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M9550103.TXT
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1995-03-04
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Document 0103
DOCN M9550103
TI Evidence that cytokine-mediated immune interactions induced by
Schistosoma mansoni alter disease outcome in mice concurrently infected
with Trichuris muris.
DT 9505
AU Curry AJ; Else KJ; Jones F; Bancroft A; Grencis RK; Dunne DW; Department
of Pathology, University of Cambridge, United Kingdom.
SO J Exp Med. 1995 Feb 1;181(2):769-74. Unique Identifier : AIDSLINE
MED/95138709
AB In murine models of Schistosoma mansoni infection, egg production is
associated with a switch from T helper cell (Th)1- to Th2-type responses
to both schistosome-specific and unrelated antigens. Polyparasitism is
common in human populations within S. mansoni endemic areas. We have,
therefore, examined whether coinfection with S. mansoni could affect the
outcome of a second parasitic infection, through Th2 cytokine-dependent
modifications to the host immune response. We find that when mice
susceptible to infection with the gut nematode Trichuris muris are
coinfected with S. mansoni, they acquire the capacity to resolve T.
muris infection, thus demonstrating a resistant phenotype. This ability
to expel T. muris is associated with the production of Th2-associated
cytokines, and corresponding antibody isotypes, in response to S.
mansoni egg antigens. The Th2 response shows that there is no
compartmentalization between spleen and mesenteric lymph nodes, and that
the expulsion of T. muris is not caused by any changes in the host
intestine associated with excretion of schistosome eggs. This influence
of schistosome infections may be important, not only for the outcome of
infections with unrelated pathogens in endemic areas, but also for the
efficacy of vaccines in such areas.
DE Animal Antibodies, Helminth/IMMUNOLOGY Cytokines/*IMMUNOLOGY
Down-Regulation (Physiology) Human Intestines/PATHOLOGY Mice Mice,
Inbred AKR *Schistosoma mansoni
Schistosomiasis/COMPLICATIONS/*IMMUNOLOGY Support, Non-U.S. Gov't Th1
Cells/IMMUNOLOGY Th2 Cells/IMMUNOLOGY
Trichuriasis/COMPLICATIONS/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).