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

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    Author
    Hatch, RJ; Mendis, GDC; Kaila, K; Reid, CA; Petrou, S
    Date
    2017-07-17
    Source Title
    Frontiers in Cellular Neuroscience
    Publisher
    FRONTIERS MEDIA SA
    University of Melbourne Author/s
    Petrou, Steven; Reid, Christopher; Hatch, Robert; Mendis, Gunarathna Dulini Chathurika
    Affiliation
    Florey Department of Neuroscience and Mental Health
    Medicine and Radiology
    Metadata
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    Document Type
    Journal Article
    Citations
    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, 11, https://doi.org/10.3389/fncel.2017.00204.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/256565
    DOI
    10.3389/fncel.2017.00204
    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 regular-spiking (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.

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