ON 146040

• CAT Number: I001551
• CAS Number: 1404231-34-0
• Molecular Formula: C24H23N7O3S
• Molecular Weight: 489.55
• Purity: ≥95%
• Synonyms: (7Z)-2-[4-(4-methylpiperazin-1-yl)anilino]-7-[(4-nitrophenyl)methylidene]-5H-pyrimido[4,5-b][1,4]thiazin-6-one
• InChI: InChI=1S/C24H23N7O3S/c1-29-10-12-30(13-11-29)18-8-4-17(5-9-18)26-24-25-15-20-23(28-24)35-21(22(32)27-20)14-16-2-6-19(7-3-16)31(33)34/h2-9,14-15H,10-13H2,1H3,(H,27,32)(H,25,26,28)/b21-14-
• InChIKey: PKCHFYZACODWAI-STZFKDTASA-N
• SMILES: CN1CCN(CC1)C2=CC=C(C=C2)NC3=NC=C4C(=N3)SC(=CC5=CC=C(C=C5)[N+](=O)[O-])C(=O)N4

ON 146040 is a potent PI3Kα and PI3Kδ (IC50≈14 and 20 nM, respectively) inhibitor. ON 146040 also inhibits Abl1 (IC50<150 nM).
In biochemical testing, ON 146040 inhibits PI3Kα/ PI3Kδ isoforms (IC50≈14 and 20 nM, respectively) without having a major effect on PI3Kβ/ PI3Kγ isoforms (IC50≈3 and 1 μM, respectively). ON 146040 is also found to inhibit Abl1 and several mutant versions of this kinase (IC50<150 nM), although ON 146040 is not found to be active against the T315I mutant. ON 146040 represents the first dual PI3K and BCR-ABL inhibitor that targets the STAT3 and STAT5 pathways. ON 146040 disrupts the oncogenic activity of both STAT3 and STAT5 by targeting upstream activators, including PI3K α and δ isoforms as well as wild type and mutant BCR-ABL. ON 146040 is highly potent in killing hematologic tumor cells with IC50 values in the 150 to 1,000 nM range. Following treatment with ON 146040, STAT3 and STAT5 phosphorylation are down-regulated in leukemia and myeloma cells[1].

Reference

[1]. Targeting oncogenic STAT3 and STAT5 signaling with on 146040, a small molecule inhibitor of PI3K α/δ and BCR-ABL.