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Protective Effect of Korean Ginseng on Cytotoxicity Induced by 2,2',5,5'-Tetrachlorobiphenyl in Human Neuronal SK-N-MC Cells  

Hwang Sang-Gu (Department of Pathology, College of Oriental Medicine, Wankwang University)
Kim Ji Su (Department of Pathology, College of Oriental Medicine, Wankwang University)
Lee Hyung Chul (Department of Pathology, College of Oriental Medicine, Wankwang University)
Lee Young Chan (Department of Pathology, College of Oriental Medicine, Wankwang University)
Jeong Young Mok (Department of Pathology, College of Oriental Medicine, Wankwang University)
Jeong Woo Yeal (Department of Pathology, College of Oriental Medicine, Wankwang University)
Jeon Byung Hun (Department of Pathology, College of Oriental Medicine, Wankwang University)
Publication Information
Journal of Physiology & Pathology in Korean Medicine / v.16, no.1, 2002 , pp. 172-180 More about this Journal
Abstract
Polychlorinated biphenyls(PCBs) are large scale industrial chemicals which are using in diverse applications. The goal of this study was to determine if exposure to 2,2',5,5'-tetrachlorobiphenyl (PCB 52) leads to an increase in the production of active oxidants, and subsequently promotes apoptosis of neuronal SK-N-MC cells. Reactive oxygen species (ROS) formation was examined in SK-N-MC cells after treatment of PCB 52 by concentrations and incubation times, respectively. It showed that the rate of ROS production in the cells was increased in a does-dependent manner to 45 min, followed by a return towards control levels after 120 min treatment. We also examined the association of PCB-induced apoptosis with the modulation of biomakers of oxidative damage to lipids (malondialdehyde [MDA]) in SK-N-MC cells. Increased MDA was observed in a dose-dependent manner in groups treated with 10, 15, and 20 figJ me of PCB 52 for 24 h. After treatment of PCB 52, the cells did not show any significant change in the rate of Cu/Zn-superoxide dismutase (Cu/Zn-SOD) activity. Whereas, the cells had a two-fold greater rate of change in catalase activity at 20 ㎍/㎖ of PCB 52 for 24 h when compared to control group. Korean Ginseng is one of the most important crude drugs which has been used as a traditional Oriental medicine. We next investigated protective effect of extracts of ginseng on cytotoxicity induced by PCB 52 in SK-N-MC cells. Pretreatment of SK-N-MC cells with 25-200 μg/ml of ginseng were reduced cell death in a dose-dependent manner in PCB 52-treated cells. To examine the sensitivity of beta-catenin to ginseng, the protective effect of a range of ginseng concentrations was examined in SK-N-MC cells treated with PCB 52. The result demonstrated that ginseng efficiently blocked PCB 52 inducible beta-catenin proteolysis in a concentration dependent manner. The ROS formation was also measured in the presences of extract of ginseng and superoxide dismutase (inhibitor of oxygen free radical production). The both SOD (400 U/ml) and ginseng (200 μg/ml) significantly inhibited RDS generation in PCB 52-treated group.
Keywords
PCB 52; neuronal SK-N-MC cells; oxidative stress; cytotoxicity; ginseng;
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