[Study on type I interferon and phospho-IRF3 in murine liver dendritic cells after intervened by HBV].

Objective To detect the secretions of type Ⅰ interferon and the expressions of phospho-IRF3 in murine liver dendritic cells intervened by HBV.Methods The murine liver dendritic cells were isolated via anti-CD11c microbeads and were incubated in the presence of GM-CSF and IL-4 to induce the DC generation and proliferation in 24-well cell culture plates.HBV virions were isolated via ultracentrifugation and were detected by quantitative Realtime-PCR.The DCs were divided into two groups:one group was cultured with HBV virions for 24 hours,the other group was cultured without HBV as control group.The cells were harvested at Oh,1h,2h,6h and 24h after being stimulated with poly I:C and the expressions of pIRF3 and the concentration of IFN β in supematants were detected with western blot and ELISA respectively.Results The IFN β concentrations at 0h,6h and 24h in the supernatants of the RBV group and the control group were(12.38±3.71)pg/ml,(88.67±9.01)pg/ml and(69.89±5.80)pg/ml vs(10.83±4.11)pg/ml,(137.68 ± 12.28) pg/ml and (72.25 ± 8.61) pg/ml,respectively. No statistical differences found at 0 h (t =0.8398,P > 0.05) and 24 h (t = 0.6820,P > 0.05) between the two groups except that at 6 h (t = 9.653,P <0.01). The expressions of phospho-IRF3 in HBV group were lower than that in control group. Conclusions The type Ⅰ interferon secretion and the phospho-IRF3 expression were decreased in murine liver dendritic cells when intervened by HBV. Key words: Hepatitis B virus; Poly I:C; Mice; Dendritic cells; Interferons