Duration of fusion pore opening and the amount of hormone released are regulated by myosin II during kiss-and-run exocytosis
Rattachement africain : jp. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Since the fusion pore of the secretory vesicle is resealed before complete dilation during 'kiss-and-run' exocytosis, their cargoes are not completely released. Although the transient fusion pore is kept open for several seconds, the precise mechanisms that control fusion pore maintenance, and their physiological significance, are not well understood. Using dual-colour TIRF (total internal reflection fluorescence) microscopy in neuroendocrine PC12 cells, we show that myosin II regulates the fusion pore dynamics during kiss-and-run exocytosis. The release kinetics of mRFP (monomeric red fluorescent protein)-tagged tPA (tissue plasminogen activator) and Venus-tagged BDNF (brain-derived neurotrophic factor), which show slower release kinetics than NPY (neuropeptide Y)-mRFP and insulin-mRFP, were prolonged by the overexpression of a wild-type form of the RLC (myosin II regulatory light chain). In contrast, overexpression of a dominant-negative form of RLC shortened the release kinetics. Using spH (synapto-pHluorin), a green fluorescent protein-based pH sensor inside the vesicles, we confirmed that the modulation of the release kinetics by myosin II is due to changes in the duration of fusion pore opening. In addition, we revealed that the amount of hormone released into the extracellular space upon stimulation was increased by overexpression of wild-type RLC. We propose that the duration of fusion pore opening is regulated by myosin II to control the amount of hormone released from a single vesicle.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Duration of fusion pore opening and the amount of hormone released are regulated by myosin II during kiss-and-run exocytosis
- Date Crossref
- 14/07/2010
- Éditeur
- Portland Press Ltd.
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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The University of Tokyo pays non établi dans la noticeUniversité ou école supérieure
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Japan Science and Technology Agency pays non établi dans la noticeOrganisme public
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RIKEN Center for Brain Science pays non établi dans la noticeStructure de recherche
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Graduate School of Arts and Sciences Department of Life Sciences pays non établi dans la noticeUniversité ou école supérieure
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Life Function and Dynamics pays non établi dans la noticeInstitution
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Laboratory for Cell Function and Dynamics pays non établi dans la noticeStructure de recherche
The University of Tokyo, Japan Science and Technology Agency et RIKEN Center for Brain Science, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.