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Division of Developmental Immunology, La Jolla Institute for Allergy and Immunology, San Diego, California 92121
Inflammatory
bowel disease (IBD) is a multifactorial immune disorder of uncertain
etiology. The advent of several mouse models of mucosal inflammation
that resemble IBD has provided insight into the mechanisms governing
both normal and pathological mucosal immune function. In a widely used
adoptive transfer model, the injection into immunodeficient mice of a
subset of CD4+ T lymphocytes, the
CD4+CD45RBhigh
cells, leads to inflammation of the intestine. Pathogenesis is due in
part to the secretion of proinflammatory cytokines. The induction of
colitis can be prevented by cotransfer of another CD4+ subpopulation, the
CD4+CD45RBlow
T cells. This population behaves analogously to the
CD4+CD45RBhigh
population in terms of the acquisition of activation markers and homing
to the host intestine. However, their lymphokine profile when activated
is different, and anti-inflammatory cytokines secreted and/or induced
by
CD4+CD45RBlow
T cells prevent colitis. In this themes article, a description of the
adoptive transfer model is given, the factors that promote and prevent
colitis pathogenesis are discussed, and some controversial aspects of
the model are addressed.
adoptive transfer; immunodeficient mice; inflammatory bowel disease; CD4+CD45RBhigh cells
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