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Departments of 1 Comparative Medicine and 2 Molecular Biotechnology, University of Washington, Seattle 98195; 3 Corixa Corporation, Seattle 98104; 4 Zymogenetics Incorporated, Seattle 98102; and 5 Department of Molecular Immunology, Immunex Corporation, Seattle, Washington 98101
Inflammatory bowel disease (IBD) is
thought to result from a dysregulated mucosal immune response to
luminal microbial antigens, with T lymphocytes mediating the colonic
pathology. Infection with Helicobacter spp has been reported
to cause IBD in immunodeficient mice, some of which lack T lymphocytes.
To further understand the role of T cells and microbial antigens in
triggering IBD, we infected interleukin (IL)-10
/
,
recombinase-activating gene (Rag)1
/
,
T-cell receptor (TCR)-
/
, TCR-
/
,
and wild-type mice with Helicobacter hepaticus or
Helicobacter bilis and compared the histopathological IBD
phenotype. IL-10
/
mice developed severe diffuse IBD
with either H. bilis or H. hepaticus, whereas
Rag1
/
, TCR-
/
,
TCR-
/
, and wild-type mice showed different
susceptibilities to Helicobacter spp infection.
Proinflammatory cytokine mRNA expression was increased in the colons of
Helicobacter-infected IL-10
/
and
TCR-
/
mice with IBD. These results confirm and
extend the role of Helicobacter as a useful tool for
investigating microbial-induced IBD and show the importance, but not
strict dependence, of T cells in the development of bacterial-induced IBD.
Helicobacter bilis; Helicobacter hepaticus; colitis; proinflammatory cytokines
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