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• W2091452162 endingPage "116" @default.
• W2091452162 startingPage "110" @default.
• W2091452162 abstract "Organophosphates (OPs) and carbamates are widely used insecticides that exert their neurotoxicity via inhibition of acetylcholine esterase (AChE) and subsequent overexcitation. OPs can induce additional neurotoxic effects at concentrations below those for inhibition of AChE, indicating other mechanisms of action are also involved. Since tight regulation of the intracellular calcium concentration ([Ca2+]i) is essential for proper neuronal development and function, effects of one carbamate (carbaryl) and two OPs (chlorpyrifos, parathion-ethyl) as well as their -oxon metabolites on [Ca2+]i were investigated. Effects of acute (20 min) exposure to (mixtures of) insecticides on basal and depolarization-evoked [Ca2+]i were measured in fura-2-loaded PC12 cells using single-cell fluorescence microscopy. Acute exposure to chlorpyrifos and its metabolite chlorpyrifos-oxon (10 μM) induced a modest increase in basal [Ca2+]i. More importantly, the tested OPs concentration-dependently inhibited depolarization-evoked [Ca2+]i. Chlorpyrifos already induced a ∼30% inhibition at 0.1 μM and a 100% inhibition at 10 μM (IC50 = 0.43 μM), whereas parathion-ethyl inhibited the depolarization-evoked [Ca2+]i increase with ∼70% at 10 μM. Interestingly, -oxon metabolites were more potent inhibitors of AChE, but were less potent inhibitors of depolarization-evoked [Ca2+]i compared to their parent compound (chlorpyrifos-oxon) or were even without effect (paraoxon-ethyl and -methyl). Similarly, acute exposure to carbaryl had no effect on [Ca2+]i. Exposure to mixtures of chlorpyrifos with its oxon-analog or with parathion-ethyl did not increase the degree of inhibition, indicating additivity does not apply. These data demonstrate that concentration-dependent inhibition of depolarization-evoked [Ca2+]i is a novel mechanism of action of (sub)micromolar concentrations of OPs that could partly underlie OP-induced neurotoxicity." @default.
• W2091452162 created "2016-06-24" @default.
• W2091452162 creator A5043321849 @default.
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• W2091452162 date "2014-07-01" @default.
• W2091452162 modified "2023-10-04" @default.
• W2091452162 title "Acute disturbance of calcium homeostasis in PC12 cells as a novel mechanism of action for (sub)micromolar concentrations of organophosphate insecticides" @default.
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• W2091452162 doi "https://doi.org/10.1016/j.neuro.2014.01.008" @default.
• W2091452162 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24495583" @default.
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