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Differential modulation of short-term synaptic dynamics by long-term potentiation at mouse hippocampal mossy fibre synapses

Item Type:Article
Title:Differential modulation of short-term synaptic dynamics by long-term potentiation at mouse hippocampal mossy fibre synapses
Creators Name:Gundlfinger, A., Leibold, C., Gebert, K., Moisel, M., Schmitz, D. and Kempter, R.
Abstract:Synapses continuously experience short- and long-lasting activity-dependent changes in synaptic strength. Long-term plasticity refers to persistent alterations in synaptic efficacy, whereas short-term plasticity (STP) reflects the instantaneous and reversible modulation of synaptic strength in response to varying presynaptic stimuli. The hippocampal mossy fibre synapse onto CA3 pyramidal cells is known to exhibit both a presynaptic, NMDA receptor-independent form of long-term potentiation (LTP) and a pronounced form of STP. A detailed description of their exact interdependence is, however, lacking. Here, using electrophysiological and computational techniques, we have developed a descriptive model of transmission dynamics to quantify plasticity at the mossy fibre synapse. STP at this synapse is best described by two facilitatory processes acting on time-scales of a few hundred milliseconds and about 10 s. We find that these distinct types of facilitation are differentially influenced by LTP such that the impact of the fast process is weakened as compared to that of the slow process. This attenuation is reflected by a selective decrease of not only the amplitude but also the time constant of the fast facilitation. We henceforth argue that LTP, involving a modulation of parameters determining both amplitude and time course of STP, serves as a mechanism to adapt the mossy fibre synapse to its temporal input.
Keywords:Algorithms, Calcium, Electric Stimulation, Electrophysiology, Excitatory Postsynaptic Potentials, Hippocampal Mossy Fibers, Long-Term Potentiation, Magnesium, Neurological Models, Patch-Clamp Techniques, Pyramidal Cells, Synapses, Synaptic Transmission, Animals, Mice
Source:Journal of Physiology
Publisher:Blackwell Publishing
Number:Pt 3
Page Range:853-865
Date:15 December 2007
Official Publication:https://doi.org/10.1113/jphysiol.2007.143925
PubMed:View item in PubMed

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