Oclacitinib is a novel inhibitor of JAK family members with IC50 ranging from 10 to 99 nM and JAK1-dependent cytokines with IC50 ranging from 36 to 249 nM, which did not inhibit a panel of 38 non-JAK kinases. PF-03394197 is most potent at inhibiting JAK1. PF-03394197 also inhibits the function of JAK1-dependent cytokines involved in allergy and inflammation as well as pruritus. PF-03394197 has minimal effects on cytokines which does not activate the JAK1 enzyme in cells
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