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• W2012012488 abstract "SUMMARY 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)-γ 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-γ 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 (&gt;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-γ assays (median delta IFN-γ= 15.5, 10.8, 7.8 and 8.1 U/ml, respectively). BCG-vaccinated healthy donors showed weak (&lt;30% responders) to moderate (31–50% responders) responses to all of the recombinant antigens in both assays. When PBMC of a subset of TB patients (n = 11) were tested for secretion of protective Th1 cytokines [IFN-γ, tumour necrosis factor (TNF)-α and interleukin (IL)-12] and the immunosuppressive cytokine IL-10, the complex CF and CW antigens as well as the recombinant Mtb9.8, Mtb9.9, Mtb40 and Ag85B induced the secretion of both types of cytokines. On the other hand, Mtb41 induced only IL-10, while Mtb8.4, Mtb32Aand Mtb39A induced the secretion of one or more of Th1 cytokines, but not IL-10. In conclusion, the recombinant antigens inducing the secretion of Th1 cytokines could be useful as subunit vaccine candidates against TB." @default.
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• W2012012488 date "2004-08-31" @default.
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• W2012012488 title "<i>In vitro</i>cellular immune responses to complex and newly defined recombinant antigens of<i>Mycobacterium tuberculosis</i>" @default.
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• W2012012488 doi "https://doi.org/10.1111/j.1365-2249.2004.02609.x" @default.
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