Mast cells reside at the host-environment interface, serving as immune sentinels in both protective and pathological responses. The high affinity IgE receptor, Fc?RI, is the best-understood mast cell-activating pathway. Mast cell homeostasis is likely regulated by cytokines produced in the inflammatory response, perhaps in an autocrine fashion. We demonstrate that IL-10 suppresses Fc?RI-mediated activation by targeting Fyn, Stat5, and Akt for degradation. Importantly, this suppression is observed in mast cells from Th1-prone C57BL/6 but not Th2-prone BALB/c or 129/Sv mice. IL-10 sensitivity correlates with the induction of microRNAs (miRs) potentially targeting Fyn, Stat5B, and Akt. While Fyn is known to activate Akt, the role of Stat5 is less understood. We find that Stat5B is critical for Fc?RI-induced cytokine production. We demonstrate that Stat5 tyrosine phosphorylation is Fyn-dependent and that Fyn physically interacts with Stat5. Stat5 is also serine phosphorylated during IgE signaling, through a Fyn-independent pathway. We will determine how the Fyn-Stat5/Akt pathway is regulated by IL-10, and if resistance to this suppression correlates with allergic disease. Our hypothesis is that Fc?RI activation is limited by feedback signaling via IL-10-induced miRs that selectively dampen the Fyn-Stat5/Akt pathway. Loss of this regulation in a non-permissive genetic background could be part of atopic etiology.
Specific Aims I. To test the hypothesis that IL-10 antagonizes the Fyn-Stat5/Akt pathway via genotype-restricted effects on miR induction in mast cells and basophils. II. To test the hypothesis that Stat5B is critical for Fc?RI signaling in mast cells and basophils. III. To test the hypothesis that IL-10 suppresses Fc?RI responses in vivo by antagonizing the Fyn-Stat5/Akt pathway.

Public Health Relevance

Chronic mast cell activation is at the center of allergic diseases like asthma. We have uncovered mast cell suppression by IL-10, which appears to be deficient in mice, and perhaps people, with a genetic predisposition to allergic disease. Our study will test the hypothesis that IL-10 is a natural feedback regulator of mast cell-mediated inflammation, and that loss of this process contributes to allergic disease.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Project (R01)
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Innate Immunity and Inflammation (III)
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Dong, Gang
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Virginia Commonwealth University
Schools of Arts and Sciences
United States
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McLeod, Jamie Josephine Avila; Caslin, Heather L; Spence, Andrew J et al. (2017) Didox (3,4-dihydroxybenzohydroxamic acid) suppresses IgE-mediated mast cell activation through attenuation of NF?B and AP-1 transcription. Cell Immunol 322:41-48
Caslin, Heather L; McLeod, Jamie Josephine Avila; Spence, Andrew J et al. (2017) Didox (3,4-dihydroxybenzohydroxamic acid) suppresses IL-33-induced cytokine production in primary mouse mast cells. Cell Immunol 319:10-16
Ndaw, Victor S; Abebayehu, Daniel; Spence, Andrew J et al. (2017) TGF-?1 Suppresses IL-33-Induced Mast Cell Function. J Immunol 199:866-873
Abebayehu, Daniel; Spence, Andrew; Boyan, Barbara D et al. (2017) Galectin-1 promotes an M2 macrophage response to polydioxanone scaffolds. J Biomed Mater Res A 105:2562-2571
Paranjape, Anuya; Chernushevich, Oksana; Qayum, Amina Abdul et al. (2016) Dexamethasone rapidly suppresses IL-33-stimulated mast cell function by blocking transcription factor activity. J Leukoc Biol 100:1395-1404
Kolawole, Elizabeth Motunrayo; McLeod, Jamie Josephine Avila; Ndaw, Victor et al. (2016) Fluvastatin Suppresses Mast Cell and Basophil IgE Responses: Genotype-Dependent Effects. J Immunol 196:1461-70
Abebayehu, Daniel; Spence, Andrew J; Qayum, Amina Abdul et al. (2016) Lactic Acid Suppresses IL-33-Mediated Mast Cell Inflammatory Responses via Hypoxia-Inducible Factor-1?-Dependent miR-155 Suppression. J Immunol 197:2909-17
Qayum, Amina Abdul; Paranjape, Anuya; Abebayehu, Daniel et al. (2016) IL-10-Induced miR-155 Targets SOCS1 To Enhance IgE-Mediated Mast Cell Function. J Immunol 196:4457-67
Oskeritzian, Carole A; Hait, Nitai C; Wedman, Piper et al. (2015) The sphingosine-1-phosphate/sphingosine-1-phosphate receptor 2 axis regulates early airway T-cell infiltration in murine mast cell-dependent acute allergic responses. J Allergy Clin Immunol 135:1008-18.e1
McLeod, Jamie J A; Baker, Bianca; Ryan, John J (2015) Mast cell production and response to IL-4 and IL-13. Cytokine 75:57-61

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