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1 Department of Internal Medicine, Division of Gastroenterology-Hepatology, University of Iowa College of Medicine, Iowa City, Iowa 52242; and the 2 Immunology Disease Resistance Laboratory, Animal and Natural Resources Institute, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD 20705
Crohn's disease results from dysregulated T
helper (Th)1-type mucosal inflammation. Crohn's disease is rare in
tropical countries but prevalent in developed countries with temperate
climates, in which its incidence rose after 1940. In contrast, exposure to helminthic parasites is common in tropical countries but is rare in
developed countries. Helminthic parasites induce immunomodulatory T
cell responses in the host. We hypothesize that immunomodulatory responses due to helminths may attenuate excessive Th1-type
inflammation. To test that hypothesis, mice were exposed to eggs of the
helminth Schistosoma mansoni and then challenged rectally
with trinitrobenzesulfonic acid (TNBS) to induce colitis. Schistosome
egg exposure attenuated TNBS colitis and protected mice from lethal
inflammation. Schistosome egg exposure diminished IFN-
and enhanced
IL-4 production from
CD3-stimulated spleen and mesenteric lymph node
cells of TNBS-treated mice. Schistosome egg exposure decreased colonic
IFN-
but increased IL-10 mRNA expression in TNBS-treated mice.
Intact signal transducer and activator of transcription 6 was required
for attenuation of colitis. Exposure to helminths can decrease murine
colonic inflammation.
Schistosoma mansoni
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