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• W1970686193 abstract "Strychnine, a potent and selective antagonist at glycine receptors, was found to inhibit muscle (α 1 β 1 γδ, α 1 β 1 γ, and α 1 β 1 δ) and neuronal (α 2 β 2 and α 2 β 4 ) nicotinic acetylcholine receptors (AcChoRs) expressed in Xenopus oocytes. Strychnine alone (up to 500 μM) did not elicit membrane currents in oocytes expressing AcChoRs, but, when applied before, concomitantly, or during superfusion of acetylcholine (AcCho), it rapidly and reversibly inhibited the current elicited by AcCho (AcCho-current). Although in the three cases the AcCho-current was reduced to the same level, its recovery was slower when the oocytes were preincubated with strychnine. The amount of AcCho-current inhibition depended on the receptor subtype, and the order of blocking potency by strychnine was α 1 β 1 γδ > α 2 β 4 > α 2 β 2 . With the three forms of drug application, the Hill coefficient was close to one, suggesting a single site for the receptor interaction with strychnine, and this interaction appears to be noncompetitive. The inhibitory effects on muscle AcChoRs were voltage-independent, and the apparent dissociation constant for AcCho was not appreciably changed by strychnine. In contrast, the inhibitory effects on neuronal AcChoRs were voltage-dependent, with an electrical distance of ≈0.35. We conclude that strychnine regulates reversibly and noncompetitively the embryonic type of muscle AcChoR and some forms of neuronal AcChoRs. In the former case, strychnine presumably inhibits allosterically the receptor by binding at an external domain whereas, in the latter case, it blocks the open receptor-channel complex." @default.
• W1970686193 created "2016-06-24" @default.
• W1970686193 creator A5035781296 @default.
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• W1970686193 date "1999-03-30" @default.
• W1970686193 modified "2023-10-18" @default.
• W1970686193 title "Modulation of nicotinic acetylcholine receptors by strychnine" @default.
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• W1970686193 doi "https://doi.org/10.1073/pnas.96.7.4113" @default.
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