone marrow cellularity, and significant decreases in red blood cells, hemoglobin, packed cell volume, and white blood cells.
- A dose of 100 mg/kg showed similar but less severe effects.
- The lowest dose (30 mg/kg) did not produce apparent adverse effects.
Conclusions:
- Methoxyacetic acid exhibits significant dose-dependent toxicity in male rats, affecting the reproductive system, immune system (thymus), and hematopoietic system.
- The observed toxicological effects of methoxyacetic acid are highly similar to those of EGME, supporting the hypothesis that methoxyacetic acid is the active metabolite responsible for EGME toxicity.