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- W2019813322 abstract "The cholinergic system of the brain was investigated in rats acutely poisoned with the organophosphate, 0,0-dimethyl 0-(2,2-dichlorovinyl) phosphate (DDVP), (6 mg/kg, sc, with saline as a control). The amounts of three fractions of acetylcholine (ACh)—free (extraterminal), labile-bound (intraterminal/cytoplasmic), and stable-bound (intraterminal/vesicular)—increased in the rats over a period of 5 to 60 min after injection of DDVP, showing peaks which were 2.45, 1.82, and 1.4 times as high as the respective control amounts. No difference was seen in the amount of any fraction of ACh between treated and control rats killed 3 and 24 hr after injection. Acetylcholinesterase (AChE) activity decreased to between 12 and 43% of the control over a period of 5 to 180 min and recovered almost completely within 24 hr after injection. No appreciable changes were seen in either spontaneous or potassium-induced ACh release in brain tissue slices obtained from rats treated with DDVP. ACh synthesis in slices was suppressed significantly 20 min, but not 24 hr, after injection of DDVP. In the brain crude synaptosomal preparation, high-affinity choline uptake, which is generally thought to be a rate-limiting step for ACh synthesis, was suppressed 20 min after DDVP. No appreciable changes were seen in high-affinity choline uptake at 24 hr low-affinity choline uptake, and choline acetyltransferase activity after injection of DDVP. These results suggest that ACh synthesis and high-affinity choline uptake may be in a suppressed state when ACh concentration, especially intraterminal ACh, is increased and AChE activity is decreased in the brain cholinergic system of rats poisoned with DDVP. The increase in the intratermianl ACh may be due to an inhibition of AChE activity at this site and/or a re-uptake of ACh in the synaptic cleft, not to an inhibition of ACh release or an increase in ACh synthesis." @default.
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- W2019813322 date "1986-01-01" @default.
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- W2019813322 title "Cholinergic system of brain tissue in rats poisoned with the organophosphate, 0,0-dimethyl 0-(2,2-dichlorovinyl) phosphate" @default.
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- W2019813322 doi "https://doi.org/10.1016/0041-008x(86)90434-5" @default.
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