Gap Junctions Link Regular-Spiking and Fast-Spiking Interneurons in Layer 5 Somatosensory Cortex

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Hatch , R J , Mendis , G D C , Kaila , K , Reid , C A & Petrou , S 2017 , ' Gap Junctions Link Regular-Spiking and Fast-Spiking Interneurons in Layer 5 Somatosensory Cortex ' , Frontiers in Cellular Neuroscience , vol. 11 , 204 . https://doi.org/10.3389/fncel.2017.00204

Title: Gap Junctions Link Regular-Spiking and Fast-Spiking Interneurons in Layer 5 Somatosensory Cortex
Author: Hatch, Robert J.; Mendis, G. Dulini C.; Kaila, Kai; Reid, Christopher A.; Petrou, Steven
Contributor: University of Helsinki, Biosciences
Date: 2017-07-17
Language: eng
Number of pages: 10
Belongs to series: Frontiers in Cellular Neuroscience
ISSN: 1662-5102
URI: http://hdl.handle.net/10138/206650
Abstract: Gap junctions form electrical synapses that modulate neuronal activity by synchronizing action potential (AP) firing of cortical interneurons (INs). Gap junctions are thought to form predominantly within cortical INs of the same functional class and are therefore considered to act within discrete neuronal populations. Here, we challenge that view and show that the probability of electrical coupling is the same within and between regularspiking (RS) and fast-spiking (FS) cortical INs in 16-21 days old mice. Firing properties of these two populations were distinct from other INs types including neurogliaform and low-threshold spiking (LTS) cells. We also demonstrate that pre-junctional APs can depolarize post-junctional neurons and increase the probability of firing. Our findings of frequent gap junction coupling between functionally distinct IN subtypes suggest that cortical IN networks are much more extensive and heterogeneous than previously thought. This may have implications on mechanisms ranging from cognitive functions to modulation of pathological states in epilepsy and other neurological disorders.
Subject: gap junctions
electrophysiology
interneurons
cortex
fast-spiking
regular-spiking
RAT FRONTAL-CORTEX
INHIBITORY INTERNEURONS
CORTICAL INTERNEURONS
ELECTRICAL SYNAPSES
NEUROGLIAFORM CELLS
GABAERGIC SYNAPSES
MOUSE NEOCORTEX
CEREBRAL-CORTEX
NEURONS
BRAIN
3112 Neurosciences
3124 Neurology and psychiatry
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