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Izencitinib (TD-1473) is an orally active, non-selective and gut-restricted JAK inhibitor. Izencitinib (TD-1473) can be used in the study for ulcerative colitis[1].

Izencitinib (TD-1473) inhibits cytokine-evoked STAT phosphorylation in human peripheral blood mononuclear cells (PBMCs) and in a human colonic epithelial cell line (pIC50 ≥ 6.7)[1].Izencitinib (TD-1473) is a potent JAK1, JAK2, JAK3, and TYK2 inhibitor at the human JAK kinase domains (pKi values of 10.0, 10.0, 8.8, and 9.5, respectively)[1].

Izencitinib (TD-1473, 1 mg/kg BID) preserves body weight and reduced occult blood scores in a mouse oxazolone colitis model[1].

[1]. Kevin S Currie, et al. Small-molecule agents for the treatment of inflammatory bowel disease. Bioorg Med Chem Lett. 2019 Aug 15;29(16):2034-2041.

[2]. William J Sandborn, et al. Development of Gut-Selective Pan-Janus Kinase Inhibitor TD-1473 for Ulcerative Colitis: A Translational Medicine Programme. J Crohns Colitis. 2020 Sep 16;14(9):1202-1213.

[3]. D. Beattie, et al. TD-1473, a novel, potent, and orally administered, GI-targeted, pan-Janus kinase (JAK) inhibitor. Journal of Crohn’s and Colitis, Volume 10, Issue suppl_1, March 2016, Page S123.

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