Rutaecarpine prevents hypoxia-reoxygenation-induced myocardial cell apoptosis via inhibition of NADPH oxidases |
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Authors: | Bao Mei-Hua Dai Wen Li Yuan-Jian Hu Chang-Ping |
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Institution: | Department of Pharmacy, Changsha Medical University, China. |
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Abstract: | It is proposed that myocardial cell apoptosis causes ventricular remodeling and heart failure. The aim of the present study was to determine the effects of rutaecarpine (Rut) on hypoxia-reoxygenation (H-R)-induced apoptosis in myocardial cell line H9c2, as well as the underlying mechanisms. Cultured H9c2 cells were exposed to hypoxia for 24 h, followed by 12 h reoxygenation. Rut (in concentrations of 0.1, 1, and 10 μmol/L) was added 1 h prior to H-R. Cell viability and lactate dehydrogenase were measured to evaluate the cell injuries. Apoptosis was evaluated by Hoechst 33258 staining and flow cytometry. NADPH oxidase activity was measured by assay kit; intracellular reactive oxygen species (ROS) generation was detected by 2',7'-dichlorofluorescein diacetate; and Nox2, Nox4, and p47(phox) mRNA and protein expression were analyzed by real-time PCR and Western blotting, respectively. The results showed that H-R significantly decreased cell viability and increased the lactate dehydrogenase release, as well as the apoptotic rate, concomitantly with enhanced NADPH oxidase activity. H-R also upregulated mRNA and protein expressions of Nox2, Nox4, and p47(phox) and increased ROS production. Treatment with Rut markedly reversed these effects introduced by H-R. These results suggest that the protective effects of Rut against H-R-induced myocardial cell injury and apoptosis might, at least partly, be due to the inhibition of the NADPH oxidase - ROS pathway. |
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