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• W2079459056 abstract "Voltage-dependent changes in electrical coupling are often attributed to a direct effect on the properties of gap junction channels. Identifiable auditory afferents terminate as mixed (electrical and chemical) synapses on the distal portion of the lateral dendrite of the goldfish Mauthner cells, a pair of large reticulospinal neurons involved in the organization of sensory-evoked escape responses. At these afferents, the amplitude of the coupling potential produced by the retrograde spread of signals from the postsynaptic Mauthner cell is dramatically enhanced by depolarization of the presynaptic terminal. We demonstrate here that this voltage-dependent enhancement of electrical coupling does not represent a property of the junctions themselves but the activation of a subthreshold sodium current present at presynaptic terminals that acts to amplify the synaptic response. We also provide evidence that this amplification operates under physiological conditions, enhancing synaptic communication from the Mauthner cells to the auditory afferents where electrical and geometrical properties of the coupled cells are unfavorable for retrograde transmission. Retrograde electrical communication at these afferents may play an important functional role by promoting cooperativity between afferents and enhancing transmitter release. Thus, the efficacy of an electrical synapse can be dynamically modulated in a voltage-dependent manner by properties of the nonjunctional membrane. Finally, asymmetric amplification of electrical coupling by intrinsic membrane properties, as at the synapses between auditory afferents and the Mauthner cell, may ensure efficient communication between neuronal processes of dissimilar size and shape, promoting neuronal synchronization." @default.
• W2079459056 created "2016-06-24" @default.
• W2079459056 creator A5015110091 @default.
• W2079459056 creator A5083604135 @default.
• W2079459056 date "2004-04-21" @default.
• W2079459056 modified "2023-09-27" @default.
• W2079459056 title "Voltage-Dependent Enhancement of Electrical Coupling by a Subthreshold Sodium Current" @default.
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• W2079459056 doi "https://doi.org/10.1523/jneurosci.0077-04.2004" @default.
• W2079459056 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6729423" @default.
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