K252a is a staurosporine analog isolated from Nocardiopsis sp. soil fungi that inhibits protein kinase (PK) C, PKA, Ca2+/calmodulin-dependent kinase type II, and phosphorylase kinase with IC50 values of 470, 140, 270, and 1.7 nM, respectively. Because it inhibits neurotrophin receptor tyrosine kinases, K252a at...

5-Lipoxygenase (5-LO) initiates the synthesis of leukotrienes (LTs) from arachidonic acid, primarily in certain leukocyte populations. CAY10606 is a potent, reversible inhibitor of 5-LO, both in cell-free assays (IC50 = 86 nM) and in intact neutrophils (IC50 = 230 nM). It prevents the production of LTs in whole...