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Acute Rejection of White Adipose Tissue Allograft

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White adipose tissue (WAT) transplantation, although widely used in humans, has been done for cosmetic and reconstructive purposes only. Accumulating evidence indicates, however, that WAT is an important endocrine organ and, therefore, WAT transplantation may become valuable as a replacement therapy for a number of hereditary human diseases. Because the most readily available source for such transplantations would be allogeneic tissue, the mechanisms involved in the rejection of WAT allograft should be explored. We have established a model in which leptin-producing allogeneic WAT is transplanted into leptin-deficient ob/ob mice. Because ob/ob mice are obese, hyperphagic, and hypothermic, WAT allograft function is monitored as the reversal of this leptin-deficient phenotype. Here we report that allografted WAT is primarily nonfunctional. However, when WAT is transplanted into immunodeficient (Rag1−/−) ob/ob mice, or into ob/ob mice depleted of T cells by anti-CD3 antibody, a long-term graft survival is achieved as indicated by the reversal of hyperphagia, weight loss, and normalization of body temperature. The symptoms of leptin deficiency rapidly recur when normal spleen cells of the recipient type are injected, or when the antibody treatment is terminated. In contrast, selective depletion of either CD4+ or CD8+ cells alone does not prevent WAT allograft rejection. Similarly, WAT allografts that do not express MHC class I or class II molecules are rapidly rejected, suggesting that both CD4+ and CD8+ T cells may independently mediate WAT allograft rejection.
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Keywords: Allograft; Rejection; T cells; White adipose tissue

Document Type: Research Article

Affiliations: 1: Obesity Research Center, St. Luke's Hospital, New York, NY, USA, Department of Medicine, Columbia University, New York, NY, USA 2: Obesity Research Center, St. Luke's Hospital, New York, NY, USA, Cornell University, Ithaca, NY, USA 3: Department of Pathology, Roosevelt Hospital, New York, NY, USA

Publication date: 2007-04-01

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  • Cell Transplantation publishes original, peer-reviewed research and review articles on the subject of cell transplantation and its application to human diseases. To ensure high-quality contributions from all areas of transplantation, separate section editors and editorial boards have been established. Articles deal with a wide range of topics including physiological, medical, preclinical, tissue engineering, and device-oriented aspects of transplantation of nervous system, endocrine, growth factor-secreting, bone marrow, epithelial, endothelial, and genetically engineered cells, among others. Basic clinical studies and immunological research papers are also featured. To provide complete coverage of this revolutionary field, Cell Transplantation will report on relevant technological advances, and ethical and regulatory considerations of cell transplants. Cell Transplantation is now an Open Access journal starting with volume 18 in 2009, and therefore there will be an inexpensive publication charge, which is dependent on the number of pages, in addition to the charge for color figures. This will allow work to be disseminated to a wider audience and also entitle the corresponding author to a free PDF, as well as prepublication of an unedited version of the manuscript.

    Cell Transplantation is now being published by SAGE. Please visit their website for the most recent issues.

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