Developmental effects of trimethyltin intoxication in the neonatal mouse. I. Light microscopic studies
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Abstract:
The effects of trimethyltin (TMT) intoxication on the developing mouse brain were studied. BALB/c mice were injected intraperitoneally with 3.0 mg TMT/kg body weight on postnatal day 3. Animals were sacrificed at selected intervals to 30 days of age and their brains examined by light microscopy. Increased eosinophilia and granularity of hippocampal pyramidal neurons and neurons of the pyriform cortex were detected as early as 16 hours post-administration. Extensive degenerative and necrotic charges were observed 1 to 10 days post-administration, particularly in hippocampal region CA-3 of Ammon's horn. Cerebellar Purkinje and granule neurons, basal ganglia and cerebral cortex were involved to a lesser extent. Pathological changes of granule cells in the fascia dentata were much less extensive than reported in adult mice. Astrogliosis was occasionally pronounced. Distribution of lesions within the hippocampus indicate that acute neonatal TMT exposure results in a different regional pattern of injury than in acutely treated adult mice.
Insights
Trimethyltin (TMT) intoxication causes significant brain damage in developing mice, particularly affecting the hippocampus. Neonatal TMT exposure leads to a distinct pattern of neurotoxicity compared to adults.
Area of Science:
- Neuroscience
- Toxicology
- Developmental Biology
Background:
- Trimethyltin (TMT) is a known neurotoxicant.
- Understanding TMT's effects on the developing brain is crucial for assessing potential developmental risks.
Purpose of the Study:
- To investigate the neuropathological effects of acute trimethyltin (TMT) intoxication on the developing mouse brain.
- To compare the regional susceptibility and pattern of TMT-induced neurotoxicity in neonatal versus adult mice.
Main Methods:
- BALB/c mice were administered TMT (3.0 mg/kg) on postnatal day 3.
- Brain tissues were examined using light microscopy at various intervals up to 30 days of age.
Main Results:
- Early signs of neuronal damage (eosinophilia, granularity) were observed in the hippocampus and pyriform cortex within 16 hours.
- Extensive degeneration and necrosis were prominent in hippocampal region CA-3 between 1 and 10 days post-administration.
- Cerebellum, basal ganglia, and cerebral cortex showed less severe involvement; hippocampal damage pattern differed from adult mice.
Conclusions:
- Acute neonatal TMT exposure induces significant neuropathology in the developing mouse brain.
- The regional pattern of hippocampal injury in neonates differs from that observed in adult mice.
- These findings highlight the distinct vulnerability of the developing brain to TMT neurotoxicity.