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• W1990168373 abstract "On the basis of the previously demonstrated constitutive activity in natural systems and the possibility of specific ligand-induced conformations, the aims of this study were: (i) to characterize the effects of two competitive antagonists (rauwolscine, RAU and clozapine, CLO) with very similar potencies for 5-HT(2B) receptors in a natural system (rat stomach fundus), and (ii) to evaluate a new method for detecting ligand-specific generated conformations through the study of the effects of RAU and CLO in 5-HT efficacy and in the time course of the response to the agonists. RAU and CLO behaved as competitive antagonists and showed similar potencies (pA(2) 7.56+/-0.25 and 7.50+/-0.30, respectively). However, RAU displayed greater efficacy than CLO in relaxing basal tension (10 microM CLO represented 64+/-6% of 10 microM RAU-induced relaxation). CLO partially reverted RAU-induced relaxation and RAU promoted an additional relaxation of maximal CLO-induced relaxation. This may indicate different degrees of inverse agonism. RAU also was more effective in generating insurmountable antagonism after long-term incubation (>3 hr) and modified the time course of the 5-HT(2B) response to 5-HT; conversely, CLO did not affect the time course of this response. This suggests that classical competitive antagonists may generate different specific conformational states and differential effects on receptor system regulation." @default.
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• W1990168373 date "2003-09-01" @default.
• W1990168373 modified "2023-09-27" @default.
• W1990168373 title "Different pharmacological properties of two equipotent antagonists (Clozapine and Rauwolscine) for 5-HT2B receptors in rat stomach fundus" @default.
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• W1990168373 doi "https://doi.org/10.1016/s0006-2952(03)00426-x" @default.
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