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(American Journal of Pathology. 2005;166:1109-1120.)
© 2005 American Society for Investigative Pathology

Contribution of Transmembrane Tumor Necrosis Factor to Host Defense against Mycobacterium bovis Bacillus Calmette-Guerin and Mycobacterium tuberculosis Infections

Maria L. Olleros^*, Reto Guler^*, Dominique Vesin^*, Roumen Parapanov^*, Gilles Marchal, Eduardo Martinez-Soria^*, Nadia Corazza, Jean-Claude Pache^*, Christoph Mueller and Irene Garcia^*

From the Department of Pathology and Immunology,^* University of Geneva, Geneva, Switzerland; the Department of Pathology, University of Bern, Bern, Switzerland; and the Laboratoire du Bacillus Calmette-Guerin and Unité de Physiopathologie de l’Infection, Institut Pasteur, Paris, France

To study the specific role of transmembrane tumor necrosis factor (TmTNF) in host defense mechanisms against bacillus Calmette-Guerin (BCG) and Mycobacterium tuberculosis infections, we compared the immune responses of TNF/lymphotoxin (LT)-^–/– mice expressing a noncleavable transgenic TmTNF (TmTNF tg) to those of TNF/LT-^–/– and wild-type mice. Susceptibility of TNF/LT-^–/– mice to BCG infection was associated with impaired induction of systemic RANTES but not of monocyte chemoattractant protein 1 (MCP-1), the development of excessive local and systemic Th1-type immune responses, and a substantially reduced inducible nitric oxide synthase (iNOS) activity. Resistance of TmTNF tg mice to BCG infection was associated with efficient activation of iNOS in granulomas and with the regulated release of local and systemic chemokines and Th1-type cytokines. However, M. tuberculosis infection of TmTNF tg mice resulted in longer survival and enhanced resistance compared to TNF/LT-^–/– mice but higher sensitivity than wild-type mice. TmTNF tg mice exhibited reduced pulmonary iNOS expression and showed an exacerbated cellular infiltration in the lungs despite a modest bacillary content. Our data thus indicate a role for TmTNF in host defense against mycobacteria by contributing to induction and regulation of Th1-type cytokine and chemokine expression leading to development of bactericidal granulomas expressing iNOS, which critically determines susceptibility versus resistance of the host to mycobacterial infections.

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