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Local expression of B7-H1 promotes organ-specific autoimmunity and transplant rejection.
- Source :
-
Journal of Clinical Investigation . Mar2004, Vol. 113 Issue 5, p694-700. 7p. 1 Diagram, 4 Graphs. - Publication Year :
- 2004
-
Abstract
- A number of studies have suggested B7-H1, a B7 family member, inhibits T cell responses. Therefore, its expression on nonlymphoid tissues has been proposed to prevent T cell-mediated tissue destruction. To test this hypothesis, we generated transgenic mice that expressed B7-H1 on pancreatic islet β cells. Surprisingly, we observed accelerated rejection of transplanted allogeneic B7-Hl-expressing islet β cells. Furthermore, transgenic B7-H1 expression broke immune tolerance, as some of the mice spontaneously developed T cell-dependent autoimmune diabetes. In addition, B7-H1 expression increased CD8T cell proliferation and promoted autoimmunity induction in a T cell adoptive transfer model of diabetes. Consistent with these findings, B7-HI.Ig fusion protein augmented naive T cell priming both in vitro and in vivo. Our results demonstrate that BT-H1 can provide positive costimulation for naive T cells to promote allograft rejection and autoimmune disease pathogenesis. [ABSTRACT FROM AUTHOR]
- Subjects :
- *T cells
*AUTOIMMUNE diseases
*DIABETES
*TISSUES
*CELL proliferation
Subjects
Details
- Language :
- English
- ISSN :
- 00219738
- Volume :
- 113
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of Clinical Investigation
- Publication Type :
- Academic Journal
- Accession number :
- 12460785
- Full Text :
- https://doi.org/10.1172/JCI200419210