Journal
NEURON
Volume 90, Issue 4, Pages 810-823Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2016.04.013
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Funding
- Human Frontier Science Program Organization
- Gatsby Charitable Foundation
- European Research Council
- Wellcome Trust
- European Commission (FP7)
- European Commission (Eurospin)
- Grants-in-Aid for Scientific Research [25118009] Funding Source: KAKEN
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Many GABAergic interneurons are electrically coupled and in vitro can display correlated activity with millisecond precision. However, the mechanisms underlying correlated activity between interneurons in vivo are unknown. Using dual patch-clamp recordings in vivo, we reveal that in the presence of spontaneous background synaptic activity, electrically coupled cerebellar Golgi cells exhibit robust millisecond precision-correlated activity which is enhanced by sensory stimulation. This precisely correlated activity results from the cooperative action of two mechanisms. First, electrical coupling ensures slow subthreshold membrane potential correlations by equalizing membrane potential fluctuations, such that coupled neurons tend to approach action potential threshold together. Second, fast spike-triggered spikelets transmitted through gap junctions conditionally trigger postjunctional spikes, depending on both neurons being close to threshold. Electrical coupling therefore controls the temporal precision and degree of both spontaneous and sensory-evoked correlated activity between interneurons, by the cooperative effects of shared synaptic depolarization and spikelet transmission.
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