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J. Exp. Med.,
Volume 187, Number 3, February 2, 1998 427-432
By

From the * Institut de Génétique et de Biologie Moléculaire et Cellulaire (CNRS/INSERM/ULP),
1 rue Laurent Fries, 67404 Illkirch, Communanté Urbain de Strasbourg, France; and the Evidence has been accumulating that shows that insulin-dependent diabetes is subject to immunoregulation. To determine whether cytotoxic T lymphocyte-associated antigen 4 (CTLA-4)
is involved, we injected anti-CTLA-4 mAb into a TCR transgenic model of diabetes at different stages of disease. When injected into young mice, months before they would normally become diabetic, anti-CTLA-4 induced diabetes rapidly and essentially universally; this was not
the result of a global activation of T lymphocytes, but did reflect a much more aggressive T cell
infiltrate in the pancreatic islets. These effects were only observed if anti-CTLA-4 was injected during a narrow time window, before the initiation of insulitis. Thus, engagement of CTLA-4
at the time when potentially diabetogenic T cells are first activated is a pivotal event; if engagement is permitted, invasion of the islets occurs, but remains quite innocuous for months, if not,
insulitis is much more aggressive, and diabetes quickly ensues.
Howard Hughes
Medical Institute, Cancer Research Laboratory, University of California, Berkeley, California 94720-0001
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