title: Perivascular mast cells dynamically probe cutaneous blood vessels to capture immunoglobulin E.
abstract: Mast cells are tissue-resident immune cells that play a central role in allergic disease. These contributions are largely dependent on the acquisition of antigen-specific immunoglobulin E (IgE). Despite this requirement, studies of mast cell and IgE interactions have overlooked the mechanism by which mast cells acquire IgE from the blood. To address this gap, we developed reporter IgE molecules and employed imaging techniques to study mast cell function in situ. Our data demonstrate that skin mast cells exhibit selective uptake of IgE based on perivascular positioning. Furthermore, perivascular mast cells acquire IgE by extending cell processes across the vessel wall to capture luminal IgE. These data demonstrate how tissue mast cells acquire IgE and reveal a strategy by which extravascular cells monitor blood contents to capture molecules central to cellular function.
authors.affiliation: Department of Pediatrics, University of California, San Francisco, San Francisco, CA 94143, USA.
authors.forename: Laurence E
authors.initials: LE
authors.lastname: Cheng
authors.forename: Karin
authors.initials: K
authors.lastname: Hartmann
authors.forename: Axel
authors.initials: A
authors.lastname: Roers
authors.forename: Matthew F
authors.initials: MF
authors.lastname: Krummel
authors.forename: Richard M
authors.initials: RM
authors.lastname: Locksley
mesh_terms: D000818:Animals; D058948:Cell Tracking; D007073:Immunoglobulin E / Q000276:immunology* / Q000378:metabolism; D016130:Immunophenotyping; D008407:Mast Cells / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D010529:Peritoneal Cavity / Q000166:cytology; D010537:Peritoneum / Q000276:immunology; D011485:Protein Binding / Q000276:immunology; D017455:Receptors, IgE / Q000276:immunology / Q000378:metabolism; D012867:Skin / Q000276:immunology* / Q000378:metabolism
chemical_list: D017455:Receptors, IgE; D007073:Immunoglobulin E