Toll‐like receptor 4 plays a protective role in pulmonary tuberculosis in mice

• Published in: International immunology 2004-03, Vol.16 (3), p.509-516
• Main Authors: Branger, Judith, Leemans, Jaklien C., Florquin, Sandrine, Weijer, Sebastiaan, Speelman, Peter, van der Poll, Tom
• Format: Article
• Language: English
• Subjects: Animals; Hypersensitivity, Delayed - immunology; Hypersensitivity, Delayed - metabolism; inflammation; innate host defense; Interferon-gamma - immunology; Interferon-gamma - metabolism; Interleukin-4 - immunology; Interleukin-4 - metabolism; Lung - metabolism; Lung - microbiology; Lung - pathology; Macrophages - immunology; Macrophages - metabolism; Membrane Glycoproteins - genetics; Membrane Glycoproteins - metabolism; Membrane Glycoproteins - physiology; Mice; Mice, Mutant Strains; Mycobacterium tuberculosis; Mycobacterium tuberculosis - immunology; Mycobacterium tuberculosis - metabolism; Receptors, Cell Surface - genetics; Receptors, Cell Surface - metabolism; Receptors, Cell Surface - physiology; Spleen - immunology; Spleen - metabolism; T-Lymphocyte Subsets - immunology; T-Lymphocyte Subsets - metabolism; TLR4; Toll-Like Receptor 4; Toll-Like Receptors; Tuberculosis, Pulmonary - immunology; Tuberculosis, Pulmonary - metabolism
• ISSN: 0953-8178; 1460-2377; 1460-2377
• DOI: 10.1093/intimm/dxh052

Toll‐like receptors (TLR) play an essential role in the innate recognition of microorganisms by the host. To determine the role of TLR4 in host defense against lung tuberculosis, TLR4 mutant (C3H/HeJ) and wild‐type (C3H/HeN) mice were intranasally infected with live Mycobacterium tuberculosis. TLR4 mutant mice were more susceptible to pulmonary tuberculosis, as indicated by a reduced survival and an enhanced mycobacterial outgrowth. Lung infiltrates were more profound in TLR4 mutant mice and contained more activated T cells. Splenocytes of infected TLR4 mutant mice demonstrated a reduced capacity to produce the protective type 1 cytokine IFN‐γ upon antigen‐specific stimulation, indicating that TLR4 may be involved in the generation of acquired T cell‐mediated immunity. These data suggest that TLR4 plays a protective role in host defense against lung infection by M. tuberculosis.