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- W2077902145 abstract "Repeated exposures to anti-cholinesterase compounds induce profound enzyme inhibition and consequent neurotransmitter perturbations. When the result of exposure is an accumulation of neurotransmitter, as it is in the case of exposure to soman, target receptors may respond by compensating for the imbalance by regulating either their number or binding affinity. Recovery of function may further include alterations in receptor systems not themselves a direct target of the toxic compound. Rats were injected with soman (50 μg/kg, sc) three times weekly for 4 weeks and decapitated at intervals ranging from 1 hr to 6 days after the final injection. Synaptic membranes were prepared from hippocampus (HIP), striatum (STR), and cortex (COR) and kinetics of muscarinic cholinergic and GABAergic binding were assessed using [3H]QNB and [3H]muscimol, respectively, as ligands. Soman induced large and persistent decreases in the number of muscarinic receptors in HIP and COR with the surviving receptors being of higher affinity. The number of high affinity GABA receptors decreased in all three regions but returned to near baseline within 3 days after the final soman exposure. These effects are due either to a direct action of soman on the receptors, or a diaschitic response of the receptors to cholinergic excess. Muscarinic cholinergic receptors exhibit a persistent down regulation, and GABA receptors a transient response, to soman administration." @default.
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- W2077902145 date "1985-12-01" @default.
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- W2077902145 title "Soman intoxication alters regional brain muscarinic and GABA receptors" @default.
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- W2077902145 doi "https://doi.org/10.1016/0048-3575(85)90147-6" @default.
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