Compound vesicle fusion increases quantal size and potentiates synaptic transmission

Liming He, Lei Xue, Jianhua Xu, Benjamin D. McNeil, Li Bai, Ernestina Melicoff, Roberto Adachi, Ling Gang Wu

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Exocytosis at synapses involves fusion between vesicles and the plasma membrane. Although compound fusion between vesicles was proposed to occur at ribbon-type synapses, whether it exists, how it is mediated, and what role it plays at conventional synapses remain unclear. Here we report the existence of compound fusion, its underlying mechanism, and its role at a nerve terminal containing conventional active zones in rats and mice. We found that high potassium application and high frequency firing induced giant capacitance up-steps, reflecting exocytosis of vesicles larger than regular ones, followed by giant down-steps, reflecting bulk endocytosis. These intense stimuli also induced giant vesicle-like structures, as observed with electron microscopy, and giant miniature excitatory postsynaptic currents (mEPSCs), reflecting more transmitter release. Calcium and its sensor for vesicle fusion, synaptotagmin, were required for these giant events. After high frequency firing, calcium/synaptotagmin-dependent mEPSC size increase was paralleled by calcium/synaptotagmin-dependent post-tetanic potentiation. These results suggest a new route of exocytosis and endocytosis composed of three steps. First, calcium/synaptotagmin mediates compound fusion between vesicles. Second, exocytosis of compound vesicles increases quantal size, which increases synaptic strength and contributes to the generation of post-tetanic potentiation. Third, exocytosed compound vesicles are retrieved via bulk endocytosis. We suggest that this vesicle cycling route be included in models of synapses in which only vesicle fusion with the plasma membrane is considered.

Original languageEnglish (US)
Pages (from-to)93-97
Number of pages5
JournalNature
Volume459
Issue number7243
DOIs
StatePublished - May 7 2009

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Synaptotagmins
Exocytosis
Synaptic Transmission
Synapses
Endocytosis
Calcium
Excitatory Postsynaptic Potentials
Cell Membrane
Electron Microscopy
Potassium

ASJC Scopus subject areas

  • General

Cite this

He, L., Xue, L., Xu, J., McNeil, B. D., Bai, L., Melicoff, E., ... Wu, L. G. (2009). Compound vesicle fusion increases quantal size and potentiates synaptic transmission. Nature, 459(7243), 93-97. https://doi.org/10.1038/nature07860

Compound vesicle fusion increases quantal size and potentiates synaptic transmission. / He, Liming; Xue, Lei; Xu, Jianhua; McNeil, Benjamin D.; Bai, Li; Melicoff, Ernestina; Adachi, Roberto; Wu, Ling Gang.

In: Nature, Vol. 459, No. 7243, 07.05.2009, p. 93-97.

Research output: Contribution to journalArticle

He, L, Xue, L, Xu, J, McNeil, BD, Bai, L, Melicoff, E, Adachi, R & Wu, LG 2009, 'Compound vesicle fusion increases quantal size and potentiates synaptic transmission', Nature, vol. 459, no. 7243, pp. 93-97. https://doi.org/10.1038/nature07860
He L, Xue L, Xu J, McNeil BD, Bai L, Melicoff E et al. Compound vesicle fusion increases quantal size and potentiates synaptic transmission. Nature. 2009 May 7;459(7243):93-97. https://doi.org/10.1038/nature07860
He, Liming ; Xue, Lei ; Xu, Jianhua ; McNeil, Benjamin D. ; Bai, Li ; Melicoff, Ernestina ; Adachi, Roberto ; Wu, Ling Gang. / Compound vesicle fusion increases quantal size and potentiates synaptic transmission. In: Nature. 2009 ; Vol. 459, No. 7243. pp. 93-97.
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