The effects of ginseng total saponin, panaxadiol and panaxatriol on ischemia/reperfusion injury in isolated rat heart
Introduction
Myocardial ischemia and reperfusion (I/R) is clinically relevant in situations such as myocardial infarction, coronary angioplasty, thrombolytic therapy, coronary revascularization and heart transplantation (Rao and Viswanath, 2007). Although the nature of this I/R injury has been extensively studied, the mechanisms by which organ damage occurs are not clear.
The production of reactive oxygen species (ROS) from various cellular metabolic processes caused by the restoration of coronary flow after cardiac ischemia is thought to contribute to the observed myocardial damage (Bolli, 1991, Gross et al., 1986, Zweier et al., 1987). These ROS cause non-specific damage to lipids, proteins and DNA, leading to an alteration or loss of the cellular function. The abrupt rise in ROS as a result of the reoxygenation of ischemic or hypoxic cardiac muscle has been associated with a partial irreversible inhibition of mitochondrial respiration (Xie et al., 1996). Alterations in generation and/or use of energy are thought to be important contributing factors to the observed dysfunction caused by I/R (Taniguchi et al., 2001). Rapid resumption of oxidative phosphorylation is critical for the restoration of adequate energy metabolism (ATP and creatine phosphate production) and cellular survival.
Panax ginseng C.A. Mayer (Araliaceae) is one of the most popular natural tonics and has been shown to possess various biological activities such as a protein anabolic effect, anti-tumor activities and an inhibitory effect of tumor angiogenesis and metastasis (Sato et al., 1994). Also, ginseng has been used for treatment of heart failure and to protect tissues from damage when an organism is in stress (Wagner and Liu, 1987). Moreover, ginseng has the advantage that it is free from harmful side effects. Ginsenosides, which are glycosides containing an aglycone (protopanaxadiol or protopanaxatriol), are the major effective components of ginseng and have been shown to have a wide variety of biological activities including immunomodulatory effects, antioxidant, anti-inflammatory and anti-tumor activity (Attele et al., 1999, Kenarova et al., 1990, Park et al., 2003, Shibata, 2001). However, it is still unknown which ginsenosides have beneficial effects on the cardiac injury caused by I/R.
Accordingly, we designed this study to investigate the effects of ginseng total saponin, panaxadiol and panaxatriol on post-ischemic heart injury, particularly on the oxidative stress and energy metabolism.
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Materials
Total saponin, panaxadiol, panaxatriol were isolated from 6 years old red ginseng by thin layer chromatography and high performance liquid chromatography, and supplied by Korea Ginseng and Tobacco Research Institute. Sodium pyruvate, lactate dehydrogenase (LDH), creatine kinase (CK) and ATP kits were purchased from Sigma Chemical Co. (St. Louis, MO, USA), and heparin sodium was supplied from Choongwae Pharmaceutical Co. (Suwon, Korea). All other chemicals were of the reagent grades commercially
Cardiac contractility function
As shown Table 1, cardiac contractile function and heart rate were similar for all experimental groups before ischemia. Total saponin, panaxadiol and panaxatriol alone did not affect pre-ischemic cardiac function and heart rate (data not shown). In the vehicle-treated group, cardiac contractile function and heart rate significantly depressed after 30 min reperfusion, indicating severe I/R damage. Total saponin and panaxatriol significantly improved cardiac function as shown in LVDP, DP and
Discussion
We examined the effects of total saponin, panaxadiol and panaxatriol on myocardial injury resulted from global ischemia and reperfusion in isolated rat hearts assessed by mechanical and biochemical evaluation. The main finding of this study indicates panaxatriol, a major saponin of Panax ginseng, provided marked cardioprotection in a well-characterized experimental model of myocardial I/R injury in the rats.
Cardiac dysfunction and myocardial enzyme leakage are characteristic of I/R injury in
Conflict of interest
The authors declare that there are no conflicts of interest.
Acknowledgments
We are grateful to Jong-Dae Park (KT&G Central Research Institute) and Dong-Kwon Rhee (Sungkyunkwan University) for the generous gift of total saponin, panaxadiol and panaxatriol and to Jin-Hyuk Park and Kyung-Hwan Yi for their expert technical assistance.
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