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J. Exp. Med.,
Volume 189, Number 5, March 1, 1999 877-882
By
From the Medical Research Council Cellular Immunology Unit, Sir William Dunn School of
Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
Previous studies have shown that autoimmune thyroiditis can be induced in normal laboratory
rats after thymectomy and split dose
-irradiation. Development of disease can be prevented
by reconstitution of PVG rats shortly after their final irradiation with either peripheral
CD4+CD45RC
T cells or CD4+CD8
thymocytes from syngeneic donors. Although the activity of both populations is known to depend on the activities of endogenously produced interleukin 4 and transforming growth factor
, implying a common mechanism, the issue of antigen specificity of the cells involved has not yet been addressed. In this study, we show that the
regulatory T cells that prevent autoimmune thyroiditis are generated in vivo only when the
relevant autoantigen is also present. Peripheral CD4+ T cells, from rats whose thyroids were
ablated in utero by treatment with 131I, were unable to prevent disease development upon
adoptive transfer into thymectomized and irradiated recipients. This regulatory deficit is specific for thyroid autoimmunity, since CD4+ T cells from 131I-treated PVG.RT1u rats were as
effective as those from normal donors at preventing diabetes in thymectomized and irradiated
PVG.RT1u rats. Significantly, in contrast to the peripheral CD4+ T cells, CD4+CD8
thymocytes from 131I-treated PVG donors were still able to prevent thyroiditis upon adoptive
transfer. Taken together, these data indicate that it is the peripheral autoantigen itself that stimulates the generation of the appropriate regulatory cells from thymic emigrant precursors.
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