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Eß7 Prevents and Ameliorates Immunization-Induced Colitis in IL-2-/- Mice

*
Mucosal Immunity Section, Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, and
Protein Design Laboratories, Inc., Mountain View, CA 94043
We previously demonstrated that 2,4,6-trinitrophenol (TNP)-OVA
immunization leads to a transmural colitis in the IL-2-/-
mouse that is caused by IL-12-driven CD4+ Th1 T cells and
resembles human Crohns disease. The integrin
Eß7 is highly expressed on colonic
intraepithelial lymphocytes and has been suggested to function as a
homing or retention molecule for intraepithelial lymphocytes. To
evaluate the role of
Eß7 in colitis, we
administered a mAb against
Eß7 to
IL-2-/- mice that were immunized at the same time with
TNP-OVA in CFA. To our surprise, this treatment resulted in a
significantly reduced colitis severity score, 02 vs 34, that was
associated with a significant reduction in CD4+ lamina
propria lymphocyte subpopulation (p < 0.01). In
contrast, the total number of splenic CD4+ T cells of
treated animals was significantly elevated compared with that of
untreated animals (3.2 ± 0.6 x 107 vs 1.2
± 0.2 x 107; p < 0.05).
Similarly, functional studies revealed that IFN-
production by
lamina propria lymphocytes isolated from IL-2-/-
TNP-OVA-immunized mice treated with
anti-
Eß7 was significantly lower than
in untreated IL-2-/- TNP-OVA-immunized mice. In contrast,
IFN-
production by splenic cells isolated from treated
IL-2-/- TNP-OVA-immunized mice was significantly higher
than in untreated mice. Finally, TNP-OVA-immunized
IL-2-/- mice that were treated after the colitis had been
established also showed a significant decrease in mucosal inflammation
after
Eß7 mAb administration. Thus, the
above findings demonstrate that the onset and maintenance of
inflammatory bowel disease depends on the colonic localization of
lamina propria CD4+ lymphocytes expressing
Eß7.
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