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Infection and Immunity, October 1999, p. 5223-5230, Vol. 67, No. 10
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Characterization of Human Mycobacterium bovis Bacille Calmette-Guérin-Reactive CD8+ T Cells

Steven M. Smith,1,* Adam S. Malin,1 Pauline T. , Lukey,2 Sara E. Atkinson,1 Jean Content,3 Kris Huygen,4 and Hazel M. Dockrell1

Immunology Unit, Department of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London,1 and Glaxo-Wellcome Research and Development, Stevenage,2 United Kingdom, and Departments of Virology3 and Mycobacterial Immunology,4 Pasteur Institute of Brussels, B1180 Brussels, Belgium

Received 22 March 1999/Returned for modification 5 May 1999/Accepted 5 July 1999

Gamma interferon (IFN-gamma )-secreting CD4+ T cells have long been established as an essential component of the protective immune response against Mycobacterium tuberculosis. It is now becoming evident from studies with the murine model of tuberculosis that an important role also exists for major histocompatibility complex (MHC) class I-restricted CD8+ T cells. These cells are capable of acting as both IFN-gamma secretors and cytotoxic T lymphocyte (CTL) effectors; however, their exact role in immunity against tuberculosis remains unclear. This study demonstrates the presence of Mycobacterium bovis BCG-reactive CD8+ T cells in healthy BCG-vaccinated donors and that these CD8+ T cells are potent cytokine producers as well as cytotoxic effector cells. Using FACScan analysis, we have shown that restimulation with live M. bovis BCG induced more CD8+-T-cell activation than the soluble antigen purified protein derivative and that these cells are actively producing the type 1 cytokines IFN-gamma and tumor necrosis factor alpha (TNF-alpha ). These CD8+ T cells also contain the cytolytic granule perforin and are capable of acting as potent CTLs against M. bovis BCG-infected macrophages. The mycobacterial antigens 85A and B (Ag85A and Ag85B, respectively), and to a lesser extent the 19- and 38-kDa proteins, are major antigenic targets for these mycobacterium-specific CD8+ T cells, while whole-M. bovis BCG activated effector cells from these BCG-vaccinated donors, as expected, failed to recognize the 6-kDa ESAT-6 protein. The use of metabolic inhibitors and blocking antibodies revealed that the CD8+ T cells recognize antigen processed and presented via the classical MHC class I pathway. These data suggest that CD8+ T cells may play a critical role in the human immune response to tuberculosis infection.

* Corresponding author. Mailing address: Immunology Unit, Department of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, Keppel St., London, WC1E 7HT, United Kingdom. Phone: 44 (0)171 927 2832. Fax: 44 (0)171 637 4314. E-mail: s.smith{at}lshtm.ac.uk.

Infection and Immunity, October 1999, p. 5223-5230, Vol. 67, No. 10
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Copyright © 1999 by the American Society for Microbiology. All rights reserved.