Protein extraction of exosomes and cells as well as Western blot analysis were performed according to our previous study [22 (link)]. The following antibodies were used: anti-Lamin B1 (#13435, 1:1000), anti-HSP 70 (#4872, 1:1000), anti-p-mTOR (#5536, 1:1000), anti-mTOR (#2983, 1:1000), anti-P-gp (#13342, 1:500) (All from Cell Signaling); anti-CD63 (D360973, 1:500) and anti-HMGA2 (D160487, 1:500) (Both from BBI) and anti-GAPDH (CW0100, 1:1000, Beijing Com Win).
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