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Infect. Immun., Aug 1997, 3126-3131, Vol 65, No. 8
RJ Cahill, CJ Foltz, JG Fox, CA Dangler, F Powrie and DB Schauer
Inflammatory bowel disease (IBD) is thought to result from either an
abnormal immunological response to enteric flora or a normal immunological
response to a specific pathogen. No study to date has combined both
factors. The present studies were carried out with an immunologically
manipulated mouse model of IBD. Mice homozygous for the severe combined
immunodeficiency (scid) mutation develop IBD with adoptive transfer of CD4+
T cells expressing high levels of CD45RB (CD45RB(high) CD4+ T cells). These
mice do not develop IBD in germfree conditions, implicating undefined
intestinal flora in the pathogenesis of lesions. In controlled duplicate
studies, the influence of a single murine pathogen, Helicobacter hepaticus,
in combination with the abnormal immunological response on the development
of IBD was assessed. The combination of H. hepaticus infection and
CD45RB(high) CD4+ T-cell reconstitution resulted in severe disease
expression similar to that observed in human IBD. This study demonstrates
that IBD develops in mice as a consequence of an abnormal immune response
in the presence of a single murine pathogen, H. hepaticus. The interaction
of host immunity and a single pathogen in this murine system provides a
novel model of human IBD, an immunity-mediated condition triggered by
bacterial infection.
Copyright © 1997, American Society for Microbiology
Inflammatory bowel disease: an immunity-mediated condition triggered by bacterial infection with Helicobacter hepaticus
Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge 03129, USA.
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