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• W2103462666 abstract "Mutant 5-hydroxytryptamine (5-HT)3A receptors, in which changes were made at Ile294, position 16', of the second transmembrane domain, were assessed for alterations in macroscopic response kinetics and modulation by alcohols. Function of heterologously expressed receptors was measured in Xenopus oocytes in the two-electrode voltage clamp configuration and in human embryonic kidney 293 cells using whole cell patch-clamp electrophysiological recordings with rapid drug application. Compared with the wild-type receptor, a decrease in the 5-HT EC50 value in the Ile294Thr mutant was observed, whereas an increase in the 5-HT EC50 value in the Ile294Leu mutant was measured. Ile294Thr receptors showed a marked reduction in the extent of desensitization. Ethanol and 2,2,2-trichloroethanol (TCEt) enhanced 5-HT-mediated currents in wild-type and Ile294Leu receptors, but inhibited or had little stimulatory effect in the Ile294Thr mutant. Kinetic analysis revealed that in the presence of TCEt, the slope of activation was unchanged in the Ile294Thr mutant and increased in the wild-type receptor. Alcohol cutoff was altered with wild-type = heptanol and Ile294Leu = hexanol. Kinetic changes in the Ile294Thr mutant that favor the open channel state, as well as reduction in the rate of channel activation in the presence of TCEt, likely underlie this mutant's altered response to n-chain alcohols." @default.
• W2103462666 created "2016-06-24" @default.
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• W2103462666 date "2003-05-02" @default.
• W2103462666 modified "2023-09-26" @default.
• W2103462666 title "A Mutation in Transmembrane Domain II of the 5-Hydroxytryptamine3A Receptor Stabilizes Channel Opening and Alters Alcohol Modulatory Actions" @default.
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• W2103462666 doi "https://doi.org/10.1124/jpet.103.050542" @default.
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