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GSK J4 is a potent cell-permeable inhibitor of the histone H3 lysine 27 (H3K27) demethylase JMJD3, an essential component of regulatory transcriptional chromatin complexes, with the half maximal inhibition concentration IC50 value > 50 μM in vitro [1].

GSK J4 is an ethyl ester derivative of GSK J1, which is a potent JMJD3 inhibitor (IC50: 60 nM) with restricted cellular permeability due to the highly polar carboxylate group, and rapidly hydrolyzed by macrophage esterase upon administration leading to the generation of pharmacologically relevant intracellular concentration of GSK-J1 [1].

GSK J4 has also been found to dose-dependently inhibit the production of tumor-necrosis factor-α (TNF-α), a LPS-driven cytokine involved in various fnflammatory disorders, with IC50 value of 9μM [1].

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