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Splenic B Cells from Hymenolepis diminuta-Infected Mice Ameliorate Colitis Independent of T Cells and via Cooperation with Macrophages
University of Calgary, Canada.
University of Calgary, Canada.
University of Calgary, Canada.
University of Calgary, Canada.
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2015 (English)In: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 194, no 1, 364-378 p.Article in journal (Refereed) Published
Abstract [en]

Helminth parasites provoke multicellular immune responses in their hosts that can suppress concomitant disease. The gut lumen-dwelling tapeworm Hymenolepis diminuta, unlike other parasites assessed as helminth therapy, causes no host tissue damage while potently suppressing murine colitis. With the goal of harnessing the immunomodulatory capacity of infection with H. diminuta, we assessed the putative generation of anti-colitic regulatory B cells following H. diminuta infection. Splenic CD19(+) B cells isolated from mice infected 7 [HdBc(7(d))] and 14(d) (but not 3(d)) previously with H. diminuta and transferred to naive mice significantly reduced the severity of dinitrobenzene sulfonic acid (DNBS)-, oxazolone-, and dextran-sodium sulfate-induced colitis. Mechanistic studies with the DNBS model, revealed the anti-colitic HdBc(7(d)) was within the follicular B cell population and its phenotype was not dependent on IL-4 or IL-10. The HdBc(7(d)) were not characterized by increased expression of CD1d, CD5, CD23, or IL-10 production, but did spontaneously, and upon LPS plus anti-CD40 stimulation, produce more TGF-beta than CD19(+) B cells from controls. DNBS-induced colitis in RAG1(-/-) mice was inhibited by administration of HdBc(7(d)), indicating a lack of a requirement for T and B cells in the recipient; however, depletion of macrophages in recipient mice abrogated the anti-colitic effect of HdBc(7(d)). Thus, in response to H. diminuta, a putatively unique splenic CD19(+) B cell with a functional immunoregulatory program is generated that promotes the suppression of colitis dominated by TH1, TH2, or TH1-plus-TH2 events, and may do so via the synthesis of TGF-beta and the generation of, or cooperation with, a regulatory macrophage.

Place, publisher, year, edition, pages
American Association of Immunologists , 2015. Vol. 194, no 1, 364-378 p.
National Category
Clinical Medicine
URN: urn:nbn:se:liu:diva-113569DOI: 10.4049/jimmunol.1400738ISI: 000346700500039PubMedID: 25452561OAI: diva2:783094

Funding Agencies|Natural Sciences and Engineering Research Council of Canada; Crohns and Colitis Foundation of Canada; Alberta Innovates-Health Solutions; Canadian Institutes for Health Research; Canadian Association of Gastroenterology; Janssen Pharmaceuticals; Canadian Digestive Health Foundation; Host-Parasite Interactions Natural Sciences and Engineering Research Council

Available from: 2015-01-23 Created: 2015-01-23 Last updated: 2015-01-23

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Sigvardsson, Mikael
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Division of Microbiology and Molecular MedicineFaculty of Health Sciences
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