Total proteins of the exosomes were extracted with standard RIPA buffer with PMSF (MCE, United States) at a volume ratio of 99:1, and the concentration of protein was normalized using the BCA assay. The protein samples (25 μg) were then subjected to 10% SDS-PAGE and transferred onto a membrane. The PVDF membrane was incubated with primary antibodies at 4°C overnight, including CD9, CD63, TSG101, and GRP94 (Abcam, ab92726, ab134045, ab125011, and ab238126 Cambs, United Kingdom), and then, the membrane was incubated with HRP-conjugated secondary antibodies (Abcam, Cambs, United Kingdom) for 1 h (Min et al., 2019 (link)).
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