Abstract
Mice that lack the p85α regulatory subunit of phosphatidylinositol-3 kinase (PI3K) are deficient in gastrointestinal and peritoneal mast cells but have dermal mast cells. Accordingly, these mice show impaired bacterial clearance in response to acute septic peritonitis and are highly susceptible to infection by the intestinal nematode Strongyloides venezuelensis. Systemic anaphylactic shock responses, however, are intact. We found that although reconstitution of PI3K−/− mice with bone marrow–derived mast cells (BMMCs) restored anti-bacterial immunity, only T helper type 2 (TH2)-conditioned BMMCs, not "standard" BMMCs, were able to restore anti-nematode immunity. This finding highlights the importance of the TH2 response in the control of nematode infection. Thus, PI3K likely plays an essential role in host immune responses by regulating both the development and induction of mast cells.
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Acknowledgements
We thank M. Motouchi and K. Furuichi for animal care; S. Matsuda for valuable discussions; L. K. Clayton and J. Fujimoto for critical reading of the manuscript; and the Department of Dermatology of Keio University School of Medicine for experimental equipment. Supported by a Keio University Special Grant-in-Aid for Innovative Collaborative Research Project; a grant for the Research For The Future Program (JSPS-RFTF-97L00701) from the Japan Society for the Promotion of Science; a Grant-in-Aid for Scientific Research on Priority Areas (C) (13226112); a National Grant-in-Aid for the Establishment of a High-Tech Research Center in a Private University; a grant for the Promotion of the Advancement of Education and Research in Graduate Schools; and a Scientific Frontier Research Grant from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Fukao, T., Yamada, T., Tanabe, M. et al. Selective loss of gastrointestinal mast cells and impaired immunity in PI3K-deficient mice. Nat Immunol 3, 295–304 (2002). https://doi.org/10.1038/ni768
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DOI: https://doi.org/10.1038/ni768
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