Abstract
Aim:
To investigate the effects of safflor yellow A (SYA), a flavonoid extracted from Carthamus tinctorius L, on cultured rat cardiomyocytes exposed to anoxia/reoxygenation (A/R).
Methods:
Primary cultured neonatal rat cardiomyocytes were exposed to anoxia for 3 h followed by reoxygenation for 6 h. The cell viability was measured using MTT assay. The releases of lactate dehydrogenase (LDH) and creatine kinase (CK), level of malondialdehyde (MDA), and activities of glutathione (GSH), superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) were analyzed. Hoechst 33258 staining and changes in Bcl-2/Bax ratio and caspase 3 activity were used to examine A/R-induced apoptosis.
Results:
The A/R exposure markedly decreased the viability of cardiomyocytes, suppressed the activities of SOD, GSH, CAT and GSH-Px, and Bcl-2 protein expression. Meanwhile, the A/R exposure markedly increased the release of LDH and CK, and MDA production in the cardiomyocytes, and increased the rate of apoptosis, caspase 3 activity, Bax protein expression. Pretreatment with SYA (40, 60 and 80 nmol/L) concentration-dependently blocked the A/R-induced changes in the cardiomyocytes. Pretreatment of the cardiomyocytes with the antioxidant N-acetylcysteine (NAC, 200 μmol/L) produced protective effects that were comparable to those caused by SYA (80 nmol/L).
Conclusion:
SYA protects cultured rat cardiomyocytes against A/R injury, maybe via inhibiting cellular oxidative stress and apoptosis.
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Acknowledgements
This work was financially supported by National Natural Science Foundation of China (No 81173514 and 81001673), the “13115” Technology Innovation Project of Shaanxi Province (No 2010ZDKG-62), Xijing Research Boosting Program (No XJZT10D02) and Excellent Civil Service Training Fund of the Fourth Military Medical University (No 4138C4IDK6). The authors thank colleagues in the New Drug Research and Development Center of Xijing Hospital for their technical assistance.
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Duan, Jl., Wang, Jw., Guan, Y. et al. Safflor yellow A protects neonatal rat cardiomyocytes against anoxia/reoxygenation injury in vitro. Acta Pharmacol Sin 34, 487–495 (2013). https://doi.org/10.1038/aps.2012.185
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DOI: https://doi.org/10.1038/aps.2012.185
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