title: Desynchronization of multivesicular release enhances Purkinje cell output.
abstract: The release of neurotransmitter-filled vesicles after action potentials occurs with discrete time courses: submillisecond phasic release that can be desynchronized by activity followed by "delayed release" that persists for tens of milliseconds. Delayed release has a well-established role in synaptic integration, but it is not clear whether desynchronization of phasic release has physiological consequences. At the climbing fiber to Purkinje cell synapse, the synchronous fusion of multiple vesicles is critical for generating complex spikes. Here we show that stimulation at physiological frequencies drives the temporal dispersion of vesicles undergoing multivesicular release, resulting in a slowing of the EPSC on the millisecond timescale. Remarkably, these changes in EPSC kinetics robustly alter the Purkinje cell complex spike in a manner that promotes axonal propagation of individual spikelets. Thus, desynchronization of multivesicular release enhances the precise and efficient information transfer by complex spikes.
authors.affiliation: Department of Biology, University of Freiburg, 79104 Freiburg, Germany.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Rudolph
authors.forename: Linda
authors.initials: L
authors.lastname: Overstreet-Wadiche
authors.forename: Jacques I
authors.initials: JI
authors.lastname: Wadiche
mesh_terms: D000200:Action Potentials / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D000831:Animals, Newborn; D001224:Aspartic Acid / Q000494:pharmacology; D055592:Biophysical Phenomena / Q000502:physiology*; D002118:Calcium / Q000378:metabolism; D002531:Cerebellum / Q000166:cytology*; D004558:Electric Stimulation / Q000379:methods; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology; D018698:Glutamic Acid / Q000378:metabolism; D066298:In Vitro Techniques; D007736:Kynurenic Acid / Q000494:pharmacology; D016014:Linear Models; D051379:Mice; D009412:Nerve Fibers / Q000502:physiology; D009415:Nerve Net / Q000187:drug effects / Q000502:physiology*; D018408:Patch-Clamp Techniques / Q000379:methods; D011689:Purkinje Cells / Q000187:drug effects / Q000378:metabolism*; D011810:Quinoxalines / Q000494:pharmacology; D013324:Strontium / Q000494:pharmacology; D013569:Synapses / Q000378:metabolism; D013997:Time Factors
chemical_list: D018691:Excitatory Amino Acid Antagonists; D011810:Quinoxalines; C120673:benzyloxyaspartate; C062865:2,3-dioxo-6-nitro-7-sulfamoylbenzo(f)quinoxaline; D001224:Aspartic Acid; D018698:Glutamic Acid; D007736:Kynurenic Acid; D002118:Calcium; D013324:Strontium