[An association of the reduction in the count of T1 cells in the peripheral blood of patients with pulmonary tuberculosis with the lower monocytic expression of costimulatory CD80 molecules].

The percentage of T1 lymphocytes in the presence of the unchanged content of T2 cells were shown to be decreased in the peripheral blood of patients with pulmonary tuberculosis as compared with apparently healthy donors. In addition, the patients were found to have a significantly reduced quantity of CD80-expressing monocytes, the relative quantities of Th1 and Tc1 cells were directly related to the count of CD80+ monocytes. It is suggested that decreased CD80+ cells is a cause of ineffective antigen presentation that results in a systemic reduction in the count of CD4+ and CD8+ cells producing T1 cytokines and in impairment of an effective specific T1 response.