Behavioral toxicity of trialkyltin compounds: a review

Area of Science:

• Neurotoxicology
• Environmental Health
• Pharmacology

Background:

• Organotin compounds, specifically triethyltin (TET) and trimethyltin (TMT), are known neurotoxins.
• These compounds exhibit differential toxicity patterns in adult animal models.
• Understanding these distinct neurotoxic effects is crucial for assessing environmental and occupational health risks.

Purpose of the Study:

• To investigate and compare the distinct neurobehavioral toxicity profiles of triethyltin (TET) and trimethyltin (TMT) in adult animals.
• To correlate observed behavioral deficits with known neuropathological changes induced by TET and TMT.
• To determine the reversibility of behavioral impairments following cessation of exposure.

Main Methods:

• Administration of TET and TMT to adult animal models.
• Assessment of various behavioral parameters including motor activity, grip strength, operant responding, startle response, learning, and performance.
• Correlation of behavioral data with histopathological findings, such as myelin vacuolation, cerebral edema, and neuronal cell death.

Main Results:

• Triethyltin (TET) exposure resulted in decreased motor activity, grip strength, operant response rate, and startle response amplitude, indicative of impaired neuromotor function.
• These TET-induced deficits were associated with myelin vacuolation and cerebral edema.
• Trimethyltin (TMT) exposure led to hyperactivity and significant impairments in learning and performance, consistent with neuronal cell death, particularly in limbic structures.

Conclusions:

• Triethyltin (TET) and trimethyltin (TMT) exert distinct neurotoxic effects, impacting neuromotor function and cognitive processes, respectively.
• The behavioral deficits induced by repeated TET exposure are reversible upon cessation of dosing.
• The behavioral impairments caused by a single TMT exposure appear to be irreversible, suggesting a more permanent neurotoxic mechanism.