Document Detail

Selective recapture of secretory granule components after full collapse exocytosis in neuroendocrine chromaffin cells.
MedLine Citation:
PMID:  20880191     Owner:  NLM     Status:  In-Process    
In secretory cells, calcium-regulated exocytosis is rapidly followed by compensatory endocytosis. Neuroendocrine cells secrete hormones and neuropeptides through various modes of exo-endocytosis, including kiss-and-run, cavicapture and full-collapse fusion. During kiss-and-run and cavicapture modes, the granule membrane is maintained in an omega shape, whereas it completely merges with the plasma membrane during full-collapse mode. As the composition of the granule membrane is very different from that of the plasma membrane, a precise sorting process of granular proteins must occur. However, the fate of secretory granule membrane after full fusion exocytosis remains uncertain. Here, we investigated the mechanisms governing endocytosis of collapsed granule membranes by following internalization of antibodies labeling the granule membrane protein, dopamine-β-hydroxylase (DBH) in cultured chromaffin cells. Using immunofluorescence and electron microscopy, we observed that after full collapse, DBH remains clustered on the plasma membrane with other specific granule markers and is subsequently internalized through vesicular structures composed mainly of granule components. Moreover, the incorporation of this recaptured granule membrane into an early endosomal compartment is dependent on clathrin and actin. Altogether, these results suggest that after full collapse exocytosis, a selective sorting of granule membrane components is facilitated by the physical preservation of the granule membrane entity on the plasma membrane.
Mara Ceridono; Stéphane Ory; Fanny Momboisse; Sylvette Chasserot-Golaz; Sébastien Houy; Valérie Calco; Anne-Marie Haeberlé; Valérie Demais; Yannick Bailly; Marie-France Bader; Stéphane Gasman
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-29
Journal Detail:
Title:  Traffic (Copenhagen, Denmark)     Volume:  12     ISSN:  1600-0854     ISO Abbreviation:  Traffic     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939340     Medline TA:  Traffic     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  72-88     Citation Subset:  IM    
Copyright Information:
© 2010 John Wiley & Sons A/S.
Institut des Neurosciences Cellulaires et Intégratives (UPR 3212), Centre National de la Recherche Scientifique & Université de Strasbourg, 5 rue Blaise Pascal, F-67084 Strasbourg, France.
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