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  • P-ISSN 1010-0695
  • E-ISSN 2288-3339

Effect of Polygonati Sibirici Rhizoma on Cell Viability in Human Glioma Cells

Journal of Korean Medicine / Journal of Korean Medicine, (P)1010-0695; (E)2288-3339
2008, v.29 no.1, pp.95-105
Min-Soo Kim
Ji-Cheon Jeong
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Abstract

Objectives:Although herbal medicines containing flavonoids have been reported to exert anti-tumor activities, it has not been explored whether Hwang-Jeong (Polygonati sibirici Rhizoma, PsR) exerts anti-tumor activity in human glioma. The present study was therefore undertaken to examine the effect of PsR on cell viability and to determine its underlying mechanism in A172 human glioma cells. Methods:Cell viability was estimated by MTT assay. Reactive oxygen species generation and mitochondrial membrane potential were measured by the fluorescence dyes. The phosphorylation of kinases was evaluated by western blot analysis and caspase activity was estimated using colorimetric assay kit. Results:PsR resulted in loss of cell viability in a dose- and time-dependent manner. PsR did not increase reactive oxygen species (ROS) generation and the PsR-induced cell death was also not affected by antioxidants, suggesting that ROS generation is not involved in loss of cell viability. Western blot analysis showed that PsR treatment caused rapid reduction in phosphorylation of extracellular signal-regulated kinase (ERK) without changes in p38 and Jun-NH2-terminal kinase (JNK). U0126, an inhibitor of ERK, increased the PsR-induced cell death, but inhibitors of p38 and JNK did not affect the cell death. PsR induced depolarization of mitochondrial membrane potential. Caspase activity was not stimulated by PsR and caspase inhibitors did not prevent the PsR-induced cell death. Conclusion:Taken together, these findings suggest that PsR results in human glioma cell death through caspase- independent mechanisms involving down-regulation of ERK.

keywords
Polygonati sibirici Rhizoma, cell viability, ERK, mitochondrial membrane potential, human glioma cells., Polygonati sibirici Rhizoma, cell viability, ERK, mitochondrial membrane potential, human glioma cells.


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