Revisión en Neurociencia

Short-term synaptic plasticity

A. Colino, J. Muñoz-Cuevas, H. Vara [REV NEUROL 2002;34:593-599] PMID: 12040507 DOI: https://doi.org/10.33588/rn.3406.2002165

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Volumen 34 | Number 06 | Nº of views of the article 33.727 | Nº of PDF downloads 1.846 | Article publication date 16/03/2002

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ABSTRACT

INTRODUCTION At many chemical synapses, the amount of transmitter released by each action potential can increase or decrease markedly after the onset of specific temporal patterns of activity. OBJECTIVEs. This review focuses on mechanisms and functions of shortterm presynaptic plasticity that last from milliseconds to minutes. The short term enhancement of neurotransmitter release is due to three calciumdependent presynaptic processes differing in their durations: about one second or less (facilitation), about 30 seconds (augmentation) and several minutes (posttetanic potentiation). These forms of shortterm potentiation are usually attributed to a transient elevation in presynaptic calcium ions (Ca2+) concentration following the arrival of the action potential. Otherwise, presynaptic depression processes, as well as the facilitation ones, depend on neurotransmitter release probability. Thus, synapses with high release probability show few facilitation and are easily depressed because of their ability to deplete faster all synaptic vesicles of the ready releasable pool.

CONCLUSIONS Shortterm synaptic plasticity appears to serve as a flexible mechanism for temporal information processing in higher cortical integration. KeywordsAugmentation Calcium Depression Facilitation Posttetanic potentiation Synapse CategoriesNeurociencia básica Neuropsiquiatría

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Revisión en Neurociencia

Short-term synaptic plasticity