Cells were seeded in 6-well-plates (2.5 x 105/well) and allowed to adhere for 24h. Whole-cell lysates were prepared using RIPA lysis-buffer containing protease inhibitor (1x, Sigma-Aldrich, St. Louis, Missouri, USA) and phosphatase inhibitor (1x, Merck Millipore, Darmstadt, Germany) and analyzed by Western blot as previously described (22 (link)). The primary antibody rabbit anti-AKT1 (#2938, Cell Signaling Technology) was used for specific AKT1-detection and the mouse anti-β-Actin (sc-47778, Santa Cruz Biotechnology) was used as loading control. Immunocomplexes were detected using peroxidase-conjugated mouse anti-rabbit IgG (sc-2357, 1:8000, Santa Cruz Biotechnology) and goat anti-mouse IgG (1030-05, 1:8000, Southern Biotech) followed by chemiluminescence detection (Westar Nova 2.0, Cyanagen Srl, Bologna, Italy) and Fuji Medical X-Ray Film (Fuji-film Corporation).
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