Effects of extracellular polysaccharides from Paecilomyces Lilacinuson on phagocytosis function of mouse bone marrow-derived dendritic cells / 重庆医学

ABSTRACT

Objective To investigate the effects of Paecilomyces Lilacinuson extracellular polysaccharides on the phenotypic and function maturity of mouse dendritic ceils.Methods Mononuclear cells were isolated from the mouse bone marrow cavity and added with cytokines for obtaining the recombinant mouse granulocyte-macrophagocyte colony stimulating factor(rmGM-CSF),recombinant mouse interleukin 4(rmIL-4) was induced to differentiated to immature DCs.Then different concentrations of extracellular polysaccharides were used to conduct the intervention.The mature DCs surface marker CD11c,major histocompatibility complex Ⅱ (MHC Ⅱ),CD80,CD86 molecular expression and phagocytosing FITC-dextran ability was detected by the flow cytometry.The effect of the polysaccharides on DCs Toll-like receptor(TLR)2 mRNA and TLR4 mRNA expression was detected by RT-PCR.Results After 400 μg/mL polysaccharides action for 48 h,the expression of DCs surface molecules such as CD11c,MHC Ⅱ,CD80 and CD86 was significantly up-regulated compared with the blank control group (P＜0.05);after the polysaccharides action,the ability of DCs phagocytosing FITC-dextran was decreased,especially the effects of 300,400 μg/mL of polysaccharides were more significant compared with the control group (P＜0.05).In addition,the polysaccharides could down-regulate the expression of TLR2 mRNA and TLR4 mRNA in DCs,the DCs down-regulation effect after 100-400 μg/mL polysaccharides treatment,the difference compared with the blank control group was statistically significant(P＜0.05).Conclusion The extracellular polysaccharides can up-regulate the expression of DCs surface CD11c,MHC Ⅱ,CD80 and CD 86 molecules,decreases the phagocytosis ability and down-regulates the expression of TLR2 mRNA and TLR4 mRNA,which preliminarily indicates that the polysaccharides could stimulate the differentiation and maturation of murine DCs.