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The Structural Organization of the Readily Releasable Pool of Synaptic Vesicles
Silvio O. Rizzoli and
William J. Betz*
The defining morphological feature of chemical synapses is thevesicle cluster in the presynaptic nerve terminal. It has generallybeen assumed that vesicles closest to release sites are recruitedfirst during nerve activity. We tested this by selectively labelingthe "readily releasable" pool, those vesicles released firstduring physiological stimulation. The readily releasable vesicleswere not clustered close to the presynaptic membrane but insteadwere dispersed almost randomly throughout the vesicle cluster.Thus, vesicles are not recruited according to proximity to releasesites but are mobilized differently, perhaps by being peeledfrom the surface of the cluster.
Department of Physiology & Biophysics, University of Colorado Health Sciences Center, Denver, CO 80262, USA.
* To whom correspondence should be addressed. E-mail: bill.betz{at}uchsc.edu
Synapsin II and calcium regulate vesicle docking and the cross-talk between vesicle pools at the mouse motor terminals.
W. L. Coleman, C. A. Bill, F. Simsek-Duran, G. Lonart, D. Samigullin, and M. Bykhovskaia (2008)
J. Physiol.
586, 4649-4673
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Heterogeneity in Synaptic Vesicle Release at Neuromuscular Synapses of Mice Expressing SynaptopHluorin.
Essential role of Epac2/Rap1 signaling in regulation of insulin granule dynamics by cAMP.
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PNAS
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98, 3568-3580
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Quantum dots provide an optical signal specific to full collapse fusion of synaptic vesicles.
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A. Rollenhagen, K. Satzler, E. P. Rodriguez, P. Jonas, M. Frotscher, and J. H. R. Lubke (2007)
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K. L. Rowley, C. B. Mantilla, L. G. Ermilov, and G. C. Sieck (2007)
J Neurophysiol
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Macroendocytosis and endosome processing in snake motor boutons.
The Ig cell adhesion molecule Basigin controls compartmentalization and vesicle release at Drosophila melanogaster synapses.
F. Besse, S. Mertel, R. J. Kittel, C. Wichmann, T. M. Rasse, S. J. Sigrist, and A. Ephrussi (2007)
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177, 843-855
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L. Tabares, R. Ruiz, P. Linares-Clemente, M. A. Gaffield, G. Alvarez de Toledo, R. Fernandez-Chacon, and W. J. Betz (2007)
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UNC-13 and UNC-10/Rim Localize Synaptic Vesicles to Specific Membrane Domains.
R. M. Weimer, E. O. Gracheva, O. Meyrignac, K. G. Miller, J. E. Richmond, and J.-L. Bessereau (2006)
J. Neurosci.
26, 8040-8047
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BDNF increases release probability and the size of a rapidly recycling vesicle pool within rat hippocampal excitatory synapses.
W. J. Tyler, X.-l. Zhang, K. Hartman, J. Winterer, W. Muller, P. K. Stanton, and L. Pozzo-Miller (2006)
J. Physiol.
574, 787-803
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Differential Sorting of the Vesicular Glutamate Transporter 1 into a Defined Vesicular Pool Is Regulated by Light Signaling Involving the Clock Gene Period2.
S. V. Yelamanchili, G. Pendyala, I. Brunk, M. Darna, U. Albrecht, and G. Ahnert-Hilger (2006)
J. Biol. Chem.
281, 15671-15679
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Synaptic vesicles in rat hippocampal boutons recycle to different pools in a use-dependent fashion.
Real-time imaging of Rab3a and Rab5a reveals differential roles in presynaptic function.
E. N. Star, A. J. Newton, and V. N. Murthy (2005)
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Exocytosis and endocytosis of small vesicles in PC12 cells studied with TEPIQ (two-photon extracellular polar-tracer imaging-based quantification) analysis.
T.-T. Liu, T. Kishimoto, H. Hatakeyama, T. Nemoto, N. Takahashi, and H. Kasai (2005)
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568, 917-929
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Vesicles in snake motor terminals comprise one functional pool and utilize a single recycling strategy at all stimulus frequencies.
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Levodopa-induced changes in synaptic dopamine levels increase with progression of Parkinson's disease: implications for dyskinesias.
R. de la Fuente-Fernandez, V. Sossi, Z. Huang, S. Furtado, J.-Q. Lu, D. B. Calne, T. J. Ruth, and A. J. Stoessl (2004)
Brain
127, 2747-2754
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Regulation of transmitter release by synapsin II in mouse motor terminals.
D. Samigullin, C. A Bill, W. L Coleman, and M. Bykhovskaia (2004)
J. Physiol.
561, 149-158
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Evidence that fast exocytosis can be predominantly mediated by vesicles not docked at active zones in frog saccular hair cells.
B. W Edmonds, F. D Gregory, and F. E Schweizer (2004)
J. Physiol.
560, 439-450
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Optical Postsynaptic Measurement of Vesicle Release Rates for Hippocampal Synapses Undergoing Asynchronous Release during Train Stimulation.
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M. Ohara-Imaizumi, A. K. Cardozo, T. Kikuta, D. L. Eizirik, and S. Nagamatsu (2004)
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Ceramidase Regulates Synaptic Vesicle Exocytosis and Trafficking.
J. Rohrbough, E. Rushton, L. Palanker, E. Woodruff, H. J. G. Matthies, U. Acharya, J. K. Acharya, and K. Broadie (2004)
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24, 7789-7803
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