Synthesis and Pharmacological Identification of Neutral Histamine H<sub>1</sub>-Receptor Antagonists
作者:Marinella Govoni、Remko A. Bakker、Ineke van de Wetering、Martine J. Smit、Wiro M. B. P. Menge、Henk Timmerman、Sigurd Elz、Walter Schunack、Rob Leurs
DOI:10.1021/jm030936t
日期:2003.12.1
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).