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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Olleros, Maria L. Ryffel, Bernhard Keeton, Roanne Vacher, Rachel Jacobs, Muazzam Nedospasov, Sergei A. Vasseur, Virginie Drutskaya, Marina S. Garcia, Irene Fick, Lizette Guler, Reto Allie, Nasiema Abel, Brian Court, Nathalie Quesniaux, Valerie F. J. |
| Description | Country affiliation: South Africa Author Affiliation: Allie N ( Division of Immunology, Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa.) |
| Abstract | The contribution of lymphotoxin (LT) in the host immune response to virulent Mycobacterium tuberculosis and Mycobacterium bovis bacillus Calmette-Guérin infections was investigated. Despite their ability to induce Th1 cytokine, IFN-γ, and IL-12 pulmonary response, 'conventional' LT (-/-) mice succumb rapidly to virulent M. tuberculosis aerosol infection, with uncontrolled bacilli growth, defective granuloma formation, necrosis, and reduced pulmonary inducible NO synthase expression, similar to TNF(-/-) mice. Contributions from developmental lymphoid abnormalities in LT (-/-) mice were excluded because hematopoietic reconstitution with conventional LT (-/-) bone marrow conferred enhanced susceptibility to wild-type mice, comparable to conventional LT (-/-) control mice. However, conventional LT (-/-) mice produced reduced levels of TNF after M. bovis bacillus Calmette-Guérin infection, and their lack of control of mycobacterial infection could be due to a defective contribution of either LT or TNF, or both, to the host immune response. To address this point, the response of 'neo-free' LT (-/-) mice with unperturbed intrinsic TNF expression to M. tuberculosis infection was investigated in a direct comparative study with conventional LT (-/-) mice. Strikingly, although conventional LT (-/-) mice were highly sensitive, similar to TNF(-/-) mice, neo-free LT (-/-) mice controlled acute M. tuberculosis infection essentially as wild-type mice. Pulmonary bacterial burden and inflammation was, however, slightly increased in neo-free LT (-/-) mice 4-5 mo postinfection, but importantly, they did not succumb to infection. Our findings revise the notion that LT might have a critical role in host defense to acute mycobacterial infection, independent of TNF, but suggest a contribution of LT in the control of chronic M. tuberculosis infection. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| Journal | The Journal of Immunology |
| Issue Number | 7 |
| Volume Number | 185 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2010-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Lymphotoxin-alpha Immunology Tuberculosis Animals Cytokines Biosynthesis Enzyme-linked Immunosorbent Assay Metabolism Mice Mice, Inbred C57bl Mice, Knockout Mycobacterium Bovis Mycobacterium Tuberculosis Nitric Oxide Synthase Type Ii Tumor Necrosis Factor-alpha Research Support, Non-u.s. Gov't Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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