Cells were lysed in RIPA buffer (Beyotime, Jiangsu, China) containing a protease inhibitor cocktail (Sigma, St. Louis, CA, USA). Total protein was assessed using a BCA Protein Assay Kit (Beyotime). Western blot analysis was performed as previously described [18 (link)]. Antibodies against the following were used in this study, PABPC1 (1:1000, Abcam, SF, USA), IFI27, HA tag, Flag tag, TSG101, CD63, CD9, PCNA, Alix, Ki67, caspase 3, CXCL10, CD34, cleaved-PARP, PARP, eIF4G, cleaved caspase 9, caspase 9, ERK, p-ERK, IFI27, STAT3, p-STAT3, STAT1, p-STAT1, NF-kB, p-NF-kB, β-actin and GAPDH (all 1:1000, Cell Signaling Technology, MA, USA), EXOSC2 and EXOSC4 (both 1:1000, Santa Cruz, MA, USA).
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