GSK2982772

GSK2982772 is a potent, orally active and ATP competitive RIP1 kinase inhibitor with IC₅₀ values of 16 nM and 20 nM for human and monkey RIP1, respectively^[1]. IC50 & Target: IC50: 16 nM (human RIP1 FP)
IC50: 20 nM (monkey RIP1 FP)
IC50: 2 μM (rat RIP1 FP)
IC50: 2.5 μM (mouse RIP1 FP)^[1] 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^[1]. 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 (21×10^-6 cm/s)^[1].