The Journal of Experimental Medicine
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J. Exp. Med., Volume 189, Number 1, January 4, 1999 159-168

Mature Follicular Dendritic Cell Networks Depend on Expression of Lymphotoxin beta  Receptor by Radioresistant Stromal Cells and of Lymphotoxin beta  and Tumor Necrosis Factor by B Cells

By Robert Endres,* Marat B. Alimzhanov,Dagger Thomas Plitz,* Agnes Fütterer,* Marie H. Kosco-Vilbois,§ Sergei A. Nedospasov,parallel Klaus Rajewsky,Dagger and Klaus Pfeffer*

From the * Institute of Medical Microbiology, Immunology and Hygiene, Technical University of Munich, D-81675 Munich, Germany; the Dagger  Institute for Genetics, University of Cologne, D-50931 Cologne, Germany; § Serono Pharmaceutical Research Institute, Plan-les-Ouates, CH-1228, Switzerland; and the parallel  Engelhardt Institute of Molecular Biology and Belozersky Institute of Physico-Chemical Biology, 117984 Moscow, Russia

The formation of germinal centers (GCs) represents a crucial step in the humoral immune response. Recent studies using gene-targeted mice have revealed that the cytokines tumor necrosis factor (TNF), lymphotoxin (LT) alpha , and LTbeta , as well as their receptors TNF receptor p55 (TNFRp55) and LTbeta R play essential roles in the development of GCs. To establish in which cell types expression of LTbeta R, LTbeta , and TNF is required for GC formation, LTbeta R-/-, LTbeta -/-, TNF-/-, B cell-deficient (BCR-/-), and wild-type mice were used to generate reciprocal or mixed bone marrow (BM) chimeric mice. GCs, herein defined as peanut agglutinin-binding (PNA+) clusters of centroblasts/centrocytes in association with follicular dendritic cell (FDC) networks, were not detectable in LTbeta R-/- hosts after transfer of wild-type BM. In contrast, the GC reaction was restored in LTbeta -/- hosts reconstituted with either wild-type or LTbeta R-/- BM. In BCR-/- recipients reconstituted with compound LTbeta -/-/BCR-/- or TNF-/-/BCR-/- BM grafts, PNA+ cell clusters formed in splenic follicles, but associated FDC networks were strongly reduced or absent. Thus, development of splenic FDC networks depends on expression of LTbeta and TNF by B lymphocytes and LTbeta R by radioresistant stromal cells.

Key words: lymphotoxintumor necrosis factorbone marrow transferfollicular dendritic cellgerminal center


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