生物活性

• 靶点

  PI3Kα IC50:5nM

  PI3Kβ IC50:27nM

  PI3Kγ IC50:14nM

  PI3Kδ IC50:7nM

• 描述PI3K and mTOR are two critical signaling pathways that of high degree similarity of active sites and thus are important for cell growth and cancer treatment. GDC-0980 is a class 1 PI3K and mTOR kinase inhibitor with IC50 values of 5, 27, 7 and 14 nM for PI3Kα, β, δ and γ isoforms respectively. The Ki of GDC-0980 against mTOR is 17nM. Treatment with 1 μM GDC-0980 could also show >60% inhibition to some additional kinases like Fgr, Mlk1, Syk with IC50 VALUES of 697, 232, 134 nM respectively. In PC-3 and MCF-7 neo/HER2 cell lines, treatment with 1 mg/kg of this drug demonstrated significant antitumor activity and tumor growth delay. Tumor stasis or regressions were also observed with the concentration of 7.5 mg/kg, which further showed a high cellular potency and low plasma clearance^[1]. Treatment of GDC-0980 with IC50 <500nM demonstrated 100%, 78%, 88%, 67% and 33% inhibitions to prostate, breast, NSCLC, pancreatic and melanoma cell lines respectively, suggesting different reduction of viability in alternated cancer cells. Furthermore, phosphorylation of all downstream markers was reduced including phospho-Akt (at Thr308, Ser473 sites), phospho-S6 and phospho-ERK. The assessment results of cell cycle markers treated with 0.1 and 0.5 μM GDC-0980 found that Cyclin D1 expressed in most proliferating cells except for KP4 and A375 cell lines. Besides, cleaved PARP was also found in KPL4 and LoVo cell lines, suggesting an earlier apoptotic response to this drug. In a 20 xenograft tumor models, treatment of 5 mg/kg GDC-0980 resulted in 70% loss of body weight and 50% tumor growth inhibitions in 15 of the models. In pharmacokinetic mice model, 2.5 mg/kg of GDC-0980 could delay tumor growth. Tumor stasis and tumor regression were happened at higher concentrations that were 5 mg/kg and 10 mg/kg respectively. In the 2.5 mg/kg concentration group, undetectable GDC-0980 plasma levels was found as well as reduced baseline level of pAkt/tAkt that were 60% and 75% at 5 and 10 mg/kg concentration groups, suggesting GDC-0980 is an effective dual PI3K/mTOR inhibitor^[2].
• 作用机制GDC-0980 binds to mTORC1 and mTORC2, decreasing phospho-AktThr308 and Ser473, S6K and phospho-S6^[2].

• 动物研究
  剂量	Mice: 0.25 mg/kg - 10 mg/kg[2] (p.o.)
  给药途径	p.o.