Fig. 1

Characterization of exosomes secreted by A549 cancer cells. a Electron micrograph of exosomes derived from A549 cancer cells. Scale bar = 200 nm. b Detection of HSP70and CD63 expression in exosomes by Western blot. A549 cells lysate was used as positive control with loading mass of 20 μg total proteins. Samples represent A549 exosomes. Sample 1 was 1 μg loaded. Sample 2 was 10 μg. c Internalization of DiO-labled A549 cancer cells derived exosomes at 2 h in MSCs. Scale bar = 100 um