The p53-MDM2 HTRF assay is performed in buffer containing 50 mM Tris-HCl, pH 7.4, 100 mM NaCl, 1 mM DTT, 0.02 or 0.2 mg/mL BSA. Small-molecule inhibitors are stored in aliquots as 10 mM stock solutions in DMSO at 4°C in 96-deep-well plates. It is thawed and mixed immediately prior to testing. The compound is incubated with GST-MDM2 and a biotinylated p53 peptide for one hour at 37°C. Phycolink goat anti-GST (Type 1) allophycocyanin and Eu-8044-streptavidin are then added and followed by one hour incubation at room temperature. Plates are read using the Envision fluorescence reader. IC₅₀ values are determined from inter-plate duplicate or triplicate sets of data.

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

Cell proliferation is evaluated by the tetrazolium dye assay. The concentration at which 50% inhibition (IC₅₀) or 90% inhibition (IC₉₀) of cell proliferation is determined from the linear regression of a plot of the logarithm of the concentration versus percent inhibition.

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

At 10 to 12 weeks of age, mice are implanted with a 1:1 mixture of human SJSA osteosarcoma cells (ATCC) suspended in phenol-free Matrigel and PBS. Mice are implanted in the right flank at a concentration of 5×10⁶ cells in 0.2 mL total volume. At approximately day 10, animals are randomized according to tumor volume, so that all groups of 10 randomized mice have similar starting mean tumor volumes of 100 to 250 mm³. RG7388 is administered as an amorphous solid dispersion microbulk precipitate powder containing 30% drug substance and 70% hydroxypropyl methylcellulose acetate succinate polymer that is reconstituted immediately before administration as a suspension in Klucel/Tween, and remaining suspension is discarded after dosing.

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

• [1]. Ding Q, et al. Discovery of RG7388, a potent and selective p53-MDM2 inhibitor in clinical development. J Med Chem. 2013 Jul 25;56(14):5979-83.

  [2]. Higgins B, et al. Preclinical optimization of MDM2 antagonist scheduling for cancer treatment by using a model-based approach. Clin Cancer Res. 2014, 20(14), 3742-3752.

616.48

C₃₁H₂₉Cl₂F₂N₃O₄

1229705-06-9

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Room temperature in continental US; may vary elsewhere