TNF controls the infiltration of dendritic cells into the site of Leishmania major infection

• Published in: Medical microbiology and immunology 2008-03, Vol.197 (1), p.29-37
• Main Authors: Ritter, Uwe, Lechner, Anja, Scharl, Katja, Kiafard, Ziba, Zwirner, Jörg, Körner, Heinrich
• Format: Article
• Language: English
• Subjects: Animals; Antibodies, Monoclonal - immunology; Biological and medical sciences; Biomedical and Life Sciences; Biomedicine; CD11c Antigen - analysis; Cell Movement - immunology; Chemokine CCL21 - immunology; Cytokines; Dendritic Cells - immunology; Flow Cytometry; Foot; Fundamental and applied biological sciences. Psychology; Immunity, Cellular; Immunology; Infections; Inflammation - immunology; Interferon-gamma - immunology; Leishmania major; Leishmania major - immunology; Leishmaniasis, Cutaneous - immunology; Leukocyte Common Antigens - analysis; Leukocytes - immunology; Life cycle. Host-agent relationship. Pathogenesis; Lymph Nodes - cytology; Lymph Nodes - immunology; Medical Microbiology; Medical research; Mice; Mice, Inbred C57BL; Microbiology; Microscopy, Fluorescence; Original Investigation; Parasites; Protozoa; Rodents; Skin - immunology; Tumor Necrosis Factor-alpha - immunology; Virology
• ISSN: 0300-8584; 1432-1831
• DOI: 10.1007/s00430-007-0056-z

TNF-negative C57BL/6 (B6.TNF −/− ) mice are highly susceptible to Leishmania ( L .) major infection and succumb rapidly to fatal leishmaniasis . A T helper type 1 (Th1) cell-mediated immune response is central for protective anti-leishmanial immunity. Therefore, the observed susceptibility of B6.TNF −/− mice to L. major parasites could be caused by a deficiency in mounting a Th1 response. Analysis of infected footpads revealed, that B6.TNF −/− mice exhibited a substantially diminished formation of DCs at the site of infection. Furthermore, Th1 cytokines such as IFN-γ were reduced in footpads of infected B6.TNF −/− mice. Cutaneous reconstitution of B6.TNF −/− mice with either bone marrow derived DCs (BM-DCs) or recombinant TNF simultaneous to infection resulted in an increased expression of cytokines such as IFN-γ and in an enhanced presence of Leishmania -antigen in skin draining lymph nodes. In addition, the individual time of survival was doubled. In conclusion we demonstrate that the expression of dermal TNF is necessary to provide an environment that initiates a local inflammatory response, but is not sufficient to induce protective immunity.