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Brief Definitive Reports |
deficient Mice Leads to Exacerbation of Experimental Autoimmune Encephalomyelitis
Correspondence to: Dyana K. Dalton, The Trudeau Institute, 100 Algonquin Ave., P.O. Box 59, Saranac Lake, NY 12983. Tel:518-891-3080 ext. 168 Fax:518-891-5126 E-mail:ddalton{at}trudeauinstitute.org.
Mice deficient in interferon (IFN)-
or IFN-
receptor develop progressive and fatal experimental autoimmune encephalomyelitis (EAE). We demonstrate that CD4 T cells lacking IFN-
production were required to passively transfer EAE, indicating that they were disease-mediating cells in IFN-
knockout (KO) mice. IFN-
KO mice accumulated 1016-fold more activated CD4 T cells (CD4+CD44hi) than wild-type mice in the central nervous system during EAE. CD4+CD44hi T cells in the spleen and central nervous system of IFN-
KO mice during EAE showed markedly increased in vivo proliferation and significantly decreased ex vivo apoptosis compared with those of wild-type mice. IFN-
KO CD4+CD44hi T cells proliferated extensively to antigen restimulation in vitro and accumulated larger numbers of live CD4+ CD44hi T cells. IFN-
completely suppressed proliferation and significantly induced apoptosis of CD4+CD44hi T cells responding to antigen and hence inhibited accumulation of live, activated CD4 T cells. We thus present novel in vivo and in vitro evidence that IFN-
may limit the extent of EAE by suppressing expansion of activated CD4 T cells.
Key Words: T lymphocytes, apoptosis, autoimmune diseases, animal disease models, knockout mice
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