Noriega-Ortega BR, Armienta-Aldana E, Cervantes-Pompa JÁ, Armienta-Aldana E, Hernández-Ruíz E, Chaparro-Huerta V, Bravo-Cuellar A, Beas-Zárate C. GABA and Dopamine Release from Different Brain Regions in Mice with Chronic Exposure to Organophosphate Methamidophos.
J Toxicol Pathol 2011;
24:163-8. [PMID:
22272056 PMCID:
PMC3234592 DOI:
10.1293/tox.24.163]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 05/16/2011] [Indexed: 12/03/2022] Open
Abstract
Organophosphates such as methamidophos, usually used in the agricultural field, have
harmful effects on humans. Exposures to insecticides has been associated with many
disorders, including damage to the central and peripheral nervous system. Chronic exposure
to organophosphates may lead to persistent neurological and neurobehavioral effects. This
study was conducted to determine the effect of methamidophos on [3H]-dopamine
(DA) and gamma aminobutyric acid (GABA) release from different brain regions after chronic
exposure to it for 3, 6 or 9 months. After a six-month methamidophos treatment, the mice
showed high susceptibility to convulsive seizures and a reduction in stimulated gamma
aminobutyric acid release from the cerebral cortex and hippocampal slices, whereas
stimulated (DA) release was slightly decreased from the striatum after three months of
methamidophos exposure. The results indicate changes in gamma aminobutyric acid and
dopamine neurotransmission, suggesting a specific neuronal damage.
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