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

Ritter, Uwe, Lechner, Anja, Scharl, Katja, Kiafard, Ziba, Zwirner, Jörg, and Korner, Heinrich (2008) TNF controls the infiltration of dendritic cells into the site of Leishmania major infection. Medical Microbiology and Immunology, 197 (1). pp. 29-37.

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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.

Item ID: 6890
Item Type: Article (Research - C1)
ISSN: 1432-1831
Keywords: Leishmania; chemokines; dendritic cells
Date Deposited: 18 Feb 2010 01:29
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1107 Immunology > 110704 Cellular Immunology @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920108 Immune System and Allergy @ 100%
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