Description_x000D_ Application_x000D_ GSK-J4 has been used to study the effect of KDM2B (Jumonji (JmjC) domain histone 3 lysine 36 (H3K36) di-demethylase) inhibition on the survival and DNA repair potential of glioblastoma cells. It has also been used in sulforhodamine B (SRB) cell growth assay and cell viability assay._x000D_ Packaging_x000D_ 5, 25 mg in glass bottle_x000D_ Biochem/physiol Actions_x000D_ GSK-J4 is cell permeable prodrug rapidly hydrolysed by macrophage esterases to GSK-J1, a potent selective jumonji H3K27 demethylase inhibitor. Jumonji C domain-containing histone demethylases (JHDMs) are Fe(II) and α-ketoglutarate dependent enzymes that oxygenate methylated histone lysine residues and thereby cause their demethylation. GSK-J1 is selective for the KDM6 subfamily members JMJD3 and UTX with an IC50 of 60 nM in a JMJD3 assay, and is inactive against other demethylases of the JMJ family and over 100 tested kinases and histone deacetylases. The prodrug GSK-J4 inhibited TNF-α production with an IC50 of 9 μM in LPS-stimulated human macrophages and blocked the production of TNF-α by macrophages derived from patients with rheumatoid arthritis. For characterization details for GSK-J4 and full characterization details for GSK-J1, please visit the GSK-J1 probe summary on the Structural Genomics Consortium (SGC) website._x000D_ To learn about other SGC chemical probes for epigenetic targets, visit sigma.com/sgc_x000D_ Features and Benefits_x000D_ GSK-J4 is an epigenetic chemical probe available through a partnership with the Structural Genomics Consortium (SGC). To learn more and view other SGC epigenetic probes, visit sigma.com/SGC._x000D_ This compound is a featured product for Gene Regulation research. Click here to discover more featured Gene Regulation products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm._x000D_ Other Notes_x000D_ GSK-J4 has been expertly reviewed and recommended by the Chemical Probes Portal. For more information, please visit the GSK-J4 probe summary on the Chemical Probes Portal website.