Effects of impromidine- and arpromidine-derived guanidines on recombinant human and guinea pig histamine H1 and H2 receptors

Sheng Xue Xie, Fabian Schalkhausser, Qi Zhuang Ye, Roland Seifert, Armin Buschauer

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Imidazolylpropylguanidines derived from impromidine and arpromidine are more potent and efficacious agonists at the guinea pig histamine H2 receptor (gpH2R) than at the human H2R (hH2R) in the GTPase assay. Additionally, such guanidines are histamine H1 receptor (H1R) antagonists with preference for the human relative to the guinea pig receptor. The purpose of this study was to examine structure-activity relationships of guanidines at human and guinea pig H 1R and H2R species isoforms expressed in Sf9 insect cells. Three impromidine analogues and six arpromidine analogues exhibited agonistic activity at H2R and antagonistic activity at H1R as assessed in the steady-state GTPase assay. Species selectivity of derivatives was similar as compared with the parent compounds. None of the structural modifications examined (different aromatic ring systems and different ring substituents) was superior in terms of H2R potency and efficacy relative to impromidine and arpromidine, respectively. These data point to substantial structural constraints at the agonist binding site of H 2R. Guanidines exhibited distinct structure-activity relationships for H1R antagonism in a radioligand competition binding assay and the GTPase assay and for H1R inverse agonism. Our data indicate that it is difficult to obtain guanidine-type agonists with high potency and high efficacy for hH2R, but those compounds may be useful tools for exploring the antagonist binding site and constitutive activity of H 1R.

Original languageEnglish (US)
Pages (from-to)9-16
Number of pages8
JournalArchiv der Pharmazie
Volume340
Issue number1
DOIs
StatePublished - Jan 1 2007

Keywords

  • Arpromidine
  • Guanidines
  • Histamine H receptor
  • Histamine H receptor
  • Impromidine

ASJC Scopus subject areas

  • Drug Discovery
  • Organic Chemistry
  • Chemistry(all)
  • Pharmacology

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