Description
Nutlin 3 is a commercial available p53-MDM2 inhibitor, with Ki of 90 nM.
Related Catalog
Signaling Pathways >> Apoptosis >> MDM-2/p53
Research Areas >> Cancer
In Vitro
Nutlin 3 is an inhibitor of the MDM2-p53 interaction. In particular, co-treatment of p53-positive HCT116 cells with 1 μM of Inauhzin and 2 μM of Nutlin 3 more significantly activated p53 as measured by its protein level as well as the level of its target p21, PUMA or cleaved PARP as indication of apoptosis[2]. Nutlin 3 is a small-molecule inhibitor that acts to inhibit MDM2 binding to p53 and subsequent p53-dependent DNA damage signaling. As a single agent, Nutlin 3 (2-10 μM) stabilizes p53 and p21WAF levels and is toxic to WTp53-22RV1 cells (IC50, 4.3 μM) but has minimal toxicity toward p53-deficient cells (IC50, >10 μM). Nutlin 3 induces p53 and p21WAF expression in a dose-dependent manner in 22RV1 cells. Short-term cell cycle assays show that, at a dose of 10 μM, Nutlin 3 increasea slightly the G1-phase fraction and decreasea S-phase fraction of all three cell lines[3].
In Vivo
Nutlin 3 can suppress the growth of xenograft tumors derived from human osteosarcoma or leukemia cells, the anti-tumor activity of Nutlin 3 even at the dose of 200 mg/kg per oral administration is marginal in an HCT116-derived xenograft tumor model[2]. Nutlin 3 may be a useful adjunct to improve the therapeutic ratio using precision radiotherapy targeted to hypoxic cells and warrants further study in vivo[3].
Cell Assay
Human non-small-cell lung carcinoma wild type p53-containing H460 and A549, human non-small-cell lung carcinoma p53-null H1299, and human colon cancer HCT116 (p53+/+ and p53-/-) cells are used. Cells (1.5×105) are plated into 6-well plates, and incubated at 37°C overnight. After treatment of Inauhzin and Nutlin 3 at the indicated concentrations for 48 h, cells are harvested, fixed in 70% ice-cold ethanol overnight at -20°C, resuspended in propidium iodide-solution (50 µg/mL PI, 0.1 mg/mL RNase A, 0.05% Tritin X-100 in PBS) for 40 min at 37°C, then analyzed for DNA content using a flow cytometer and proprietary software[2].
Animal Admin
Mice[2] Five-week-old female SCID mice are used. Mice are subcutaneously inoculated with 3×106 HCT116p53+/+ cells in the right flank and tumor growth is monitored with calipers. After the mean tumor volume reaches 50-100 mm3, animals are administered Inauhzin intraperitoneally (IP), Nutlin 3 orally, or vehicles (4% DMSO for Inauhzin, EtOH: Tween: 5% Glucose=5:5:90 for Nutlin 3). Tumor volume is measured every other day, and inhibition of tumor growth (T/C) is calculated on the last day of treatment.
References
[1]. Yu Z, et al. Design, synthesis and biological evaluation of sulfamide and triazole benzodiazepines as novel p53-MDM2 inhibitors. Int J Mol Sci. 2014 Sep 5;15(9):15741-53.
[2]. Zhang Y, et al. Inauhzin and Nutlin3 synergistically activate p53 and suppress tumor growth.Cancer Biol Ther. Cancer Biol Ther. 2012 Aug;13(10):915-24.
[3]. Supiot S, et al. Nutlin-3 radiosensitizes hypoxic prostate cancer cells independent of p53. Mol Cancer Ther. 2008 Apr;7(4):993-9.
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