For research use only. Not Intended for Therapeutic Use!
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AZD8055 is a novel ATP-competitive mTOR inhibitor with IC50 of 0.8 nM with excellent selectivity (～1,000-fold) against PI3K isoforms and ATM/DNA-PK.
in vitro: AZD8055 shows low activity (～1,000-fold) against all PI3K isoforms (α, β, γ, δ) and other members of the PI3K-like kinase family (ATM and DNA-PK). AZD8055 inhibits the phosphorylation of mTORC1 (p70S6K and 4E-BP1) as well as phosphorylation of the mTORC2 (Akt) and downstream proteins. The rapamycin-resistant T37/46 phosphorylation sites on 4E-BP1 can be fully inhibited by AZD8055, resulting in significant inhibition of cap-dependent translation. AZD8055 potently inhibits proliferation in U87MG, A549 and H838 cells with IC50 of 53, 50 and 20 nM, respectively. AZD8055 also induces autophagy and increased LC3-II levels in H838 and A549 cells . AZD8055 decreases AML blast cell proliferation and cell cycle progression, reduces the clonogenic growth of leukemic progenitors and induces caspase-dependent apoptosis in leukemic cells but not in normal immature CD34+ cells.
in vivo: AZD8055 inhibits the pS6 and pAkt in U87MG and A549 xenografts at 2.5/10 mg/kg, which leads to tumor growth inhibition. AZD8055 shows significant antitumor activity in many xenografts, including U87MG, BT474c, A549, Calu-3, LoVo, SW620, PC3 and MES-SA at a dose of 10/20 mg/kg . AZD8055 induces ~40% reduction in tumour volume, accompanied by ablation of phosphorylation of Akt, S6K and SGK protein kinases. Administration of AZD8055 (5mg/kg, Bid) and SAHA (100 mg/kg/d) results in complete tumor growth inhibition in PTEN+/LKB1+/hypo xenografts without side effects on mice by inhibition of mTORC1 and mTORC2 signaling.