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Chronic hepatitis B virus (HBV) infection is commonly considered to occur as a result of disturbance of the immune system. T-box expressed in T cells (T-bet) is an essential transcription factor for T helper (Th) cell differentiation and function. The aim of this study was to investigate the effect of T-bet overexpression on Th cell differentiation and the possible mechanism in chronic hepatitis B (CHB) patients. CD4+ T cells from the peripheral blood of 23 CHB patients, 8 acute hepatitis B (AHB) patients and 10 healthy controls were isolated. T-bet mRNA expression of CD4+ T cells was detected by quantitative real-time polymerase chain reaction (PCR). The T-bet DNA fragment was subcloned into the pGC-FU vector containing GFP to generate a recombinant lentiviral vector, pGC-FU-T-bet, while a no-load pGC-FU vector was used as the negative control. After transduction into CD4+ T cells from another 22 CHB patients, the induction of Th1- and Th2-type cytokines was assayed by an enzyme-linked immunosorbent assay (ELISA), and RT-PCR and western blot analysis were used to measure the mRNA and transcription levels of H2.0-like homeobox (HLX1), GATA-3 and STAT-6. T-bet mRNA expression in CD4+ T cells from AHB patients was enhanced compared with CHB patients and healthy controls. Th1-type cytokines and HLX1 expression was upregulated, while Th2-type cytokines and GATA-3 and STAT-6 expression was repressed after lentiviral introduction of T-bet. In conclusion, lentivirally overexpressed T-bet regulates Th cell lineage commitment in CHB patients, which may be mediated by regulating HLX1, GATA-3 and STAT-6 expression.

Lentivirally overexpressed T-bet regulates T-helper cell lineage commitment in chronic hepatitis B patients