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Liver-Derived Dendritic Cells Induce Donor-Specific Hyporesponsiveness: Use of Sponge Implant as a Cell Transplant Model

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Spontaneously accepted mouse liver allografts are capable of protecting subsequently transplanted donor organs from rejection; however, the underlying mechanisms are unclear. Dendritic cells (DC) residing in liver grafts are likely important in tolerance induction. DC propagated from mouse liver with GM-CSF are phenotypically and functionally immature. They are poor allostimulators in MLR and prolong survival of pancreatic islet allografts. It has been problematic to perform mechanistic studies in an islet transplant model because of difficulties in obtaining sufficient graft infiltrating cells. In this study, we used a sponge allograft model [i.e., a subcutaneously implanted sponge matrix loaded with B10 (H2b) spleen cells]. To investigate the influence of administration of donor (B10) liver-derived DC on alloimmune reactivity of C3H (H2k) hosts, sponge graft infiltrating cells (SGIC) and recipient spleen cells were isolated, and their immunophenotype and donor-specific cytotoxic T lymphocyte (CTL) activity were examined. The results illustrate that donor-specific CTL activity of T cells are lower in recipients that had received systemic treatment with liver-derived immature DC, associated with a decrease in CD8+ cell population and an increase in Gr-1+ cells in SGIC, compared with recipients treated with mature bone marrow (BM)-derived DC. Interestingly, administration of liver DC directly into the sponge did not inhibit T cell responses. These data suggest that systemic administration of donor liver DC induces donor-specific hyporesponsiveness, probably not by direct inhibition of graft infiltrating T cells. The increased Gr-1+ cells may play immune regulatory roles in induction of host donor-specific hyporesponsiveness.

Keywords: Cell transplant;; Key words: Dendritic cell; Liver

Document Type: Research Article


Affiliations: Thomas E. Starzl Transplantation Institute and Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA 152123

Publication date: 2001-03-01

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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.
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