The influence of PEG-IFN-α 2a on the expression of ICOS on CD4+ T cell in patients with chronic hepatitis B / 中华微生物学和免疫学杂志

ABSTRACT

Objective To study the expression levels of inducible costimulator (ICOS) on CD4+ T cells in peripheral blood in patients with chronic hepatitis B and its change after treated with interferon.Methods All 56 patients were divided into two groups (interferon group has 28 cases,lamivudine group has 28 cases),and interferon group treated by PEG-IFN-α 2a,lamivudine group treated by lamivudine,respectively.There were 20 healthy individuals as control group.The levels of ICOS on CD4+ T cells of patients with chronic hepatitis B were kinetically detected by flow cytometry.The copies of HBV DNA in sera were dynamically detected by real-time PCR.Results The levels of ICOS on CD4+ T cells in patients with chronic hepatitis B was higher than that of normal controls(P＜0.001 ).However,the expressions of ICOS on CD4+ T cells in patients could be deduced by PEG-IFN-α 2a and obviously decreased after treatment.There was significant difference between interferon group and lamivudine group (P＜0.05 in 24 weeks,and P＜0.01 in 48 weeks).After treatment,the change values of ICOS in interferon group was positively correlated with the change copies of HBV DNA (r =0.972,P＜0.001 ).However,the change values mentioned above that did not find correlation in lamivudine group(r=-0.101,P=0.608).Conclusion The study shows the patients with chronic hepatitis B have disordered in cellular immunity and increased with the expression of ICOS on CD4+ T cells.PEG-IFN-α 2a could decrease the expression of ICOS on CD4+ T cells in patients,and correct the Th2 type immune polarization to some extent,and that plays a positive role in antiHBV.