LBP reverses RAPA-induced inhibition on Nrf2 nuclear expression in I/R-induced H9C2 cells. The nuclear (A) mRNA and (B) protein expression levels of Nrf2 in I/R-induced H9C2 cells with LBP (15 µg/ml) and RAPA treatment in combination or alone were calculated via RT-qPCR and western blotting. Lamin A was the internal control. The cytosolic (C) mRNA and (D) protein expression levels of Nrf2 in I/R-induced H9C2 cells treated with LBP (15 µg/ml) and RAPA in combination or alone were measured via RT-qPCR and western blotting, with GAPDH serving as an endogenous reference. **P<0.01, ***P<0.001 vs. I/R; ^^^P<0.001 vs. LBP-15; ###P<0.001 vs. RAPA. Nrf2, nuclear factor-erythroid factor 2-related factor 2; I/R, ischemia/reperfusion; LBP, Lycium barbarum polysaccharide; RAPA, rapamycin; RT-qPCR, reverse transcription-quantitative PCR.