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Membrane lymphotoxin contributes to anti-leishmanial immunity by controlling structural integrity of lymphoid organs.

Authors: Wilhelm, P  Riminton, DS  Ritter, U  Lemckert, FA  Scheidig, C  Hoek, R  Sedgwick, JD  Korner, H 
Citation: Wilhelm P, etal., Eur J Immunol. 2002 Jul;32(7):1993-2003.
Pubmed: (View Article at PubMed) PMID:12115620
DOI: Full-text: DOI:10.1002/1521-4141(200207)32:7<1993::AID-IMMU1993>3.0.CO;2-F

Lymphotoxin (LT)alpha in combination with LTbeta forms membrane-bound heterotrimeric complexes with a crucial function in lymph node (LN) organogenesis and correct morphogenesis of secondary lymphoid tissue. To study the role of membrane LT (mLT) in lymphoid tissue organogenesis we generated an LTbeta-deficient mouse strain on a pure genetic C57BL/6 background (B6.LTbeta-/-) and compared it to a unique series of LTalpha-, TNF- and TNF/LTalpha-gene-targeted mice on an identical genetic background (B6.LTalpha-/-, B6.TNF-/- and B6 TNF/LTalpha-/-). B6.LTbeta-/- mice lacked peripheral LN with the exception of mesenteric LN, and displayed a disturbed micro-architecture of the spleen, although less profoundly than LTalpha- or TNF/LTalpha-deficient mice. Radiation bone marrow chimeras (B6.WT-->B6.LTbeta-/- developed Peyer's patch (PP)-like lymphoid aggregates in the intestinal wall indicating a possible role for soluble LTalpha(3) in the formation of the PP anlage. After infection with Leishmania major, B6.LTbeta-/- mice developed a fatal disseminating leishmaniasis resulting in death after 8 to 14 weeks, despite the natural resistance of the C57BL/6 genetic background (B6.WT) mice to the parasite. Both, the cellular and the humoral anti-L. major immune responses were delayed and ineffective. However, the expression pattern of the key cytokines IFN-gamma and IL-12 were comparable in B6.WT and B6.LTbeta-/- mice. Infection of radiation bone marrow chimeras showed that it is the LTbeta-dependent presence of lymphoid tissue and not the expression of mLT itself that renders mice resistant to leishmaniasis.

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CRRD Object Information
CRRD ID: 8548822
Created: 2014-03-20
Species: All species
Last Modified: 2014-03-20
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.