Mitogen-activated protein kinases/extracellular signal-regulated kinase (MAPK/ERK) pathway, also known as MEK pathway, is reported to be associated with the cell proliferation, differentiation, migration, senescence and apoptosis[3]. BIX-02188 is a potent MEK5-selective inhibitor with an IC50 of 4.3 nM. BIX02188 inhibits ERK5 catalytic activity, with an IC50 of 810 nM[4]. In activated HeLa cells, BIX-02188 blocks phosphorylation of ERK5, without affecting phosphorylation of ERK1/2, c-Jun amino terminal kinase (JNK) and p38 MAP kinases. Phosphorylated BMK1 (ERK5) is inhibited by BIX-02188 in a dose-dependent manner, with an IC50 of 0.8±1.0 μM, and maximal inhibition at concentrations >3 μM, which confirms the selectivity of BIX-02188 for MEK5-induced BMK1 phosphorylation[5]. When podocytes are pre-incubated in the absence or presence of BIX-02188 (10 μM) for 60 min, Inhibition of Erk5 activation with BIX-02188 incubation reduces podocyte cell number[6].
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