Author: Yao, Wenqing ; He, Xin ; Bowman, Kevin ; Feldman, Patricia ; Newton, Robert ; Li, Yanlong ; Czerniak, Philip ; Wang, Kathy He ; Zhang, Jing ; Bian, Di ; Krug, Kristin ; Hu, Zhijing ; Soloviev, Maxim ; Zhuo, Jincong ; Qian, Ding-Quan ; Leffet, Lynn ; Scherle, Peggy ; Zhao, Hui ; Covington, Maryanne ; Shin, Niu ; Bell, Dan ; Yeleswaram, Swamy

The histamine H₄ receptor mediates several histamine-induced cellular functions of leukocytes, including cell migration and cytokine production. Recent studies suggest that histamine signaling through the histamine H₄ receptor can also have anti-pruritic and anti-nociceptive functions. 1-(7-(2-amino-6-(4-methylpiperazin-1-yl) pyrimidin-4-yl)-3, 4-dihdroisoquinolin-2(1H)-yl)-2-cyclopentylethanone (INCB38579) is a novel small molecule antagonist of the human and rodent histamine H₄ receptors with at least 80-fold selectivity over the human histamine H₁, H₂ and H₃ receptors, and has good pharmacokinetic properties in rats and mice. The compound is potent in inhibiting histamine binding to and signaling through the recombinant human, mouse and rat histamine H₄ receptors and blocks the histamine-induced migration of human and mouse dendritic cells, as well as the cell shape change and migration of human eosinophils. INCB38579 and histamine may have separate but overlapping binding sites on the human histamine H₄ receptor. This novel inhibitor is efficacious when evaluated in two previously established in vivo models for histamine H₄ receptor activity (histamine-induced itch in mice and carrageenan-induced acute inflammatory pain in rats). When examined in formalin-induced pain models, INCB38579 significantly reduces the sustained inflammatory pain experienced by rats and mice. A good correlation between the protein binding adjusted potency from in vitro studies and its analgesic effect in vivo was observed. These results suggest that INCB38579 can serve as a useful tool for pharmacologic characterization of the histamine H₄ receptor and further support the hypothesis that targeting the histamine H₄ receptor may provide new therapeutic agents for various chronic inflammatory diseases, including inflammatory pain.

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Indication	Highest Phase	Country/Location	Organization	Date
Inflammatory pain	Preclinical	US	Incyte Corp.	27 Nov 2011
Pruritus	Preclinical	US	Incyte Corp.	27 Nov 2011

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