Abstract
Secondary lymphoid organs (the spleen, lymph nodes and mucosal lymphoid tissues) provide the proper environment for antigen-presenting cells to interact with and activate naive T and B lymphocytes1. Although it is generally accepted that secondary lymphoid organs are essential for initiating immune responses to microbial antigens and to skin allografts2,3,4,5,6, the prevailing view has been that the immune response to primarily vascularized organ transplants such as hearts and kidneys does not require the presence of secondary lymphoid tissue. The assumption has been that the immune response to such organs is initiated in the graft itself when recipient lymphocytes encounter foreign histocompatibility antigens presented by the graft's endothelial cells7,8,9,10,11,12,13. In contrast to this view, we show here that cardiac allografts are accepted indefinitely in recipient mice that lack secondary lymphoid tissue, indicating that the alloimmune response to a vascularized organ transplant cannot be initiated in the graft itself. Moreover, we demonstrate that the permanent acceptance of these grafts is not due to tolerance but is because of immunologic ‘ignorance’.
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Acknowledgements
We thank F.K. Baddoura for the histopathologic analyses and C.P. Larsen, R. Ahmed, D. Briscoe and J. S. Pober for discussions. This work was supported by National Institutes of Health grants AI41643 (F.G.L.) and AI44644 (F.G.L.), and by the Carlos and Marguerite Mason Foundation.
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Lakkis, F., Arakelov, A., Konieczny, B. et al. Immunologic ‘ignorance’ of vascularized organ transplants in the absence of secondary lymphoid tissue. Nat Med 6, 686–688 (2000). https://doi.org/10.1038/76267
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DOI: https://doi.org/10.1038/76267
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