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Drug Chem Toxicol ; 21(1): 35-46, 1998 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-9530529

RESUMO

Lindane is widely used as an insecticide and scabicide in mammals. High doses in chronic exposures caused hyperexcitability and convulsions and impaired motor activity involving GABA-ergic mechanism. To investigate the role of GABA/Benzodiazepine mechanism in the neurotoxicity of low doses of lindane, rats were administered 2, 3, or 5 mg/kg orally for 90 days and behavioural, electrophysiological, and neurochemical studies were conducted. The animals exposed to lindane exhibited increased geotaxis and decreased spontaneous drug-induced locomotor activity (which further potentiated by phenobarbitone and increased after leptazol). The EEG of the treated rats showed high voltage slow-wave activity (HVSA) patterns with occasional spindles (9-10 HZ-amplitude of 100 uv). A significant increase (p < 0.01) in GABA levels in cerebellum and significant increase in benzodiazepine receptors in cerebellar membrane measured by (3H)flunitrazepam binding were observed in the animals exposed to 3 and 5 mg lindane. The study suggests that low dose chronic exposure of lindane causes neurobehavioral, neurochemical, and electrophysiological effects involving GABA-ergic mechanism(s).


Assuntos
Comportamento Animal/efeitos dos fármacos , Encéfalo/efeitos dos fármacos , Hexaclorocicloexano/toxicidade , Inseticidas/toxicidade , Receptores de GABA/efeitos dos fármacos , Animais , Encéfalo/fisiologia , Relação Dose-Resposta a Droga , Eletroencefalografia/efeitos dos fármacos , Masculino , Ratos , Receptores de GABA/análise , Receptores de GABA/fisiologia , Ácido gama-Aminobutírico/análise
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