title: Molecular and cellular analysis of human histamine receptor subtypes.
abstract: The human histamine receptors hH(1)R and hH(2)R constitute important drug targets, and hH(3)R and hH(4)R have substantial potential in this area. Considering the species-specificity of pharmacology of H(x)R orthologs, it is important to analyze hH(x)Rs. Here, we summarize current knowledge of hH(x)Rs endogenously expressed in human cells and hH(x)Rs recombinantly expressed in mammalian and insect cells. We present the advantages and disadvantages of the various systems. We also discuss problems associated with the use of hH(x)R antibodies, an issue of general relevance for G-protein-coupled receptors (GPCRs). There is much greater overlap in activity of 'selective' ligands for other hH(x)Rs than the cognate receptor subtype than generally appreciated. Studies with native and recombinant systems support the concept of ligand-specific receptor conformations, encompassing agonists and antagonists. It is emerging that for characterization of hH(x)R ligands, one cannot rely on a single test system and a single parameter. Rather, multiple systems and parameters have to be studied. Although such studies are time-consuming and expensive, ultimately, they will increase drug safety and efficacy.
authors.affiliation: Institute of Pharmacology, Medical School of Hannover, Hannover, Germany. seifert.roland@mh-hannover.de
authors.forename: Roland
authors.initials: R
authors.lastname: Seifert
authors.forename: Andrea
authors.initials: A
authors.lastname: Strasser
authors.forename: Erich H
authors.initials: EH
authors.lastname: Schneider
authors.forename: Detlef
authors.initials: D
authors.lastname: Neumann
authors.forename: Stefan
authors.initials: S
authors.lastname: Dove
authors.forename: Armin
authors.initials: A
authors.lastname: Buschauer
mesh_terms: D000818:Animals; D017442:Histamine Agonists / Q000737:chemistry / Q000494:pharmacology; D006633:Histamine Antagonists / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D058990:Molecular Targeted Therapy; D011968:Receptors, Histamine / Q000737:chemistry* / Q000145:classification* / Q000235:genetics / Q000378:metabolism
chemical_list: D017442:Histamine Agonists; D006633:Histamine Antagonists; D011968:Receptors, Histamine