3CAI (Synonyms: 3-chloroacetyl Indole)

Kinase experiment:

The kinase assay is performed. Briefly, the reaction is carried out in the presence of 10 μCi of [γ-32P]ATP with each compound (e.g., 3CAI, 0.5, 1, 2 and 4 μM) in 40 μL of reaction buffer containing 20 mM HEPES (pH 7.4), 10 mM MgCl2, 10 mM MnCl2, and 1 mM dithiothreitol. After incubation at room temperature for 30 min, the reaction is stopped by adding 10 μL protein loading buffer and the mixture is separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The relative amounts of incorporated radioactivity are assessed by autoradiography[1].

Cell experiment:

HCT116 or HCT29 colon cancer cells are plated into 60-mm culture dishes (1×105 cells/dish) and incubated for 1 day in medium containing 10% FBS. The culture medium is then replaced with a 1% serum medium and cultured for 4 days with 3CAI (4 μM), I3C or a commercial AKT inhibitor. The cells are collected by trypsinization and washed with phosphate buffered saline (PBS). The cells are resuspended in 200 μL of binding buffer. Annexin V staining is accomplished. The cells are observed under a fluorescence microscope using a dual filter set for FITC and propidium iodide and then analyzed by flow cytometry[1].

Animal experiment:

Mice[1]Athymic mice [Cr:NIH(S), NIH Swiss nude, 6-9 wk old] are divided into five groups: 1) untreated vehicle group (n=15); 2) 20 mg 3CAI/kg of body weight (n=15), 3) 30 mg 3CAI/kg body weight (n=15); 4) 100 mg I3C/kg of body weight (n=15); 5) no cells and 30 mg 3CAI/kg of body weight (n=15). HCT116 cells (3×106 cells/100 μL) are suspended in serum free McCoy's 5A medium and inoculated subcutaneously into the right flank of each mouse. 3CAI, I3C or vehicle is administered orally 5 times per week for 21 days. Tumor volume is calculated. Mice are monitored until tumors reach 1 cm3 total volume, at which time mice are euthanized and tumors are extracted.

References:

[1]. Kim DJ, et al. (3-Chloroacetyl)-indole, a novel allosteric AKT inhibitor, suppresses colon cancer growth in vitro and in vivo. Cancer Prev Res (Phila). 2011 Nov;4(11):1842-51.