Abstract
The process of T-cell activation in chronic hepatitis B virus (HBV) carriers has been investigated by measurement of membrane expression of lymphocyte-activation markers in response to a variety of mitogenic stimuli in order to delineate further the abnormality of T-cell-mediated immunity present in such patients. A substantial proportion of unstimulated T cells from the peripheral blood of patients but not controls expressed HLA-DR; in contrast the IL-2 and transferrin receptors were rarely expressed spontaneously in either group and there was no difference in spontaneous lymphocyte transformation. After stimulation with monocyte-dependent T-cell mitogens, phytohaemagglutinin (PHA) or anti-T3, patients had significantly reduced expression of the IL-2 and transferrin receptors and of HLA-DR in association with impaired lymphocyte transformations compared to controls. In contrast, lymphocyte activation was normal in response to the monocyte-independent T-cell mitogen phorbol-myristate-acetate (PMA). These data confirm that the process of T-cell activation is abnormal in chronic HBV carriers but suggest that the T cell is intrinsically normal. In allogeneic co-cultures, monocytes from patients inhibited the transformation of normal and patients' lymphocytes in response to PHA, suggesting that defects of T-cell-mediated immunity in chronic HBV carriers may be a consequence of monocyte dysfunction.
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