Cell proliferation assay is determined by 2 methods, MTS and Sytox Green. Briefly, cells are seeded in 96-well plates (at a density to allow for logarithmic growth during the 72-hour assay) and incubated overnight at 37°C, 5% CO₂. Cells are then exposed to concentrations of Capivasertib ranging from 30 to 0.003 μM for 72 hours. For the MTS endpoint, cell proliferation is measured by the CellTiter AQueous Non-Radioactive Cell Proliferation Assay reagent. Absorbance is measured with a Tecan Ultra instrument. For the Sytox Green endpoint, Sytox Green nucleic acid dye diluted in TBS-EDTA buffer is added to cells (final concentration of 0.13 μM) and the number of dead cells detected using an Acumen Explorer. Cells are then permeabilized by the addition of saponin (0.03% final concentration, diluted in TBS-EDTA buffer), incubated overnight and a total cell count measured. Predose measurements are made for both MTS and Sytox Green endpoints, and concentration needed to reduce the growth of treated cells to half that of untreated cells (GI₅₀) values are determined using absorbance readings (MTS) or live cell counts^[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Mice^[1]
Specific, pathogen-free, female nude mice (nu/nu: Alpk) and male SCID mice (SCID/CB17; 786-0 xenograft studies) are used. When mean tumor sizes reach approximately 0.2 cm3, the mice are randomized into control and treatment groups. The treatment groups received varying dose schedules of Capivasertib (AZD5363) solubilized in a 10% DMSO 25% w/v Kleptose HPB (Roquette) buffer by oral gavage, RP-56976 solubilized in 2.6% ethanol in injectable water by intravenous injection once on day 1 at 15 or 5 mg/kg once weekly. When administered in combination, RP-56976 is administered 1 hour before the oral dose of Capivasertib (AZD5363). The control group received the DMSO/Kleptose buffer alone, twice daily by oral gavage. Tumor volumes (measured by caliper), animal body weight, and tumor condition are recorded twice weekly for the duration of the study. Mice are sacrificed by CO2 euthanasia. The tumor volume is calculated (taking length to be the longest diameter across the tumor and width to be the corresponding perpendicular diameter) using the formula: (length×width)×√(length×width)×(π/6). Growth inhibition from the start of treatment is assessed by comparison of the differences in tumor volume between control and treated groups.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

• [1]. Davies BR, et al. Preclinical pharmacology of AZD5363, an inhibitor of AKT: pharmacodynamics, antitumor activity, and correlation of monotherapy activity with genetic background. Mol Cancer Ther. 2012 Apr;11(4):873-87.  [Content Brief]