Pleural fluid from tuberculous pleurisy inhibits the functions of T cells and the differentiation of Th1 cells via immunosuppressive factors

摘要

Immunosuppressive mediators in tuberculosis pleurisy (pleural fluid (PF)) are associated with the course of disease, but they remain poorly defined.To study the local immune status of patients with tuberculosis pleurisy, we examined the effect of PF on the functions of T cells and the differentiation of Th 1 cells.PF could inhibit the ability of T cells to produce cytokines.However, tumornecrosis factor (TNF)-α derived from non-T cells was not impaired.Further analysis indicated that cell activation and cell cycle progression were alsosuppressed.Moreover, PF could inhibit Thl cell differentiation.Importantly, we found that inhibitors of indoleamine 2,3-dioxygenase(IDO) and adenosine and neutralizing antibodies against IL-10 and transforming growth factor (TGF)-β could reverse cytokine production, suggesting that IDO, adenosine, IL-10 and Transforming growth factor-ft1 in PF might take part in impairing T-cellfunctions.Taken together, our data demonstrate for the first time that several immunopathological factors participate in the downregulation of T-cell functions in local PF.