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J. Exp. Med.,
Volume 186, Number 10, November 17, 1997 1749-1756
Mutant Mice
By
From the Immunopathology Unit, Massachusetts General Hospital and Harvard Medical School,
Boston, MA 02114
The role of antibodies (Abs) in the development of chronic colitis in T cell receptor (TCR)-
/
mice was explored by creating double mutant mice (TCR-
/
× immunoglobulin (Ig)µ
/
),
which lack B cells. TCR-
/
× Igµ
/
mice spontaneously developed colitis at an earlier age,
and the colitis was more severe than in TCR-
/
mice. Colitis was induced in recombination-activating gene-1 (RAG-1
/
) mice by the transfer of mesenteric lymph node (MLN) cells
from TCR-
/
× Igµ
/
mice. When purified B cells from TCR-
/
mice were mixed
with MLN cells before cell transfer, colitis did not develop in RAG-1
/
mice. Administration
of the purified Ig from TCR-
/
mice and a mixture of monoclonal autoAbs reactive with
colonic epithelial cells led to attenuation of colitis in TCR-
/
× Igµ
/
mice. Apoptotic
cells were increased in the colon, MLN, and spleen of TCR-
/
× Igµ
/
mice as compared
to Igµ
/
mice and TCR-
/
mice. Administration of the purified Ig from TCR-
/
mice
into TCR-
/
× Igµ
/
mice led to decrease in the number of apoptotic cells. These findings suggest that although B cells are not required for the initiation of colitis, B cells and Igs
(autoAbs) can suppress colitis, presumably by affecting the clearance of apoptotic cells.
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