恩替卡韦对慢性乙型肝炎患者树突状细胞功能的体外影响

Effects of adefovir dipivoxil on the function of dendritic cells from chronic HBV-infected patients in vitro

AIM: To find out effects of adefovir dipivoxil (ADV) on the function of dendritic cells (DCs) from peripheral blood of chronic HBV-infected patients in vitro.

METHODS: Monocytes (Mo) were purified from peripheral blood of healthy volunteers and HBV-infected patients with incubation of granulocyte/macrophage colony stimulating factor (GM-CSF), interleukin-4 (IL-4) and ADV at different concentrations (20, 100, 500 µg/L) added on day 6. DC's morphology was observed under inverted microscopy and the expressions of CD1a, CD83, CD86 and MHC-DR on DCs were analyzed using FACS. The ability to stimulate the proliferation of allogenic T cells by DCs was detected using methyl thiazolyl tetrazolium (MTT). The levels of IL-12 p40+p70 in culture supernatant of DCs were determined using ELISA.

RESULTS: Compared with HBV-infected patient group, a better differentiation of DCs, enhanced proliferation of allogenic T cells and increased secretion of IL-12 p40+p70 were observed in ADV treatment group. The DCs with 100 µg/L ADV had the highest expression of CD1a, CD83, CD86 and MHC-DR, significantly higher than those of DCs without ADV treatment (43.5 ± 5.7 vs 20.6 ± 2.8, 34.6 ± 1.9 vs 16.7 ± 3.4, 40.9 ± 2.8 vs 25.8 ± 6.6, 66.9 ± 5.4 vs 40.7 ± 4.2, all P < 0.05), but all lower than the healthy controls. Differences among the three groups were statistically significant (P < 0.05).

CONCLUSION: ADV enhances the immune ability of DCs from peripheral blood of HBV-infected patients, suggesting that ADV possibly participates in the immune response through modulation of function of DCs and plays an indirect antivirus role.