[Regulation on phenotypic and functional maturation of dendritic cells by apolipoprotein A-I].

AIM:to investigate the effects of apolipoprotein A-I (ApoA-I) on the peripherial blood dendritic cell (PBDC) and monocyte derived DC (MDDC) in vitro. METHODS:isolate PBDC or monocyte by cell isolation kit, monocyte were induced to MDDC by treated with GM-CSF plus IL-4 for 6 days, and then collect PBDC and MDDC treated them with apoA-I, LPS or TNF-α for 24 hours. Then check the cell surface marker and phagocytic capacity by flow cytometry. ELISA was used to detect the levels of cytokine secretion. T cells were stained with CFSE and T cell proliferation was assessed by flow cytometry. RESULTS:collect the PBDC and MDDC with high purity. In the presence of ApoA-I, the surface markers on MDDC, such as CD40, CD86 and MHC-II, were up-regulated which were detected by flow cytometry. CD83 expression on both PBDC and MDDC was remarkably increased. ApoA-I DC demonstrated decreased the phagocytic capacity. ApoA-I also stimulated MDDC to produce IL-12 and TNF-α. Furthermore, ApoA-I can induce considerable Th cell proliferation. CONCLUSION:ApoA-I can induce the maturation and activation of MDDC and PBDC, including the cytokine secretion, specific antigen presentation and T cell proliferation and decreasing the phagocytic capacity. Therefore, ApoA-I may attribute to the immune response in AS process.