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Clathrin-mediated endocytosis: the physiological mechanism of vesicle retrieval at hippocampal synapses
Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
MRC-LMB, Cambridge.
MRC-LMB, Cambridge.
MRC-LMB, Cambridge.
2007 (English)In: Journal of Physiology, ISSN 0022-3751, Vol. 585, no 3, 681-686 p.Article, review/survey (Refereed) Published
Abstract [en]

The maintenance of synaptic transmission requires that vesicles are recycled after releasing neurotransmitter. Several modes of retrieval have been proposed to operate at small synaptic terminals of central neurons, but the relative importance of these has been controversial. It is established that synaptic vesicles can collapse on fusion and the machinery for retrieving this membrane by clathrin-mediated endocytosis (CME) is enriched in the presynaptic terminal. But it has also been suggested that the majority of vesicles released by physiological stimulation are recycled by a second, faster mechanism called 'kiss-and-run', which operates in 1 s or less to retrieve a vesicle before it has collapsed. The most recent evidence argues against the occurrence of 'kiss-and-run' in hippocampal synapses. First, an improved fluorescent reporter of exocytosis (sypHy), indicates that only a slow mode of endocytosis (tau = 15 s) operates when vesicle fusion is triggered by a single nerve impulse or short burst. Second, this retrieval mechanism is blocked by overexpressing the C-terminal fragment of AP180 or by knockdown of clathrin using RNAi. Third, vesicle fusion is associated with the movement of clathrin and vesicle proteins out of the synapse into the neighbouring axon. These observations indicate that clathrin-mediated endocytosis is the major, if not exclusive, mechanism of retrieval in small hippocampal synapses.

Place, publisher, year, edition, pages
2007. Vol. 585, no 3, 681-686 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-53186DOI: 10.1113/jphysiol.2007.139022PubMedID: 17599959OAI: diva2:287565
Available from: 2010-01-19 Created: 2010-01-19 Last updated: 2010-01-19

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Granseth, Björn
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