Multicore vesicles: hyperosmolarity and L-DOPA induce homotypic fusion of dense core vesicles.

Abstract:

AIM:A fraction of vesicles in cells treated with hypertonic solution exhibit multiple dense cores and this is enhanced by treatment with L-3,4-dihydroxyphenylalanine (L-DOPA). These cells were examined to determine if the multicore vesicles are the product of endocytosis or homotypic fusion. METHODS:Electron microscopy was used to determine the number of multicore vesicles and amperometry was used to examine if the multicore vesicles are a competent fraction of the readily releasable pool. RESULTS:In this study, we observed that a substantial portion (15.3%) of large dense core vesicles in PC12 cells contained multiple cores in hypertonic saline loaded with L-DOPA, and amperometric measurements show a bimodal distribution of quantal sizes in treated cells. CONCLUSIONS:The results suggest that the multicored vesicles are formed from homotypic fusion of LCDVs prior to exocytosis.

journal_name

Cell Mol Neurobiol

authors

Sombers LA,Maxson MM,Ewing AG

doi

10.1007/s10571-007-9156-y

subject

Has Abstract

pub_date

2007-08-01 00:00:00

pages

681-5

issue

5

eissn

0272-4340

issn

1573-6830

journal_volume

27

pub_type

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