Journal
JOURNAL OF IMMUNOLOGY
Volume 165, Issue 1, Pages 353-363Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.165.1.353
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Funding
- NCI NIH HHS [T32 CA82084] Funding Source: Medline
- NIAID NIH HHS [AI37859] Funding Source: Medline
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CD8(+) T lymphocytes have been implicated in the protective immune response against human and murine tuberculosis. However, the functional role that this cell subset plays during the resolution of infection remains controversial. In this study, we demonstrate the presence of Mycobacterium tuberculosis-specific CD8+ CTL in the lungs and lung-draining lymph nodes of mice infected with dl. tuberculosis via the aerosol or i.v. route. These cells expressed perforin in vivo and specifically recognized and lysed M. tuberculosis-infected macrophages in a perforin-dependent manner after a short period of in vitro restimulation. The efficiency of lysis of infected macrophages was dependent upon the time allowed for interaction between macrophage and M, tuberculosis bacilli. Recognition of infected targets by CD8(+) CTL was beta(2)-microglobulin and MHC class I dependent and was not CD1d restricted. The presented data indicate that CD8(+) T cells contribute to the protective immune response during M. tuberculosis infection by exerting cytotoxic function and lysing infected macrophages.
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