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- W2090860006 abstract "Rats receiving the chlorinated insecticide, chlordecone (80 mg/kg i.p.), exhibit hyperexcitability, exaggerated startle response and tremors within a few hours after the injection. Since the chlordecone-elicited tremors are relieved by injections of muscarinic receptor blockers, acetylcholine has been implicated indirectly in the mechanism of chlordecone toxicity. Our studies on acetylcholine steady-state levels and turnover in several brain structures failed to detect evidence for an involvement of cholinergic presynaptic mechanisms in the chlordecone toxicity. We then investigated whether GABA is involved by measuring the rate of its accumulation following intraventricular injection of gabaculine. Chlordecone reduced the rate of GABA accumulation in striatum, but not in cerebellum, brainstem or hippocampus. Such inhibition appeared 4 h after drug injection thereby preceding the onset of tremors. Since tremors elicited by chlordecone are attenuated by the administration of serotonin receptor blockers and since chlordecone increases serotonin (5-HT) turnover, we studied whether 5-HT recognition sites are modified following chlordecone administration. We have found a reduction of the Bmax of 5-HT1 receptors in striatum and hippocampus without any modification in the kinetic characteristics of 5-HT2 receptors. We have also shown that the temporal relationship between down regulation of 5-HT1 recognition sites, reduction of striatal GABA turnover and tremors caused by chlordecone allows one to consider these 3 phenomena as reciprocally dependent. In conclusion our results favor the possibility that tremors may result from a decrease in the striatal GABergic tone which probably is elicited by an increase of serotonergic activity caused by chlordecone by a yet unknown mechanism." @default.
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- W2090860006 date "1984-06-01" @default.
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- W2090860006 title "On the neurotoxicity of chlordecone: A role for γ-aminobutyric acid and serotonin" @default.
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- W2090860006 doi "https://doi.org/10.1016/0006-8993(84)90218-x" @default.
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