Counter-regulatory anti-parasite cytokine responses during concurrent Plasmodium yoelii and intestinal helminth infections in mice |
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Authors: | Noland Gregory S Urban Joseph F Fried Bernard Kumar Nirbhay |
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Institution: | a Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Room E5144, Baltimore, MD 21205, USA b Diet, Genomics, and Immunology Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, USA c Department of Biology, Lafayette College, Easton, PA, USA |
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Abstract: | Malaria and helminth infections are two of the most prevalent parasitic diseases globally. While concomitant infection is common, mechanisms contributing to altered disease outcomes during co-infection remain poorly defined. We have previously reported exacerbation of normally non-lethal Plasmodium yoelii malaria in BALB/c mice chronically infected with the intestinal trematode Echinostoma caproni. The goal of the present studies was to determine the effect of helminth infection on IFN-γ and other key cytokines during malaria co-infection in the P. yoelii-E. caproni and P. yoelii-Heligmosomoides polygyrus model systems. Polyclonally stimulated spleen cells from both E. caproni- and H. polygyrus-infected mice produced significantly lower amounts of IFN-γ during P. yoelii co-infection than malaria-only infected mice. Furthermore, the magnitude of IFN-γ suppression was correlated with the relative amounts of IL-4 induced by these helminths (E. caproni = low; H. polygyrus = high), but not IL-10. Concurrent malaria infection also suppressed helminth-associated IL-4 responses, indicating that immunologic counter-regulation occurs during co-infection with malaria and intestinal helminths. |
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Keywords: | Malaria Helminths Co-infection Plasmodium yoelii Echinostoma caproni Heligmosomoides polygyrus IFN-γ IL-4 Cytokines Immune regulation Trematode Nematode |
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