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Pro-apoptotic effects of low doses of dimethoate in rat brain.
Toxicology and Applied Pharmacology 2018 November 29
Dimethoate (DMT), a widely used Organophosphorous insecticide, was administered for 5 weeks (sub-chronic) at low dose (15 mg/kg b.w.) to male Wistar rats with the aim to simulate potential exposure to pesticide residues in food and water. The induction of cell death programs was investigated in two brain regions, cortex (Cx) and substantia nigra (SN), after the exposure period. We found that DMT increased cytochrome C (CytC) release from mitochondria, the Bax/Bcl-2 ratio, the activity of caspase-3 and calpains, in both brain regions compared to VEH injected ones. DMT treatment induced oxidative damage of lipids with a consequent enrichment in saturated over unsaturated fatty acids. However, the activity of mitochondrial respiratory complexes was not affected by DMT treatment. The activation of the pro-apoptotic pathway can be correlated with a decrease of TH-immunoreactive neurons in SN, comparable to the reduction observed in this cell population by aging. The results of this work contribute to understand the toxic mechanism of DMT and the possible etiological role that residues of this insecticide, might play in neurodegenerative diseases.
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