Background
GDC-0068 is a selective, ATP-competitive, pan-Akt inhibitor that targets Akt1, 2, and 3 with IC50 values of 5, 18, and 8 nM, respectively in cell-free assays.1 It is 620-fold selective for Akt over protein kinase A and has been shown to block Akt signaling selectively in cultured tumor cell lines characterized by activated Akt, halting cell cycle progression and reducing cell viability.1 In multiple tumor xenograft models, oral administration of GDC-0068 at 100 mg/kg/day can lead to delayed tumor growth and regression.1
1.Lin, J., Sampath, D., Nannini, M.A., et al.Targeting activated Akt with GDC-0068, a novel selective Akt inhibitor that is efficacious in multiple tumor modelsClin. Cancer Res.19(7)1760-1772(2016)
Protocol
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Cell experiment:
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The 384-well plates are seeded with 2,000 cells per well in a volume of 54 μL per well followed by incubation at 37°C under 5% CO2 overnight (~16 hours). Compounds (e.g., Ipatasertib) are diluted in DMSO to generate the desired stock concentrations then added in a volume of 6 μL per well. All treatments are tested in quadruplicates. After 4 days incubation, relative numbers of viable cells are estimated using CellTiter-Glo and total luminescence is measured on a Wallac Multilabel Reader. The concentration of drug resulting in IC50 is calculated from a 4-parameter curve analysis (XLfit) and is determined from a minimum of 3 experiments. For cell lines that failed to achieve an IC50, the highest concentration tested (10 μM) is listed[2].
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Animal experiment:
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Mice[2] In vivo efficacy is evaluated in multiple tumor cell line- and patient-derived xenograft models. Cells or tumor fragments are implanted subcutaneously into the flank of immunocompromised mice. Female or male nude (nu/nu) or severe combined immunodeficient mice (SCID)/beige mice are used. For the MCF7-neo/HER2 model, 17β-estradiol pellets (0.36 mg/pellet, 60-day release) are implanted into the dorsal shoulder before cell inoculation. The LuCaP35V patient-derived primary tumors are obtained; male mice are castrated before implantation of tumor fragments. After implantation of tumor cells or fragments into mice, tumors are monitored until they reached mean tumor volumes of 180 to 350 mm3 and distributed into groups of 8 to 10 animals/group. Ipatasertib is formulated in 0.5% methylcellulose/0.2% Tween-80 (MCT) and administered daily (QD), via oral (per os; PO) gavage. Docetaxel is formulated in 3% EtOH/97% saline and dosed intravenously (IV) every week (QW) at 2.5 or 7.5 mg/kg. Carboplatin is formulated in saline and dosed intraperitoneally (IP) weekly at 50 mg/kg.
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参考文献:
[1]. Blake JF, et al. Discovery and preclinical pharmacology of a selective ATP-competitive Akt inhibitor (GDC-0068) for the treatment of human tumors. J Med Chem. 2012 Sep 27;55(18):8110-27.
[2]. Lin J, et al. Targeting activated Akt with GDC-0068, a novel selective Akt inhibitor that is efficacious in multiple tumor models. Clin Cancer Res. 2013 Apr 1;19(7):1760-72.
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