Description
ZSTK474 (475110-96-4) is a novel Class I phosphatidylinositol 3-kinase (PI3K) inhibitor. ZSTK474 is an ATP-competitive inhibitor of all four Class I PI3K isoforms. However, it inhibits PI3Kδ most potently, with a Ki of 1.8 nM, while inhibiting the α, β and γ isoforms at slightly higher concentrations (6.7 nM, 10.4 nM and 11.7 nM, respectively)1. Displays potent antitumor activity against human cancer xenografts (A549, PC-3 and WiDr) when administered to mice2. ZSTK474 displays potent anti-inflammatory activity via modulation of human CD14+ monocyte-derived dendritic cell functions and suppresses experimental autoimmune encephalomyelitis3. Ameliorates the progression of adjuvant-induced arthritis in a rat model4.
Uses
ZSTK474 is a triazine derivative that acts as an inhibitor of class I phosphatidylinositol 3-kinase (PI3K) isoforms (IC50s = 17, 53, and 6 nM for p110β, -γ, and -δ, respectively). It is selective for PI3K, as it has negligible activity against 139 other kinases when tested at 30 μM. ZSTK474 is orally bioavailable and shows strong antitumor activity against human cancer xenografts in mice. The efficacy of ZSTK474 against certain cancer cells and tumors can be enhanced by combination therapy.
Definition
ChEBI: A triamino-1,3,5-triazine that is 1,3,5-triazine in which two of the hydrogens have been replaced by morpholin-4-yl groups while the third hydrogen has been replaced by a 2-(difluoromethyl)benzimidazol-1-yl group. It is an inhibitor of phosphatidylinositol
3-kinase.
in vivo
In mice subjected to MCAO, treatment with ZSTK474 is tested at dosages of 50, 100, 200, and 300 mg/kg. Since the 200 mg/kg dose produces significant improvement and no obvious toxic effects (P<0.01), mice are treated with ZSTK474 at a dose of 200 mg/kg/day daily for three post-MCAO days during the remaining experiments of this study. Neurological function is examined in mice suffered from MCAO followed by 24, 48, and 72 h of reperfusion. In the ZSTK474 group, neurological function scores are significantly better than the control group except the corner test[2].
IC 50
PI3Kδ: 4.6 nM (IC50); PI3Kα: 16 nM (IC50); PI3Kβ: 44 nM (IC50); PI3Kγ: 49 nM (IC50); Autophagy
References
1) Kong and Yamori et al. (2007), ZSTK474 is an ATP-competitive inhibitor of class I phosphatidylinositol 3 kinase isoforms; Cancer Sci., 98 1638
2) Yaguchi et al. (2006), Antitumor activity of ZST474, a new phosphatidylinositol 3-kinase inhibitor; J. Natl. Cancer Inst., 98 545
3) Xue et al. (2014), ZSTK474, a novel PI3K inhibitor, modulates human CD14+ monocyte-derived dendritic cell functions and suppresses experimental autoimmune encephalomyelitis; J. Mol. Med. (Berl.), 92 1057
4) Haruta et al. (2012), Inhibitory effects of ZST474, a phosphatidylinositol 3-kinase inhibitor, on adjuvant-induced arthritis in rats; Inflamm. Res., 61 551
