PIK-75是一种p110α抑制剂，IC50为5.8 nM (比作用于p110β效果强200倍)，亚型特异性的突变体在Ser773，也有效抑制DNA-PK，IC50为2 nM。与纯化的p110α结合, PIK-75是非竞争性抑制剂，K_i 为 36 nM。PIK-75也有效抑制DNA-PK，IC50为2 nM。 PIK-75 (1 μM) 通过显著降低无刺激的非哮喘气道平滑肌细胞（ASM），哮喘 ASM细胞 , 和肺成纤维细胞的线粒体活性，降低细胞寿命。

>98%

Store at -20℃ for one year（Powder）；Store at 2-4℃ for two weeks；Store at -20℃ for six months after dissolution.

PIK-75

DMSO: ≥ 30 mg/mL

DNA-PK ,p110α ,p110γ ,p110δ

PIK-75 shows the impressive potency and isoform selectivity at p110α while the corresponding IC50 values are 1300 nM, 76 nM and 510 nM for other PI3K isoforms, p110β, -γ, and -δ, respectively. Furthermore, when binding to purified p110α, PIK-75 is a noncompetitive inhibitor with respect to ATP with Ki of 36 nM and competitive with respect to the substrate PI with Ki of 2.3 nM. PIK-75 also shows potent inhibition of DNA-PK. PIK-75 (1 μM) reduces cell survival by significantly decreasing mitochondrial activity in unstimulated nonasthmatic airway smooth muscle (ASM) cells, asthmatic ASM cells, and lung fibroblasts. While in TGFβ-stimulated ASM cells, PIK75 only decreases mitochondrial activity in asthmatic cells without effects in nonasthmatic cells. A recent study shows that PIK-75 (10 nM) inhibits TNF-α-induced CD38 mRNA expression and significantly attenuates of TNF-α-induced ADP-ribosyl cyclase activity in human airway smooth muscle cells.

In the ErbB3WT tumor model, PIK-75 reduces in vitro chemotactic response to HRGβ1 and lowers pAkt levels by 40%. Besides, PIK-75 significantly reduces tumor cell motility and in vivo invasion in ErbB3WT primary tumors. In the CD1 male mice, PIK-75 leads to serious impairments in the insulin tolerance test (ITT) and glucose tolerance test (GTT), and an increase in glucose production during a pyruvate tolerance test (PTT).

Dual blockade of lipid and cyclin-dependent kinases induces synthetic lethality in malignant glioma.
Cheng CK,et al. Proc Natl Acad Sci U S A. 2012 Jul 31;109(31):12722-7. PMID: