Abstract
Although primary and memory responses against bacteria and viruses have been studied extensively, T helper type 2 (TH2) effector mechanisms leading to host protection against helminthic parasites remain elusive1. Examination of the intestinal epithelial submucosa of mice after primary and secondary infections by a natural gastrointestinal parasite revealed a distinct immune-cell infiltrate after challenge, featuring interleukin-4–expressing memory CD4+ T cells that induced IL-4 receptorhi (IL-4Rhi) CD206+ alternatively activated macrophages2. In turn, these alternatively activated macrophages (AAMacs) functioned as important effector cells of the protective memory response contributing to parasite elimination, demonstrating a previously unknown mechanism for host protection against intestinal helminths.
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Acknowledgements
The authors would like to thank F.D. Finkelman, S.J. Leibovich and E.J. Allenspach for critically reviewing this manuscript.
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Supplementary information
Supplementary Fig. 1
The life cycle of H. polygyrus. (PDF 144 kb)
Supplementary Fig. 2
An inflammatory Th2 microenviroment develops around Hp larvae 4 days after challenge. (PDF 205 kb)
Supplementary Fig. 3
CD4+ T cells from Hp primed and drug cured mice can transfer protection to wild type, but not stat6−/− mice. (PDF 1263 kb)
Supplementary Fig. 4
Collagen is deposited around the parasite at later stages of a challenge infection and is associated with the Th2 inflammatory response. (PDF 189 kb)
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Anthony, R., Urban, J., Alem, F. et al. Memory TH2 cells induce alternatively activated macrophages to mediate protection against nematode parasites. Nat Med 12, 955–960 (2006). https://doi.org/10.1038/nm1451
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DOI: https://doi.org/10.1038/nm1451
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