PSMB8 and infection: Compared with Ad-GFP infection, Ad-Psmb8 infection increased Psmb8 protein levels by approximately 1.5-fold (Fig. 5E) and dramatically suppressed the H/R-induced increases in the percentage of apoptotic cardiomyocytes (TUNEL assay) and mitochondrial division (MitoTracker red staining) (Fig. 5A, B).