GSK-2982772

GSK-2982772 is a potent, selective, ATP competitive RIP1 kinase inhibitor with IC50 of 16 nM; inhibits RIP1-dependent inflammatory cytokine MIP-1β production in human whole blood with IC50 of 0.5 nM, reduces spontaneous production of cytokines (IL-1β and IL-6) in a concentration-dependent fashion from ulcerative colitis explant tissue; shows potential for the treatment of inflammatory diseases in vivo.Psoriasis Phase 2 Clinical (In Vitro) :GSK2982772 shows more than 1,000-fold selectivity for ERK5 over a panel of over 339 kinases at 10 μM. In stimulated cellular systems, GSK2982772 is also able to reduce spontaneous production of cytokines (IL-1β and IL-6) in a concentration-dependent fashion from ulcerative colitis explant tissue in overnight incubations. GSK2982772 produces a weak concentration dependent inhibition of hERG in human embryonic kidney (HEK-293) cells, with an estimated IC50 of 195 μM, and also shows a weak activation of the human Pregnane X receptor (hPXR) with an EC50 of 13 μM. (In Vivo) :GSK2982772 is dosed orally 15 min prior to TNF and shows 68, 80, and 87% protection from temperature loss over 6 h, at doses of 3, 10, and 50 mg/kg, respectively. In the corresponding TNF/zVAD model, GSK2982772 shows 13, 63, and 93% protection from temperature loss over 3 h. GSK2982772 displays a good free fraction in blood in rats (4.2%), dogs (11%), cynomolgus monkeys (11%), and humans (7.4%) . The inhibitor has a good pharmacokinetic profile across both rats and monkeys. GSK2982772 distributes into a range of tissues including the colon, liver, kidney, and heart at concentrations comparable to those of blood. However, GSK2982772 has low brain penetration in rat (4%) despite possessing good cell permeability (21x10-6 cm/s) .