Cells and tissues were lysed in ice-cold modified RIPA buffer (10 mm Tris-HCl, pH 7.5, 150 mm NaCl, 1 mm EDTA, 1% Igepal), as previously described30 (link). Protein samples were subjected to electrophoresis on NuPAGE 4–12% polyacrylamide gel (Thermo Fisher Scientific) and then transferred onto a nitrocellulose membrane (BioRad, CA, USA). Equal amounts of protein were Western blotted using the following antibodies: IBtk (#A303-001A; Bethyl Laboratories, Inc., Montgomery, TX, USA), GAPDH (#sc-47724; Santa-Cruz Biotechnology, Dallas, TX, USA), p53 (#sc-393031; Santa-Cruz Biotechnology), Bcl-XL (#2762, Cell Signaling Technology), c-Myc (#5605, Cell Signaling Technology), Bcl-2 (#7382, Santa-Cruz Biotechnology), Bim (#2933, Cell Signaling Technology), Mcl-1 (#D35A5 Cell Signaling Technology), p19ARF (#sc-32748; Santa-Cruz Biotechnology), Vinculin (V9131, Sigma-Aldrich).
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