Pilaralisib (XL147; SAR245408) 是一种有效的选择性 I 类 PI3Ks 抑制剂，抑制 PI3Kα，PI3Kβ，PI3Kγ 和 PI3Kδ，IC₅₀ 分别为 39 nM，383 nM，23 nM 和 36 nM。

Pilaralisib (XL147; SAR245408) is a potent and highly selective class I PI3Ks inhibitor with IC 50 s of 39 nM, 383 nM, 23 nM and 36 nM for PI3Kα, PI3Kβ, PI3Kγ, and PI3Kδ.

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PI3Kα 39 nM (IC50) PI3Kβ 383 nM (IC50

Pilaralisib (XL147) displays potent inhibitory activity against Class I PI3K isoforms p110α, p110δ, and p110γ, with IC50s of 39, 36, and 23 nM, respectively. Pilaralisib (XL147) is less potent against the remaining Class I isoform, p110β, with an IC50 value of 383 nM. The IC50 value for inhibition of PI3Kα by Pilaralisib (XL147) is determined at various concentrations of ATP, revealing XL147 to be an ATP-competitive inhibitor with an equilibrium inhibition constant (Ki) value of 42 nM. Pilaralisib (XL147) has relatively weak inhibitory activity toward the class III PI3K vacuolar sorting protein 34 (VPS34; IC50 value of ~7.0 M) and the PI3K-related DNA-dependent protein kinase (DNA-PK; IC50 value of 4.75 μM). In an mTOR kinase immunoprecipitation assay using cell lysates, Pilaralisib (XL147) does not inhibit mTOR

The ability of Pilaralisib (XL147) to inhibit this endogenous phosphorylation of AKT, p70S6K, and S6 is examined following a single oral dose of 10, 30, 100, or 300 mg/kg. The tumors are harvested 4, 24, or 48 hours postdose and homogenized in lysis buffer. Tumor lysates from each animal (n=4) are then pooled for each group and analyzed for levels of total and phosphorylated AKT, p70S6K, and S6 by Western immunoblotting. Administration of Pilaralisib (XL147) causes a dose-dependent decrease in phosphorylation of AKT, p70S6K, and S6 in the tumors, reaching a maximum of 81% inhibition of AKT phosphorylation at 300 mg/kg at 4 hours. The dose-response relationships derived from the 4-hour time point predict 50% inhibition of AKT, p70S6K, and S6 phosphorylation at doses of approximately 100 mg/kg (pAKT), 54 mg/kg (pAKT), 71 mg/kg (p-p70S6K), and 103 mg/kg (pS6). The inhibition of A

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[1]. Foster P, et al. The Selective PI3K Inhibitor XL147 (SAR245408) Inhibits Tumor Growth and Survival and Potentiates the Activity of Chemotherapeutic Agents in Preclinical Tumor Models. Mol Cancer Ther. 2015 Apr;14(4):931-40.

In Vitro: DMSO : ≥ 100 mg/mL (184.84 mM)配制储备液