Ginsenoside Rb1 Preconditioning Protects Against Myocardial Infarction After Regional Ischemia and Reperfusion by Activation of Phosphatidylinositol-3-kinase Signal Transduction |
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Authors: | Zhi Wang Min Li Wei-kang Wu Hong-mei Tan Deng-feng Geng |
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Institution: | (1) Department of Anesthesiology, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510120, People’s Republic of China;(2) Department of Pathophysiology, Institute of Integrated Traditional Chinese and Western Medicine, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, People’s Republic of China;(3) School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China;(4) Department of Cardiology, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510120, People’s Republic of China; |
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Abstract: | Background Ginsenoside Rb1, a major bioactive component of Panax ginseng, bears various beneficial effects on the cardiovascular system. This study investigated whether ginsenoside Rb1 preconditioning
has protective effects on myocardial ischemia–reperfusion injury and its potential mechanism.
Methods Rats subjected to 45 min of myocardial ischemia followed by 120 min of reperfusion were assigned to the following groups:
sham-operated, ischemia–reperfusion (I/R), ginsenoside Rb1+I/R, wortmannin(a specific PI3K inhibitor)+I/R, wortmannin drug
vehicle (dimethyl sulfoxide, DMSO), wortmannin+sham, ginsenoside Rb1+ wortmannin +I/R. Infarct size was assessed by triphenyltetrazolium
chloride staining. Plasma creatine kinase (CK), creatine kinase isoenzyme MB (CK-MB), lactate dehydrogenase (LDH), and troponin
T levels were also measured. Akt phosphorylation expression was assessed by immunoblotting.
Results Ginsenoside Rb1 preconditioning reduced infarct size compared with that in the I/R group: 30 ± 2.6% versus 51 ± 2.7% (p < 0.01). Ginsenoside Rb1 preconditioning also markedly reduced the plasma CK, CK-MB, LDH and troponin T levels in blood.
Akt phosphorylation expression increased after ginsenoside Rb1 preconditioning. These effects of ginsenoside Rb1 preconditoning
were significantly inhibited by wortmannin.
Conclusion This is the first study to demonstrate that ginsenoside Rb1 preconditioning has protective effects on myocardial ischemia
and reperfusion injury, partly by mediating the activation of the PI3K pathway and phosphorylation of Akt.
Project supported by the National Basic Research Program of China (a.k.a. 973 Program) (No.2005CB523305). |
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Keywords: | Ginseng Ginsenoside Rb1 Myocardial reperfusion injury Infarct size Phosphatidylinositol-3-kinase Wortmannin Akt |
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