RIPA lysis buffer was used to lysate cells. 34 Western blot analysis was performed using equal quantity of protein. Protein concentration was determined by Bradford method (Sigma‐Aldrich) and equal amounts were subjected to Western blot analysis. All membranes were incubated for 12 hours at 4°C with antibodies against sirt1, ERα, IGF1R, CCND1, vimentin, N‐cadherin, bax, bcl‐2, parp1 and cytochrome c (all from Santa Cruz Biotechnology, Santa Cruz CA, USA). Membranes were incubated with HRP‐conjugated secondary antibodies (Bethyl Laboratories, Montgomery, TX, USA), and immunoreactive bands were visualized with the ECL Western blotting detection system (Santa Cruz Biotechnology, Santa Cruz CA, USA). GAPDH (Santa Cruz Biotechnology, Santa Cruz CA, USA) or VDAC1/porin (Abcam, Cambridge, UK) antibodies were used as a loading control.

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