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First published online 27 November 2002
doi: 10.1242/jcs.00216
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Research Article |
1 Unité d'Immuno-Allergie, Institut Pasteur, Paris, France
2 Unité INSERM 363, ICGM, Hôpital Cochin, Paris, France
3 Molecular Inflammation Section, National Institute of Arthritis and
Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD
20892, USA
* Author for correspondence (e-mail: ublank{at}pasteur.fr)
Accepted 10 October 2002
Compound exocytosis of inflammatory mediators from mast cells requires SNARE and a series of accessory proteins. However, the molecular steps that regulate secretory granule movement and membrane fusion as well as the role of the cytoskeleton are still poorly understood. Here, we report on our investigation of the role of syntaxin-binding Munc18 isoforms and the microtubule network in this process. We found that mast cells express Munc18-2, which interacts with target SNAREs syntaxin 2 or 3, as well as Munc18-3, which interacts with syntaxin 4. Munc18-2 was localised to secretory granules, whereas Munc18-3 was found on the plasma membrane. Increased expression of Munc18-2 and derived peptides containing an interfering effector loop inhibited IgE-triggered exocytosis, while increased expression of Munc18-3 showed no effect. Munc18-2 localisation on granules is polarised; however, upon stimulation Munc18-2 redistributed into forming lamellipodia and persisted on granules that were aligned along microtubules, but was excluded from F-actin ruffles. Disruption of the microtubule network with nocodazole provoked Munc18-2 redistribution and affected mediator release. These findings suggest a role for Munc18-2 and the microtubule network in the regulation of secretory granule dynamics in mast cells.
Key words: Mast cell, Exocytosis, Cytoskeleton, Munc18
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