aureus-primed Gin-DCs for 5 days ( Fig. 6B). In addition, IFN-γ production decreased significantly (p < 0.05) under the same conditions ( Fig. 6C). These results suggest that ginsenoside fractions reduce the capacity of DCs to activate CD4+ T cells, compared to control DCs. The major findings of the current study were the following: (1) ginsenoside fractions increased the production of IL-6, IL-10, and TNF-α by human CD14+ monocytes; (2) treatment with ginsenoside
fractions increased the production click here of TNF-α through ERK1/2 and JNK signaling pathways, but they inhibited LPS-induced cytokine production; (3) ginsenoside fractions suppressed the expression of cell surface molecules during the differentiation of monocytes to DCs; and (4) Gin-DCs exhibited low expression of costimulatory molecules, Duvelisib cost thereby inhibiting their capacity to activate CD4+ T cells. The levels
IL-6, TNF-α, and IL-10, but not IL-1β, significantly increased in human monocytes after ginsenoside fraction treatment, which suggests that ginsenosides could modulate the action mode of monocytes. The expression of IL-10 increased in monocytes treated with ginsenosides, which interestingly indicated possible anti-inflammatory activity under inflammatory conditions. Ginsenoside showed no effect on IL-1β production. In LPS-stimulated human monocytes, TNF-α and IL-1β are differentially regulated [15]. Therefore, it is reasonable to assume that the various ginsenoside components exert different effects on cytokine induction. These results led us to investigate selleck chemicals llc the mechanism by which ginsenoside fractions induce cytokine production in monocytes. The Rg1 ginsenoside activates ERK1/2 in MCF-7 human breast cancer cells [16], and compound K activates JNK and p38 phosphorylation in HT-29 human colon cancer cells [17]. The anticancer and immune-regulative effects of ginseng are controversial. The ginsenoside Rg1 suppresses the expression of TNF-α, whereas Rh1 increases TNF-α expression
in THP-1 human leukemia cells [18]. In addition, the ginsenoside Rh1 inhibits the activation of MAPK signaling in THP-1 cells [19]. The ginsenosides Rg and Rh2 inhibit the production of proinflammatory cytokines via suppressing activator protein 1 and protein kinase A activity, but they have no effect on NF-κB activity [20]. Our results suggest that the ERK1/2 and JNK pathways, but not the p38 MAPK pathway, are responsible for the ginsenoside-mediated expression of TNF-α. Ginsenoside fraction-treated LPS-sensitized monocytes showed ERK1/2 and JNK phosphorylation that was superior to that of the cells stimulated with LPS alone. These results indicate that the ginsenosides are forceful activators of these signaling pathways. Our results further suggested that ginsenoside fractions modulate LPS-induced inflammatory effects in human monocytes.