International Immunology, Vol 9, 1355-1365, Copyright © 1997 by Oxford University Press
KM Smith, DC Olson, R Hirose and D Hanahan
We report the initial characterization of rare cells within the thymus that
express 'peripheral' self-antigens and are capable of inducing partial
tolerance to a model protein. Mice from two transgenic families that
express SV40 T antigen (Tag) in pancreatic islet beta cells under control
of a rat insulin promoter (RIP) develop T cell tolerance toward this
neo-self antigen. These mice express low levels of Tag mRNA in the thymus.
Transplantation of thymus from tolerant RIP-Tag mice into athymic hosts is
sufficient to confer tolerance by CD4+ Th cells and elicits variable
tolerance by CD8+ cytotoxic T cells. Thymic medulla is shown to contain
rare cells that express the endogenous insulin and somatostatin genes, and
in the transgenic animals, Tag. These cells are referred to as 'peripheral
antigen-expressing' (PAE) cells. Thymic cell fractionation reveals the PAE
cells expressing insulin and Tag to be present in a fraction enriched for
non-lymphoid, MHC class II+ cells. Notably, absence of thymic expression of
the RIP-Tag gene in another transgenic family correlates with failure to
establish self-tolerance and susceptibility to autoimmunity. Thus,
expression of tissue- restricted genes such as insulin in PAE cells of
thymic medulla may serve to limit development of potentially autoimmune T
cells.
ARTICLES
Pancreatic gene expression in rare cells of thymic medulla: evidence for functional contribution to T cell tolerance
Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0534, USA.
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