Western blot analysis and ELISA were performed to investigate the mechanisms underlying the protective effects of TP against I/R in cardiac tissues. (A and B) Western blot analysis was used to measure the protein expression levels of Bcl2, Bax, LOX-1 and NF-κB. (C) ELISA analysis was used to determine the inhibitory effects of TP on the expression of inflammation-associated proteins, TNF-α, IL-1β and IL-6. (D and E) Biochemical analyses revealed the alterations in SOD, MDA and CAT. ***P<0.001, compared with the control group. #P<0.05, ##P<0.01, ###P<0.001, compared with the I/R group (n=6). Bax, Bcl2-associated X protein; Bcl2, B-cell lymphoma 2; (C), cytoplasmic; CAT, catalase; IL, interleukin; I/R, ischemia/reperfusion; LOX-1, lectin-like oxidized low-density lipoprotein receptor-1; MDA, malondialdehyde; (N), nuclear; NF-κB, nuclear factor-κB; PDTC, pyrrolidine dithiocarbamate; SOD, superoxide dismutase; TNF-α, tumor necrosis factor-α; TP, triptolide.