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Infection and Immunity, November 2008, p. 5164-5172, Vol. 76, No. 11
0019-9567/08/$08.00+0     doi:10.1128/IAI.00673-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Coinfection with the Intestinal Nematode Heligmosomoides polygyrus Markedly Reduces Hepatic Egg-Induced Immunopathology and Proinflammatory Cytokines in Mouse Models of Severe Schistosomiasis{triangledown}

Lindsey E. Bazzone,1,{dagger} Patrick M. Smith,1,{dagger} Laura I. Rutitzky,1 Mara G. Shainheit,1 Joseph F. Urban,3 Tommy Setiawan,2 Arthur M. Blum,2 Joel V. Weinstock,2 and Miguel J. Stadecker1*

Department of Pathology, Tufts University School of Medicine, Boston, Massachusetts,1 Division of Gastroenterology, Tufts Medical Center, Boston, Massachusetts,2 Diet, Genomic and Immunology Laboratory, Beltsville Human Nutrition Research Center, Beltsville, Maryland3

Received 29 May 2008/ Accepted 12 August 2008

Infection with the trematode helminth Schistosoma mansoni results in a parasite egg-induced, CD4 T-cell-mediated, hepatointestinal granulomatous and fibrosing inflammation that varies greatly in severity, with a higher frequency of milder forms typically occurring in regions where the disease is endemic. One possible explanation for this is that in these regions the degree of inflammation is lessened by widespread concurrent infection with gastrointestinal nematodes. We tested this hypothesis by establishing a murine coinfection model in which mice were infected with the intestinal nematode parasite Heligmosomoides polygyrus prior to infection with S. mansoni. In CBA mice that naturally display a severe form of schistosomiasis, preinfection with H. polygyrus resulted in a marked reduction in schistosome egg-induced hepatic immunopathology, which was associated with significant decreases in the levels of interleukin-17 (IL-17), gamma interferon, tumor necrosis factor alpha, IL-23, IL-6, and IL-1β and with increases in the levels of IL-4, IL-5, IL-10, and transforming growth factor β in mesenteric lymph node cells, purified CD4 T cells, and isolated liver granuloma cells. There also were increases in liver Ym1 and forkhead box P3 transcription factor expression. In another model of high-pathology schistosomiasis induced in C57BL/6 mice by immunization with schistosome egg antigens in complete Freund's adjuvant, coinfection with the nematodes also resulted in a marked inhibition of hepatic immunopathology accompanied by similar shifts in cytokine production. These findings demonstrate that intestinal nematodes prevent Th1- and Th17-cell-mediated inflammation by promoting a strong Th2-polarized environment associated with increases in the levels of alternatively activated macrophages and T regulatory cells, which result in significant amelioration of schistosome-induced immunopathology.

* Corresponding author. Mailing address: Department of Pathology, Tufts University School of Medicine, 150 Harrison Avenue, Boston, MA 02111. Phone: (617) 636-6732. Fax: (617) 636-2990. E-mail: Miguel.stadecker{at}tufts.edu

{triangledown} Published ahead of print on 18 August 2008.

Editor: W. A. Petri, Jr.

{dagger} L.E.B. and P.M.S. contributed equally to this work.

Infection and Immunity, November 2008, p. 5164-5172, Vol. 76, No. 11
0019-9567/08/$08.00+0     doi:10.1128/IAI.00673-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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