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The macrophage beta-glucan receptor mediates arachidonate release induced by zymosan: Essential role for Src family kinases.

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Author

  • Sandra Olsson
  • Roger Sundler

Summary, in English

Yeast-derived zymosan beads are among the classical agents used to induce sterile inflammatory responses in experimental animals and macrophage activation in cell culture. In macrophages the cytosolic phospholipase A2 becomes activated, leading to mobilization of arachidonate and the generation of prostaglandins and leukotrienes. Although zymosan can interact with several receptors it has not been unequivocally demonstrated which interaction is required for induction of the eicosanoid response. We have compared arachidonate release induced in primary mouse macrophages by zymosan and particulate beta-glucan and found striking similarities. The similarities include the effects of dectin-1 antagonists (soluble beta-glucan and laminarin) and of inhibitors of Src family kinases, the Tec kinase Btk, phosphatidylinositol 3-kinase and the Map kinases ERK and p38. Furthermore, particulate beta-glucan was equally effective as zymosan in causing phosphorylation of phospholipase C gamma 2, arguing that both agents act via the beta-glucan receptor dectin-1 and that the above signal components are engaged down-stream of that receptor. Suggestive evidence for a role of the scaffold adaptor Gab2 is also presented. (c) 2006 Elsevier Ltd. All rights reserved.

Publishing year

2007

Language

English

Pages

1509-1515

Publication/Series

Molecular Immunology

Volume

44

Issue

7

Document type

Journal article

Publisher

Pergamon Press Ltd.

Topic

  • Immunology in the medical area

Keywords

  • Btk Gab2
  • cPLA2
  • dectin-1
  • eicosanoids
  • PLC gamma 2

Status

Published

Research group

  • Vessel Wall Biology

ISBN/ISSN/Other

  • ISSN: 1872-9142