title: Control of neurotransmitter release: From Ca2+ to voltage dependent G-protein coupled receptors.
abstract: This review discusses two theories that try to explain mechanisms of control of neurotransmitter release in fast synapses: the Ca(2+) hypothesis and the Ca(2+) voltage hypothesis. The review summarizes experimental results that are incompatible with predictions from the Ca(2+) hypothesis and concludes that Ca(2+) is involved in the control of the amount of release but not in the control of the time course of evoked release, i.e., initiation and termination of evoked release. Results summarizing direct effects of changes in membrane potential on the release machinery are then presented. These changes in membrane potential affect the affinity (for the transmitter) of presynaptic autoinhibitory G-protein coupled receptors (GPCRs). The voltage dependence of these GPCRs and their pivotal role in determining the time course of evoked release is discussed.
authors.affiliation: Department of Neurobiology, Institute of life Science, The Hebrew University, Edmon Safra Campus, Jerusalem, Israel. parnas@huji.ac.il
authors.forename: Itzchak
authors.initials: I
authors.lastname: Parnas
authors.forename: Hanna
authors.initials: H
authors.lastname: Parnas
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002118:Calcium / Q000378:metabolism* / Q000494:pharmacology; D015220:Calcium Channels / Q000502:physiology; D008564:Membrane Potentials / Q000187:drug effects; D008954:Models, Biological; D018377:Neurotransmitter Agents / Q000378:metabolism*; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism*; D013569:Synapses / Q000378:metabolism*
chemical_list: D015220:Calcium Channels; D018377:Neurotransmitter Agents; D043562:Receptors, G-Protein-Coupled; D002118:Calcium
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