Western blotting was performed as previously described with minor modifications39 (link). In brief, whole-cell lysates were prepared in RIPA buffer supplemented with a proteinase-inhibitor cocktail. The lysates were clarified by centrifugation, the supernatant was boiled, and separated by SDS-PAGE. The following antibodies were used for western blots: anti-α-tubulin (Santa Cruz Biotechnology, Santa Cruz, CA, USA, B-5–1–2) and anti-IGFBP2 (Santa Cruz Biotechnology, Santa Cruz, CA, USA, C-18).
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