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Trimethyltin-induced hyperactivity: time course and pattern

P H Ruppert, T J Walsh, L W Reiter

    Neurobehavioral Toxicology and Teratology
    |March 1, 1982
    PubMed
    Summary
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    Trimethyltin chloride (TMT) causes hyperactivity in adult male rats, particularly at higher doses. This neurotoxicity is linked to significant neuronal cell loss in the hippocampus.

    Area of Science:

    • Neuroscience
    • Toxicology
    • Behavioral Science

    Background:

    • Trimethyltin chloride (TMT) is a known neurotoxicant.
    • Understanding TMT's effects on behavior and brain structure is crucial for assessing neurotoxicity.

    Purpose of the Study:

    • To investigate the behavioral effects of varying doses of TMT in adult male rats.
    • To examine the long-term activity patterns and spatial activity changes induced by TMT.
    • To correlate behavioral changes with hippocampal neuronal damage.

    Main Methods:

    • Adult male Long-Evans rats were administered different doses of TMT (0, 5, 6, or 7 mg/kg).
    • Locomotor activity was assessed in a figure-eight maze at multiple time points post-dosing (days 0, 4, 8, 16, 32, and a 23-hr test on days 49-51).

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  • Hippocampal neuronal cell loss was confirmed by measuring the length of the pyramidal cell line (CA1 to CA3c).

    • Main Results:

    • No significant activity differences were observed on the day of dosing.
    • Rats receiving 7 mg/kg TMT exhibited hyperactivity on all subsequent test days.
    • TMT altered activity patterns, increasing exploration in the central maze area while sparing blind alleys.
    • A 23-hour activity test showed sustained hyperactivity in TMT-treated rats.
    • Histological analysis confirmed dose-dependent neuronal cell loss in the hippocampus (CA1-CA3c).

    Conclusions:

    • TMT induces significant, dose-dependent hyperactivity in adult male rats.
    • The observed hyperactivity is associated with specific alterations in spatial activity patterns.
    • Hippocampal neuronal damage is a key correlate of TMT-induced behavioral changes.