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- W320181966 abstract "Several acetylcholinesterase (AChE) inhibitors decrease muscarinic cholinergic (mACh) receptors in the brain, alteration of dopamine (DA) and ..gamma..-aminobutyric acid (GABA) receptors after AChE inhibition was also reported. In view of the important interactions among DA, GABA and ACh systems, whether this is a common effect of AChE inhibitors should be established. They report the effect of the AChE inhibitor, paraoxon, on DA, GABA and mACh receptors in the rat. The binding of /sup 3/H-QNB (for mACh), /sup 3/H-spiperone (for DA) and /sup 3/H-muscimol (for GABA) to striatal and hippocampal membranes was analyzed. Also, behavioral sensitivity to atropine was studied. Twenty-four hr after a single dose (0.75 mg/kg, s.c.) of paraoxon, the density of mACh receptors in the striatum was decreased but, at 3 days, no change was seen. In the hippocampus, the mACh receptors were not affected. Repeated treatment with paraoxon (0.3 mg/kg, 48 hourly) for 2 weeks reduced the mACh receptor density in both regions. Neither single nor repeated paraoxon treatment had an effect on DA or GABA receptors. After single or repeated dosing with paraoxon, myoclonus induced by atropine (10 mg/kg, i.p.) was enhanced. The results show rapid downregulation of mACh receptors by paraoxon. DA or GABA, however,more » appear not to be affected under these treatment regimens.« less" @default.
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- W320181966 date "1986-03-05" @default.
- W320181966 modified "2023-09-24" @default.
- W320181966 title "Effect of paraoxon on muscarinic, dopamine and. gamma. -aminobutyric acid receptors of brain and sensitivity to muscarinic antagonists" @default.
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