Long-Term Control of<i>Mycobacterium tuberculosis</i>Infection Is Mediated by Dynamic Immune Responses

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  • Vanja Lazarevic
    Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
  • Dawn Nolt
    Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
  • JoAnne L. Flynn
    Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh PA 15261

説明

<jats:title>Abstract</jats:title><jats:p>The primary goal of this study was to determine how chronic exposure to Ag influences the functionality of Mycobacterium tuberculosis-specific T cell responses. The frequency of IFN-γ-producing effector CD4+ and CD8+ T cells dynamically changed during persistent M. tuberculosis infection. CD8+ T cells used differential effector functions during acute and chronic phases of the immune response, where CD8+ T cells produced negligible amounts of IFN-γ early in infection, but switched to cytokine production during the chronic stage of infection. Using limiting dilution analysis, CD8+ T cells isolated during the initial phase of infection demonstrated lytic potential, but this waned in the chronic stage. The apparent loss of cytotoxic activity was not associated with the lack of perforin. Ag dose could potentially govern the functional program of CD8+ T cells. Collectively, these results depict a host immune response mounted against M. tuberculosis of a significantly more dynamic nature than previously recognized.</jats:p>

収録刊行物

  • The Journal of Immunology

    The Journal of Immunology 175 (2), 1107-1117, 2005-07-15

    The American Association of Immunologists

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