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Chronic manganese oxide administration to preweanling rats: manganese accumulation and distribution
Abstract:
Mn accumulation was evaluated in selected tissues of preweanling rats dosed daily with particulate Mn3O4. Significant findings include a high rate of Mn accumulation in the preweanling rat; a Mn dose-related acceleration of postpartum liver iron depletion; a Mn dose-related depression in red blood cells, hematocrit, hemoglobin, body weight, and survival by 21 d postpartum; and a Mn distribution in tissues with liver greater than brain greater than or equal to kidney greater than testes at 18-21 d of age.
Insights
This study shows that young rats accumulate manganese (Mn) rapidly, leading to iron depletion and reduced health indicators. Manganese exposure negatively impacts red blood cells, body weight, and survival in preweanling rats.
Area of Science:
- Environmental toxicology
- Developmental toxicology
- Nutritional biochemistry
Background:
- Manganese (Mn) is an essential trace element, but excessive exposure can be toxic.
- Preweanling animals are particularly vulnerable to environmental toxicants.
- Understanding Mn accumulation and its effects in early development is crucial for risk assessment.
Purpose of the Study:
- To investigate the accumulation of manganese (Mn) in tissues of preweanling rats.
- To assess the dose-related effects of particulate manganese tetroxide (Mn3O4) on physiological parameters.
- To determine the tissue distribution of Mn in young rats.
Main Methods:
- Daily dosing of preweanling rats with particulate Mn3O4.
- Monitoring of Mn accumulation in selected tissues.
- Evaluation of hematological parameters, body weight, survival rates, and iron levels.
- Analysis of Mn distribution across different tissues.
Main Results:
- High rate of Mn accumulation observed in preweanling rats.
- Mn exposure dose-dependently accelerated postpartum liver iron depletion.
- Significant dose-related decreases in red blood cells, hematocrit, hemoglobin, body weight, and survival by 21 days postpartum.
- Mn tissue distribution followed the order: liver > brain ≥ kidney > testes.
Conclusions:
- Preweanling rats exhibit rapid Mn accumulation with significant adverse health effects.
- Manganese exposure disrupts iron homeostasis and negatively impacts hematological parameters and overall development.
- The study highlights the vulnerability of young animals to manganese toxicity and provides data on its tissue distribution.