Immunoblotting was performed as previously described [6 (link)]. Proteins were detected using primary anti-CD9 (ab92726, Abcam, Cambridge, MA), anti-TSG101 (T5701, MilliporeSigma, St. Louis, MO), anti-Alix (ab186429, Abcam), anti-iNOS (13120S, Cell Signaling), anti-Arg-1 (93668S, Cell Signaling), anti-GAPDH (437,000, Thermo Fisher Scientific), anti-P (phospho)-Akt Ser473 (4060, Cell Signaling), anti-P-Akt Thr308 (13,038, Cell Signaling), and anti-Akt (4685, Cell Signaling) antibodies. Exposure of the resultant protein bands was performed with an ImageQuant LAS 4000 Luminescent Image Analyzer (GE Healthcare; Chicago, IL).
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