Abstract:
:In chromaffin cells, SNARE proteins, forming the basic exocytotic machinery are present in membrane clusters of 500-600 nm in diameter. These microdomains containing both SNAP-25 and syntaxin-1 are dynamic and the expression of altered forms of SNAREs modifies not only their motion but also the mobility of the associated granules. It is also clear that SNARE microdomain location defines the place for individual vesicle fusion and that the alteration of cluster dynamics affects the fusion process itself. Interestingly, these SNARE patches colocalize with the borders of F-actin cages forming the cytoskeletal cortical network, and these borders also contain clusters of L- and P/Q type calcium channels. The organization of the secretory machinery in association with the borders of cytoskeletal cages seems to be an effective way to promote fast coupling between calcium entry and catecholamine release as demonstrated with the use of mathematical secretory models.
journal_name
Cell Mol Neurobioljournal_title
Cellular and molecular neurobiologyauthors
Torregrosa-Hetland CJ,Villanueva J,López-Font I,Garcia-Martinez V,Gil A,Gonzalez-Vélez V,Segura J,Viniegra S,Gutiérrez LMdoi
10.1007/s10571-010-9565-1subject
Has Abstractpub_date
2010-11-01 00:00:00pages
1315-9issue
8eissn
0272-4340issn
1573-6830journal_volume
30pub_type
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