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- W2259378750 abstract "Cholinesterase (ChE) activity in tissues from carbamate-treated animals is especially difficult to analyze because the inhibited ChE tends to decarbamylate, leading to an underestimation of ChE inhibition. Given this instability during analysis, reactivation of the carbamylated ChE may occur during storage. The present study was designed to investigate the degree of reactivation of ChE in plasma and brain tissue taken from carbamate-treated animals. Plasma and brain were taken from carbaryl-treated (50 mg/kg, po) male, Long-Evans rats and stored at either 20 or 80 C and analyzed for ChE activity after 31, 46, and 138 days of storage. A control group of tissues was taken from rats treated (20 mg/kg, po) with chlorpyrifos (considered a stable inhibitor of ChE; not pronetoreactivation)and handled and analyzed in exactly the samemanner. Plasma ChE activity from carbaryl- or chlorpyrifos-treated animals remained stable when stored at 80 C; in the 20 C storage condition, the chlorpyrifosinhibited plasma ChE levels also remained stable, but the carbaryl-inhibited plasma ChE levels increased sharply. Brain tissue was stored as either a homogenate (one half of brain) or as intact tissue (other half of brain). The stability of brain homogenate ChE from carbaryl-treated animals was similar to that of carbaryl-inhibited plasma ChE; it was constant at 80 C, but reactivation occurred when the brain was stored at 20 C (though the degree of reactivation of ChE was less in brain).Interestingly,chlorpyrifos-inhibited brain homogenate ChE reactivated whether stored at 80 or 20 C. Intact brain tissue from animals treated with either carbaryl or chlorpyrifos showed no reactivation even if kept for up to 207 days at 80 C. In conclusion, tissues taken from antiChEtreated animals should be stored at 80 C (20 C is inappropriate) and brain samples should be stored as intact tissue." @default.
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- W2259378750 date "1999-01-01" @default.
- W2259378750 modified "2023-10-02" @default.
- W2259378750 title "INFLUENCE OF STORAGE CONDITIONS ON THE STABILITY OF CHOLINESTERASE ACTIVITY IN PLASMA AND BRAIN TISSUE TAKEN FROM CARBAMATE OR ORGANOPHOSPHORUS PESTICIDE-TREATED RATS" @default.
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- W2259378750 doi "https://doi.org/10.1080/105172399242690" @default.
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