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描述 | The PI3K/AKT/mTOR pathway is among the most frequently altered pathways in cancer cell growth and survival. LY3023414 is a complex fused imidazoquinolinone with high solubility across a wide pH range designed to inhibit class I PI3K isoforms and mTOR kinase. The IC50 values of LY3023414 towards PI3K family members are 6.07 nM, 77.6 nM, 38 nM, 23.8 nM, 4.24 nM and 165 nM for PI3Kα, PI3Kβ, PI3Kδ, PI3Kγ, DNA-PK and mTOR, respectively. The compound is a novel, potent ATP-competitive inhibitor that demonstrates activity against PI3K, mTOR, and DNA-PK, thereby inducing cell-cycle effects and inhibiting cancer cell viability. Downstream target inhibition by LY3023414 occurs rapidly via an intermittent “on/off” mechanism that may enhance the drug's clinical tolerability, which may in turn allow LY3023414 to overcome some of the toxicities associated with PI3K/mTOR inhibitors and potentially reduce the emergence of feedback mechanisms leading to resistance. In vitro, inhibition of PI3K/AKT/mTOR signaling by LY3023414 caused G1 cell-cycle arrest and resulted in broad antiproliferative activity in cancer cell panel screens. In vivo, LY3023414 demonstrated high bioavailability and dose-dependent dephosphorylation of PI3K/AKT/mTOR pathway downstream substrates such as AKT, S6K, S6RP, and 4E-BP1 for 4 to 6 hours. In vivo mouse studies, LY3023414 was formulated in 1% HEC in distilled water containing 0.25% polysorbate 80 and 0.05% Dow-Corning Antifoam 1510-US and administered by oral gavage (final volume 0.2 mL) at 3, 6, or 10 mg/kg twice daily for 28 days which resulted in dose-responsive inhibition of tumor growth in the PTEN-deleted U87 MG xenograft model[4]. | ||
作用机制 | The compound binds in a pocket bounded by side-chain residues of Met953 and Ile963 on one side and Trp812 and Ile831 on the other. It makes a hydrogen bond with the main-chain amide of Val882 and a CH···O interaction with the main-chain carbonyl of Glu880. It additionally interacts with the tyrosine hydroxyl of Tyr867 and the main-chain amide and side-chain of Asp964[4]. |
实验方案 | |||
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1mg | 5mg | 10mg | |
1 mM 5 mM 10 mM |
2.46mL 0.49mL 0.25mL |
12.30mL 2.46mL 1.23mL |
24.60mL 4.92mL 2.46mL |
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