Abstract
The immunological diagnosis and development of new antituberculosis vaccines require the characterization of Mycobacterium tuberculosis antigens inducing cell-mediated immune responses. In this study, we have tested peripheral blood mononuclear cells (PBMC) from tuberculosis (TB) patients (n = 43) and Bacille Calmette-Guérin (BCG)-vaccinated healthy subjects (n = 24) for in vitro cellular immune responses, as indicated by antigen-induced proliferation and interferon (IFN)-gamma secretion, in response to a panel of complex (culture filtrate and cell wall preparations) and single recombinant antigens (Mtb8.4, Mtb9.8, Mtb9.9, Mtb32A, Mtb39A, Mtb40, Mtb41 and Ag85B) of M. tuberculosis. The results of cellular responses showed that the majority (ranging from 70 to 98%) of TB patients and healthy donors responded to the complex antigens in antigen-induced proliferation and IFN-gamma secretion assays. However, when PBMC from the same groups of patients and healthy donors were tested with the recombinant antigens, TB patients showed strong recognition (>50% responders) of Mtb9.8 and Mtb39A in proliferation assays (median SI = 6.2 and 6.4, respectively) and of Mtb9.8, Mtb39A, Mtb40 and Ag85B in IFN-gamma assays (median delta IFN-gamma= ...Continue Reading
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