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Inhibition of 4-aminobutyric acid (GABA) turnover by chlordane
Abstract:
4-Aminobutyric acid (GABA) turnover was measured in mice 8 h after an acute injection of 1 g/kg of technical grade chlordane in corn oil. Significant decreases in GABA turnover were observed in the cortex, striatum, hippocampus and hypothalamus after chlordane treatment. A smaller, though significant, decrease was also observed in the cerebellum. These results may help to explain the hyperexcitability and convulsions observed after acute high-dose exposure to this compound.
Insights
Acute chlordane exposure significantly reduced 4-aminobutyric acid (GABA) turnover in multiple mouse brain regions. This GABA reduction may explain chlordane-induced hyperexcitability and convulsions.
Area of Science:
- Neuroscience
- Toxicology
- Biochemistry
Background:
- 4-Aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system.
- Chlordane is an organochlorine pesticide known to cause neurological effects.
Purpose of the Study:
- To investigate the effect of acute chlordane exposure on GABA turnover in specific brain regions of mice.
- To correlate changes in GABA turnover with observed neurological symptoms like hyperexcitability and convulsions.
Main Methods:
- Mice were administered a single high dose (1 g/kg) of technical grade chlordane in corn oil.
- GABA turnover was measured 8 hours post-injection in various brain regions including the cortex, striatum, hippocampus, hypothalamus, and cerebellum.
Main Results:
- Significant decreases in GABA turnover were observed in the cortex, striatum, hippocampus, and hypothalamus.
- A notable, though smaller, decrease in GABA turnover was also detected in the cerebellum.
- These neurochemical changes occurred following acute high-dose chlordane exposure.
Conclusions:
- Acute high-dose chlordane exposure disrupts GABAergic neurotransmission in the brain.
- Reduced GABA turnover is a potential mechanism underlying the hyperexcitability and convulsive effects of chlordane toxicity.