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+ T Cells1
Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, WI 53226
C57BL/6 (B6) mice with targeted mutations of immune function genes
were used to investigate the mechanism of recovery from experimental
autoimmune encephalomyelitis (EAE). The acute phase of passive EAE in
the B6 mouse is normally resolved by partial recovery followed by mild
sporadic relapses. B6 TCR
-chain knockout (KO) recipients of a
myelin oligodendrocyte glycoprotein p3555 encephalitogenic T cell
line failed to recover from the acute phase of passive EAE. In
comparison with wild-type mice, active disease was more severe in
2-microglobulin KO mice. Reconstitution of TCR
-chain
KO mice with wild-type spleen cells halted progression of disease and
favored recovery. Spleen cells from T cell-deficient mice, IL-7R KO
mice, or IFN-
KO mice were ineffective in this regard. Irradiation
or treatment of wild-type spleen cell population with anti-NK1.1
mAb before transfer abrogated the protective effect. Removal of
DX5+ cells from wild-type spleen cells by anti-DX5
Ab-coated magnetic beads before reconstitution abrogated the
suppressive properties of the spleen cells. TCR-deficient recipients of
the enriched DX5+ cell population recovered normally from
passively induced acute disease. DX5+ cells were sorted by
FACS into DX5+ 
TCR+ and DX5+

TCR- populations. Only recipients of the former
recovered normally from clinical disease. These results indicate that
recovery from acute EAE is an active process that requires
NK1.1+, DX5+ 
+ TCR spleen
cells and IFN-
.
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