科研之友
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摘要
Lactobacilli have been widely studied for their probiotic effects and have been reported to function as antiviral and anticancer agents. However, the underlying mechanisms via immune modulation are poorly understood. PFT is a freeze dried compound of Lactobacillus kefiri P-IF with a unique composition and functionality. In this study, we examined the potential stimulatory effects of two concentrations (50 mu g and 100 mu g/mL) of PFT on human monocyte-derived dendritic cell (DC) function in vitro. Results showed that PFT upregulated the expression of DC surface co-stimulatory and maturation markers CD80, CD86, and HLADR in a concentration dependent manner. PFT at 100 mu g/mL markedly increased the secretion of IL-6, IL-10, TNF-alpha, and IL-1 beta by DCs. This concentration of PFT also stimulated the production of antiviral cytokines, IFN-alpha and IFN-lambda(IL29) in DCs. Additionally, PFT at 100 mu g/mL activated moDCs prime CD4(+)T cells and significantly increased the levels of IL-10, IFN-gamma, and TNF-alpha by 1.7, four, three-fold, respectively. Furthermore PFT-stimulated DCs were also effective in enhancing the cytotoxic potential of CD8(+)T cells via the induction of Granzyme-B and upregulation of CD107a, and CD103 expression, a marker of resident/regulatory CD8(+)T cells. These data suggest that PFT functions as a natural adjuvant for DC activation and thus may be used in DC-based vaccine strategies against viral infections and cancer.
