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Affects Homing of Diabetogenic T Cells1

*
The Jackson Laboratory, Bar Harbor, ME 04609; and
Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol, Bristol, United Kingdom
IFN-
is a cytokine with pleiotropic functions that participates
in immune and autoimmune responses. The lack of IFN-
is known to
delay the development of autoimmune diabetes in nonobese diabetic (NOD)
mice. Splenocytes from diabetic NOD and IFN-
knockout (KO) NOD mice
transfer diabetes into NOD recipients equally well. However, adoptive
transfer of diabetogenic T cells from NOD mice into NOD.IFN-
-KO or
NOD mice lacking
-chain of IFN-
receptor (NOD.IFN-
R
-KO)
appeared to be much less efficient. We found that IFN-
influences
the ability of diabetogenic cells to penetrate pancreatic islets.
Tracing in vivo of insulin-specific CD8+ T cells has shown
that homing of these cells to the islets of Langerhans was affected by
the lack of IFN-
. While adhesion of insulin-specific
CD8+ cells to microvasculature was normal, the diapedesis
was significantly impaired. This effect was reversible by treatment of
the animals with rIFN-
. Thus, IFN-
may, among other effects,
influence immune and autoimmune responses by supporting the homing of
activated T cells.
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