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The Journal of Immunology, 1998, 161: 4646-4651.
Copyright © 1998 by The American Association of Immunologists

Role of T Cells and Germinal Center Formation in the Generation of Immune Responses to the Thymus-Independent Carbohydrate Dextran B5121

Eva Sverremark2 and Carmen Fernandez

Department of Immunology, The Wenner-Gren Institute, Arrhenius Laboratories for Natural Sciences, Stockholm University, Stockholm, Sweden

Immunization with the thymus-independent (TI) Ag native dextran (DX) B512 induces germinal center (GC) formation in the spleen. However, despite this GC formation, the anti-DX response is poor, and no affinity maturation can be observed. Using cholera toxin (CT) as an adjuvant, splenic as well as humoral responses to DX are improved. In this study, we investigated immune responses against DX in mice lacking TNF receptor I and in athymic mice. The adjuvant effect of CT on these responses was also evaluated. Mice lacking the TNF receptor I allowed us to investigate the role of follicular dendritic cell networks and GC formation in the spleen for the generation of Ab responses to DX, whereas we could investigate the role of T cells in GC development to TI Ags using athymic mice. We found that the humoral immune response to TI DX B512 was not dependent upon T cells or the presence of GCs, although GC development occurred after DX immunization. However, T cells were required for this GC formation, since athymic mice could not develop GCs after immunization with DX. We also show that even if CT is able to directly activate B cells when administered as an adjuvant, the major effect may require T cell participation; this is also the case for TI Ags. In contrast, CT adjuvancy is independent of GC formation.




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