Amplification mechanisms for the enhancement of antigen-mediated mast cell activation.
Activation of mast cells in the allergic inflammatory response occurs via the high affinity receptor for IgE (FcepsilonRI) following receptor aggregation induced by antigen-mediated cross-linking of IgE-occupied FcepsilonRI. Recent observations suggest this response is profoundly influenced by other factors that reduce the threshold for, and increase the extent of, mast cell activation. For example, under experimental conditions, cell surface receptors such as KIT and specific G protein-coupled receptors synergistically enhance FcepsilonRI-mediated mast cell degranulation and cytokine production. Activating mutations in critical signaling molecules may also contribute to such responses. In this review, we describe our research exploring the mechanisms regulating these synergistic interactions and, furthermore, discuss the relevance of our observations in the context of clinical considerations.
Gilfillan
Alasdair M
AM
Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 10 Center Drive MSC 1881, Bethesda, MD, 20892-1881, USA.
Peavy
Richard D
RD
Metcalfe
Dean D
DD
D048868:Adaptor Proteins, Signal Transducing / Q000276:immunology / Q000378:metabolism; D000818:Animals; D015550:Cell Degranulation / Q000276:immunology*; D006801:Humans; D008407:Mast Cells / Q000276:immunology* / Q000378:metabolism; D019869:Phosphatidylinositol 3-Kinases / Q000276:immunology / Q000378:metabolism; D043562:Receptors, G-Protein-Coupled / Q000276:immunology* / Q000378:metabolism; D017455:Receptors, IgE / Q000276:immunology* / Q000378:metabolism; D015398:Signal Transduction / Q000276:immunology; D019089:Stem Cell Factor / Q000276:immunology* / Q000378:metabolism
D048868:Adaptor Proteins, Signal Transducing; D043562:Receptors, G-Protein-Coupled; D017455:Receptors, IgE; D019089:Stem Cell Factor; D019869:Phosphatidylinositol 3-Kinases