Document Report Card

ID: ALA1140203

Journal: J Med Chem

Title: cis-4-(Piperazin-1-yl)-5,6,7a,8,9,10,11,11a-octahydrobenzofuro[2,3-h]quinazolin-2-amine (A-987306), a new histamine H4R antagonist that blocks pain responses against carrageenan-induced hyperalgesia.

Authors: Liu H, Altenbach RJ, Carr TL, Chandran P, Hsieh GC, Lewis LG, Manelli AM, Milicic I, Marsh KC, Miller TR, Strakhova MI, Vortherms TA, Wakefield BD, Wetter JM, Witte DG, Honore P, Esbenshade TA, Brioni JD, Cowart MD.

Abstract: cis-4-(Piperazin-1-yl)-5,6,7a,8,9,10,11,11a-octahydrobenzofuro[2,3-h]quinazolin-2-amine, 4 (A-987306) is a new histamine H(4) antagonist. The compound is potent in H(4) receptor binding assays (rat H(4), K(i) = 3.4 nM, human H(4) K(i) = 5.8 nM) and demonstrated potent functional antagonism in vitro at human, rat, and mouse H(4) receptors in cell-based FLIPR assays. Compound 4 also demonstrated H(4) antagonism in vivo in mice, blocking H(4)-agonist induced scratch responses, and showed anti-inflammatory activity in mice in a peritonitis model. Most interesting was the high potency and efficacy of this compound in blocking pain responses, where it showed an ED(50) of 42 mumol/kg (ip) in a rat post-carrageenan thermal hyperalgesia model of inflammatory pain.

CiteXplore: 18983139

DOI: 10.1021/jm8007618