Zusammenfassung
In the present study we searched for neutral antagonists for the human histamine H-1-receptor (H,R) by screening newly synthesized ligands that are structurally related to H1R agonists for their affinity using radioligand displacement studies and by assessing their functional activity via performing a NF-kappaB driven reporter-gene assay that allows for the detection of both agonistic and inverse ...
Zusammenfassung
In the present study we searched for neutral antagonists for the human histamine H-1-receptor (H,R) by screening newly synthesized ligands that are structurally related to H1R agonists for their affinity using radioligand displacement studies and by assessing their functional activity via performing a NF-kappaB driven reporter-gene assay that allows for the detection of both agonistic and inverse agonistic responses. Starting from the endogenous agonist for the H1R, histamine, we synthesized and tested various analogues and ultimately identified several compounds with partial inverse agonistic properties and two neutral Hi-receptor antagonists, namely 2-[2-(4,4diphenylbutyl)-1H-imidazol-4-yl]ethylamine (histabudifen, 18d) (pK(i) = 5.8, alpha = 0.02) and 2-[2-(5,5-diphenylpentyl)-1H-imidazol-4-yl]ethylamine (histapendifen, 18e) (pK(i) = 5.9, alpha = -0.09).
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