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1996-02-26
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Document 0641
DOCN M9620641
TI Evidence that CD4+, but not CD8+ T cells are responsible for murine
interleukin-2-deficient colitis.
DT 9602
AU Simpson SJ; Mizoguchi E; Allen D; Bhan AK; Terhorst C; Division of
Immunology Beth Israel Hospital, Harvard Medical; School, Boston, MA
02215, USA.
SO Eur J Immunol. 1995 Sep;25(9):2618-25. Unique Identifier : AIDSLINE
MED/96011876
AB Mice deficient in interleukin-2 production (IL-2null mice) develop
colonic inflammation closely resembling ulcerative colitis in humans.
Although this disease is marked by substantial infiltration of the colon
by CD8+ and CD4+ T lymphocytes, no function has yet been assigned to
these T cell subsets in the development of colitis in the IL-2null
mouse. For the present study, we investigated the involvement of T
lymphocytes in the onset of colitis in IL-2null mice, and examined the
possible role played by cytotoxic T cells. Both lamina propria
lymphocytes (LPL) and intraepithelial lymphocytes (IEL) of the colon of
IL-2null mice were potently cytotoxic ex vivo in short-term redirected
cytotoxic lymphocyte (CTL) assays. In contrast, colonic T cells of
wild-type animals showed little or no constitutive cytotoxic T cell
activity. Colonic CTL were detectable prior to the appearance of disease
in IL-2null animals and CTL activity was confined to the TcR alpha beta,
rather than to the TcR gamma delta IEL subset. IL-2null animals crossed
with major histocompatibility complex class I-deficient mice [IL-2null x
beta 2 microglobulin (beta 2mnull) mice] also developed colitis, which
appeared even earlier than in most IL-2null mice. These findings suggest
that neither CD8+ IEL nor LPL were causal in the onset of colitis in
IL-2null animals. In IL-2null x beta 2mnull mice, an ulcerative
colitis-like disease was evident from histological studies and
immunohistological staining which showed very large numbers of CD4+
lymphocytes within the intestinal mucosa. Significant ex vivo killing by
CD4+ T cells was observed in IL-2null x beta 2null animals, although
this required an extended incubation time compared to colonic CD8+ T
cells. Peripheral as well as colonic CD4+ T cells in IL-2null and
IL-2null x beta 2mnull animals, were activated as judged by their cell
surface phenotype (CD45RBlo, L-selectinlo and CD69+). In light of these
findings, we propose that infiltrating CD4+, but not CD8+ T cells are
central to the inflammation observed in the intestinal mucosa in
IL-2null colitis.
DE Animal Colitis, Ulcerative/*IMMUNOLOGY Colon/IMMUNOLOGY Cytotoxicity,
Immunologic CD4-Positive T-Lymphocytes/*IMMUNOLOGY CD8-Positive
T-Lymphocytes/*IMMUNOLOGY Disease Models, Animal
Interleukin-2/*DEFICIENCY Mice Mice, Inbred C57BL Support, Non-U.S.
Gov't Support, U.S. Gov't, P.H.S. T-Lymphocyte Subsets JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).