Activity changes in rats following acute trimethyltin exposure

Area of Science:

• Neuroscience
• Toxicology
• Behavioral Science

Background:

• Trimethyltin (CH3)3Sn is an organometallic compound known to induce central nervous system (CNS) damage.
• Intragastric administration of trimethyltin can lead to observable morphological alterations in the CNS.

Purpose of the Study:

• To investigate the behavioral consequences of intragastric trimethyltin chloride ((CH3)3SnCl) administration in male rats.
• To assess the impact of (CH3)3SnCl on open-field activity and operant conditioning.

Main Methods:

• Male Long-Evans rats were divided into two groups, receiving either (CH3)3SnCl (7.0 mg/kg) or saline via intragastric injection.
• Open-field activity was measured after 40 days.
• Subsequent operant conditioning involved lever pressing for food reinforcement on a fixed-ratio schedule.

Main Results:

• Trimethyltin-treated rats displayed threefold higher activity in the open field compared to controls.
• (CH3)3SnCl-treated rats showed significantly elevated lever-pressing rates across all fixed-ratio schedules.
• These neurobehavioral changes persisted regardless of the reinforcement schedule.

Conclusions:

• Intragastric trimethyltin administration induces significant and potentially permanent neurobehavioral alterations in rats.
• The observed hyperactivity and altered operant responding suggest widespread CNS disruption.
• Further research is warranted to understand the neuropathological basis and long-term implications of tin-induced neurotoxicity.