The Journal of Experimental Medicine
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Published 17 November 2003. doi:10.1084/jem.20030966
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© Rockefeller University Press, 0022-1007/2003/11/1527 $5.00
The Journal of Experimental Medicine, Volume 198, Number 10, 1527-1537

Physiological ß Cell Death Triggers Priming of Self-reactive T Cells by Dendritic Cells in a Type-1 Diabetes Model

Shannon Turley1, Laurent Poirot1, Masakazu Hattori1, Christophe Benoist1 and Diane Mathis1,2

1 Section of Immunology and Immunogenetics, Joslin Diabetes Center
2 Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02215

Address correspondence to Diane Mathis or Christophe Benoist, Section of Immunology and Immunogenetics, Joslin Diabetes Center and Dept. of Medicine, Brigham and Women's Hospital, Harvard Medical School, One Joslin Pl., Boston, MA 02215. Phone: (617) 264-2745; Fax: (617) 264-2744; email: cbdm{at}joslin.harvard.edu

The prelude to type-1 diabetes is leukocyte infiltration into the pancreatic islets, or insulitis. This process begins in pancreatic lymph nodes when T lymphocytes reactive to islet ß cells encounter antigen-presenting cells (APCs) displaying peptides derived from ß cell proteins. We show here that a ripple of physiological ß cell death, which occurs at 2 wk of age in all mouse strains, precipitates the arrival of such APCs, and that the relevant APC is a dendritic cell of CD11c+CD11b+CD8{alpha}- phenotype. These findings have significant implications concerning the nature of the diabetes-provoking deficits in NOD mice, the identity of the primordial diabetogenic antigens, and our understanding of the balance between immunity and tolerance in a pathological context.

Key Words: autoimmune response • pancreas • PLN • antigen transport • apoptosis


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