| Literature DB >> 19124833 |
Jayme D Allen1, Zahara M Jaffer, Su-Jung Park, Sarah Burgin, Clemens Hofmann, Mary Ann Sells, Shi Chen, Ethel Derr-Yellin, Elizabeth G Michels, Andrew McDaniel, Waylan K Bessler, David A Ingram, Simon J Atkinson, Jeffrey B Travers, Jonathan Chernoff, D Wade Clapp.
Abstract
Mast cells are key participants in allergic diseases via activation of high-affinity IgE receptors (FcepsilonRI) resulting in release of proinflammatory mediators. The biochemical pathways linking IgE activation to calcium influx and cytoskeletal changes required for intracellular granule release are incompletely understood. We demonstrate, genetically, that Pak1 is required for this process. In a passive cutaneous anaphylaxis experiment, W(sh)/W(sh) mast cell-deficient mice locally reconstituted with Pak1(-/-) bone marrow-derived mast cells (BMMCs) experienced strikingly decreased allergen-induced vascular permeability compared with controls. Consistent with the in vivo phenotype, Pak1(-/-) BMMCs exhibited a reduction in FcepsilonRI-induced degranulation. Further, Pak1(-/-) BMMCs demonstrated diminished calcium mobilization and altered depolymerization of cortical filamentous actin (F-actin) in response to FcepsilonRI stimulation. These data implicate Pak1 as an essential molecular target for modulating acute mast cell responses that contribute to allergic diseases.Entities:
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Year: 2009 PMID： 19124833 PMCID： PMC2661857 DOI： 10.1182/blood-2008-06-160861
Source DB: PubMed Journal: Blood ISSN： 0006-4971 Impact factor: 22.113