Fragment based design of new H4 receptor-ligands with anti-inflammatory properties in vivo

J Med Chem. 2008 Apr 24;51(8):2457-67. doi: 10.1021/jm7014217. Epub 2008 Mar 22.


Using a previously reported flexible alignment model we have designed, synthesized, and evaluated a series of compounds at the human histamine H 4 receptor (H 4R) from which 2-(4-methyl-piperazin-1-yl)-quinoxaline ( 3) was identified as a new lead structure for H 4R ligands. Exploration of the structure-activity relationship (SAR) of this scaffold led to the identification of 6,7-dichloro 3-(4-methylpiperazin-1-yl)quinoxalin-2(1 H)-one (VUF 10214, 57) and 2-benzyl-3-(4-methyl-piperazin-1-yl)quinoxaline (VUF 10148, 20) as potent H 4R ligands with nanomolar affinities. In vivo studies in the rat reveal that compound 57 has significant anti-inflammatory properties in the carrageenan-induced paw-edema model.

MeSH terms

  • Anti-Inflammatory Agents / chemistry
  • Anti-Inflammatory Agents / pharmacology*
  • Drug Design*
  • Humans
  • Ligands
  • Magnetic Resonance Spectroscopy
  • Models, Molecular
  • Receptors, Histamine / drug effects*
  • Receptors, Histamine / metabolism
  • Spectrometry, Mass, Electrospray Ionization
  • Structure-Activity Relationship


  • Anti-Inflammatory Agents
  • Ligands
  • Receptors, Histamine