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*
The Hospital For Sick Children,
St. Michaels Hospital, University of Toronto,
Sunnybrook and Womens College Health Sciences Center, University of Toronto, Ontario, Canada; and
§
Childrens Hospital of Pittsburgh, Pittsburgh, PA 15219
Type I diabetes and multiple sclerosis (MS) are distinct autoimmune
diseases where T cells target either islet or CNS self-proteins.
Unexpectedly, we found that autoreactive T cells in diabetic patients,
relatives with high diabetes risk, nonobese diabetic (NOD) mice, and MS
patients routinely target classical islet as well as CNS autoantigens.
The pathogenic potential of CNS autoreactivity was testable in NOD
mice. Pertussis holotoxin, without additional Ags or adjuvants, allowed
development of an NOD mouse-specific, autoimmune encephalitis with
variable primary-progressive, monophasic, and relapsing-remitting
courses. T cells from diabetic donors transferred CNS disease to
pertussis toxin-pretreated NOD.scid mice, with accumulation of
CD3/IFN-
transcripts in the brain. Diabetes and MS appear more
closely related than previously perceived. NOD mouse-specific,
autoimmune encephalitis provides a new MS model to identify factors
that determine alternative disease outcomes in hosts with similar
autoreactive T cell repertoires.
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