Abstract: Background: Sun ginseng (SG), a specific formulation of quality-controlled red ginseng contains approximately equal amounts of three major ginsenosides (RK1, Rg3, and Rg5), which reported has anti-tumor promoting activities in animal models.Method: MTT assay was employed to assess whether SG can potentiate the anticancer activity of epirubicin or paclitaxel in human cervical adenocarcinoma HeLa cells, human colon cancer SW111C cells, and SW480 cells; Apoptosis status was analyzed by Annexin V-FITC and PI and analyzed by flow cytometry; Apoptosis pathway was studied by analysis of caspas-3, -8, and -9 activation, mitochondrial accumulation of Bax and Bak, and cytochrome c release.Results: SG remarkably enhances cancer cell death induced by epirubicin or paclitaxel in human cervical adenocarcinoma HeLa cells, human colon cancer SW111C cells, and SW480 cells. Results of the mechanism study highlighted the cooperation between SG and epirubicin or paclitaxel in activating caspases-3 and -9 but not caspase-8. Moreover, SG significantly increased the mitochondrial accumulation of both Bax and Bak triggered by epirubicin or paclitaxel as well as the subsequent release of cytochrome c in the targeted cells.Conclusions: SG significantly potentiated the anticancer activities of epirubicin and paclitaxel in a synergistic manner. These effects were associated with the increased mitochondrial accumulation of both Bax and Bak that led to an enhanced cytochrome c release, caspase-9/-3 activation, and apoptosis. Treating cancer cells by combining epirubicin and paclitaxel with SG may prove to be a novel strategy for enhancing the efficacy of the two drug types.
Monthly Archives: August 2014
Ginsenoside fractions regulate the action of monocytes and their differentiation into dendritic cells – Accepted Manuscript
Abstract: Background: Ginseng, the root of Panax ginseng, has been extensively used in traditional oriental medicine and is a modern pharmaceutical reagent for the prevention of various human diseases, including cancer. Ginsenosides are the major active component of ginseng and exhibit immunomodulatory effects. However, the mechanism and function underlying such effects have not been fully elucidated, especially in human monocytes and dendritic cells (DCs).Methods: We investigated the immunomodulatory effect of ginsenosides from the root of Panax ginseng on CD14+ monocytes purified from human adult peripheral blood mononuclear cells (PBMC) and differentiation into DCs that affect CD4+ T cell activity.Results: The results showed that tumor necrosis factor (TNF)-α, interleukin (IL)-6 and IL-10 increased in monocytes upon treatment with ginsenoside fractions through phosphorylation of ERK1/2 (pERK1/2) and JNK, but not p38 MAP kinase. Interestingly, TNF-α production and phosphorylation of ERK1/2 and JNK decreased in lipopolysaccharide (LPS)-sensitized monocytes upon treatment with ginsenoside fractions. Next, we confirmed that DCs derived from CD14+ monocytes in the presence of ginsenoside fractions (Gin-DCs) contained decreased levels of the co-stimulatory molecules, CD80 and CD86. In the presence of ginsenoside fractions, expression of these co-stimulatory molecules decreased in LPS-treated DCs compared with LPS-treated DCs in the absence of ginsenoside fractions. Furthermore, Gin-DCs treated with LPS could not induce proliferation and IFN-γ production of CD4+ T cells at co-culture of Gin-DCs with CD4+ T cells.Conclusion: These results suggest that ginsenoside fractions from the ginseng root suppress cytokine production and maturation of DCs treated with LPS, resulting in the down-regulation of CD4+ T cells.
Comparative study of Korean White Ginseng and Korean Red Ginseng on efficacies of OVA-induced asthma model in mice – Accepted Manuscript
Abstract: Background: Korean ginseng is a well-known medicinal herb that has been widely used in traditional medicine to treat various diseases, including asthma. Ginseng can be classified as white or red ginseng, accordance to processing conditions. In this study, the authors compared the efficacies of these two ginseng types in mouse model of acute asthma.Methods: To produce the acute asthma model, BALB/c mice were sensitized with ovalbumin (OVA) and aluminum hydroxide, and then challenged with OVA. White and red ginseng extracts (WG and RG) were administered to mice orally. The influences of WG and RG on airway hyperresponsiveness (AHR), immune cell distributions in bronchoalveolar lavage fluid (BALF), and OVA-specific IgE, IgG1, and IgG2a in serum were investigated. Cytokine productions by lymphocytes isolated from peribronchial lymph nodes and histopathological changes also examined.Results: In OVA-sensitized mice, both WG and RG reduced AHR and suppressed immune cell infiltration in bronchoalveolar regions. BALF OVA-specific IgE levels were significantly lower in RG treated OVA-sensitized mice than in OVA-sensitized control group. WG and RG also suppressed inflammatory cytokine production by peribronchial lymphocytes. Histopathological findings showed reduced inflammatory cell infiltration and airway remodeling (e.g., epithelial hyperplasia) in WG and RG treated OVA mice than in OVA controls.Conclusion: In this study, WG and RG showed anti-asthmatic effects in an OVA-sensitized mouse model, and the efficacies of RG were found to be better than those of WG.