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• W2077894059 abstract "The desensitization characteristics of recombinant human 5-HT(2A), 5-HT(2B), and 5-HT(2C) receptors (VSV and INI isoforms) stably expressed in CHO-K1 (Chinese hamster ovary) cells was investigated by calcium fluorimetry. Comparative desensitization characteristics of the agonists 5-HT, m-chlorophenylpiperazine (mCPP), and 2,5-dimethoxy-4-iodoamphetamine hydrobromide (DOI) were performed. Human 5-HT(2C (INI)) receptors exhibited a greater degree of desensitization to all agonists tested than edited 5-HT(2C (VSV)) receptors. A 2-hr exposure to 5-HT resulted in a significantly larger reduction in response upon re-exposure to 5-HT at 5-HT(2C (INI)) receptors, as compared to 5-HT(2C (VSV)) receptors (72% and 47% respectively, P < 0.01). Both receptor isoforms were expressed at similar densities. Human 5-HT(2B) receptors exhibited the most dramatic degree of desensitization, with prior exposure to 5-HT reducing subsequent response to 5-HT by 80%, with an extremely rapid time-course (t(1/2) < 5 min). The response at 5-HT(2A) receptors was reduced by 54%. The partial agonists mCPP and DOI also elicited desensitization, generally in line with their relative efficacies at each receptor, but exhibited more rapid kinetic profiles than 5-HT. Heterologous desensitization of an endogenously expressed G(q/11)-coupled purinergic receptor was also examined following preincubation of the cell lines with 10 microM 5-HT. Only stimulation of 5-HT(2C (VSV)) receptors resulted in a profound attenuation of subsequent ATP mediated responses. These results demonstrate differing degrees of both homologous and heterologous desensitization of 5-HT(2) receptors. Additionally, the different desensitization profiles of 5-HT(2C (INI)) and 5-HT(2C (VSV)) receptor may be due to signal transduction differences caused by RNA editing." @default.
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• W2077894059 date "2001-08-01" @default.
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• W2077894059 title "Agonist-induced functional desensitization of recombinant human 5-HT2 receptors expressed in CHO-K1 cells22Abbreviations: 5-HT, 5-hydroxytryptamine; CHO, Chinese hamster ovary; PI, phosphoinositide; FLIPR, fluorimetric imaging plate reader; mCPP, m-chlorophenylpiperazine; DOI, 2,5-dimethoxy-4-iodoamphetamine hydrobromide, GPCR, G-protein-coupled receptor; and PCR, polymerase chain reaction." @default.
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• W2077894059 doi "https://doi.org/10.1016/s0006-2952(01)00677-3" @default.
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