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Kiss-and-run fusion is a type of synaptic … Kiss-and-run fusion is a type of synaptic vesicle release where the vesicle opens and closes transiently. In this form of exocytosis, the vesicle docks and transiently fuses at the presynaptic membrane and releases its neurotransmitters across the synapse, after which the vesicle can then be reused. Kiss-and-run differs from full fusion, where the vesicle collapses fully into the plasma membrane and is then later retrieved by a clathrin-coat-dependent process. The idea that neurotransmitter might be released in "quanta" by the fusion of synaptic vesicles with the presynaptic membrane was first introduced by Bernard Katz and Jose del Castillo in 1955, when the first EM images of nerve terminals first appeared. The possibility of transient fusion and rapid retrieval of vesicle membrane was proposed by Bruno Ceccarelli in 1973, after examining in the electron microscope strongly stimulated frog neuromuscular junctions, and indirectly supported by the work of his group in the following years, using electrophysiology, electron microscopy and quick freezing techniques. The actual term, kiss-and-run, was introduced by Ceccarelli's collaborators after the first studies of simultaneous membrane capacitance and amperometric transmitter release measurements were performed and indicated that secretory products could actually be released during transient vesicle fusion.Today, there is back and forth debate over full fusion and kiss-and-run fusion and which model portrays a more accurate picture of the mechanisms behind synaptic release. The increased accumulation of partially empty secretory vesicles following secretion, observed in electron micrographs are the most compelling evidence in favor of the kiss-and-run model. Accumulation of partially empty vesicles following secretion suggests that during the secretory process, only a portion of the vesicular contents are able to exit the cell, which could only be possible if secretory vesicles were to temporarily establish continuity with the cell plasma membrane, expel a portion of their contents, then detach and reseal.of their contents, then detach and reseal.
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Kiss-and-run fusion is a type of synaptic … Kiss-and-run fusion is a type of synaptic vesicle release where the vesicle opens and closes transiently. In this form of exocytosis, the vesicle docks and transiently fuses at the presynaptic membrane and releases its neurotransmitters across the synapse, after which the vesicle can then be reused.fter which the vesicle can then be reused.
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