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Background : Ginsenosides, the extract of Panax ginseng, exert various pharmacological effects such as anticancer activity by the mechanism that is not yet defined. In this study, we proposed that the anticancer effect of ginsenoside Rb1 is related to tumor cell apoptosis and ginsenoside Rb1 induces the tumor cell apoptosis via the nitric oxide (NO) production. Methods : Rat C6 glioma cells were activated by treating with lipopolysaccharide (LPS), interferon (IFN)- , and tumor necrosis factor (TNF)- on the culture medium to investigate the effects of ginsenoside Rb1. Results : Compared with C6 glioma cells treated with LPS/IFN- /TNF- , C6 glioma cells treated with LPS/IFN- /TNF- /ginsenoside Rb1 showed marked increase in the NO production and apoptosis. Ginsenoside Rb1 induces the NO production in C6 glioma cells in dose-dependent manner. When C6 glioma cells treated with LPS/IFN- /TNF- /ginsenoside Rb1 were incubated with the specific inhibitor of iNOS, S-Methyl-2-thiopseudoureasulfate (SMT), both NO production and apoptosis in C6 glioma cells was significantly decreased. Ginsenoside Rb1 induced the expression of iNOS mRNA and iNOS protein in C6 glioma cells. Conclusions : These results suggest that the induction of iNOS expression and subsequent

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