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• W2000504940 abstract "Constitutive activity of the recombinant and native rat and human H(3) receptors (H(3)Rs) was studied using H(3)R-mediated [(35)S]GTPgamma[S] binding and [(3)H]-arachidonic acid release. Ciproxifan, an inverse agonist at the rat H(3)R (rH(3)R), decreased [(3)H]arachidonic acid release from CHO cells expressing moderate densities (approximately 200 - 300 fmol mg(-1) protein) of the human H(3)R (hH(3)R). This effect occurred with the same magnitude than at the rH(3)R. The expression of the hH(3)R was associated with an increase in [(35)S]GTPgamma[S] binding to membranes of CHO cells. Ciproxifan decreased [(35)S]GTPgamma[S] binding to membranes of CHO (hH(3)R) cells. Both effects were correlated to receptor density and revealed that constitutive activity of the hH(3)R, although lower than that of the rH(3)R in this assay, was again observed at physiological densities (<500 fmol mg(-1) protein). Ciproxifan was less potent at the human than the rat receptor, not only as an antagonist (K(i)=45 nM), but also as an inverse agonist (EC(50)=15 nM). Constitutive activity of the hH(3)R was also evidenced using inhibition of [(35)S]GTPgamma[S] binding by unlabelled GTPgammaS. The expression of the hH(3)R generated a high affinity binding for GTPgammaS which was increased by imetit, but partially decreased by ciproxifan, therefore acting as a partial inverse agonist. [(35)S]GTPgamma[S] binding to rat brain membranes was decreased in several regions by thioperamide, ciproxifan and FUB 465, three inverse agonists at the H(3)R, whose effects were blocked by proxyfan, a neutral antagonist. [(35)S]GTPgamma[S] binding was also decreased by an A(1)-adenosine receptor inverse agonist, but remained unchanged in the presence of inverse agonists at D(2)/D(3) dopamine, H(1) and H(2) histamine, alpha(2)-adrenergic and delta opioid receptors. In conclusion, the present study shows that the recombinant rat and human H(3) receptors expressed at physiological densities display constitutive activity and suggests that constitutive activity of native H(3)Rs is one of the highest among G-protein-coupled receptors present in rat brain." @default.
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• W2000504940 date "2002-01-01" @default.
• W2000504940 modified "2023-10-12" @default.
• W2000504940 title "Histamine H₃-receptor-mediated [³⁵S]GTPγ[S] binding: evidence for constitutive activity of the recombinant and native rat and human H₃receptors" @default.
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• W2000504940 doi "https://doi.org/10.1038/sj.bjp.0704490" @default.
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