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Strong preference for autaptic self-connectivity of neocortical PV interneurons facilitates their tuning to ?-oscillations.


ABSTRACT: Parvalbumin (PV)-positive interneurons modulate cortical activity through highly specialized connectivity patterns onto excitatory pyramidal neurons (PNs) and other inhibitory cells. PV cells are autoconnected through powerful autapses, but the contribution of this form of fast disinhibition to cortical function is unknown. We found that autaptic transmission represents the most powerful inhibitory input of PV cells in neocortical layer V. Autaptic strength was greater than synaptic strength onto PNs as a result of a larger quantal size, whereas autaptic and heterosynaptic PV-PV synapses differed in the number of release sites. Overall, single-axon autaptic transmission contributed to approximately 40% of the global inhibition (mostly perisomatic) that PV interneurons received. The strength of autaptic transmission modulated the coupling of PV-cell firing with optogenetically induced ?-oscillations, preventing high-frequency bursts of spikes. Autaptic self-inhibition represents an exceptionally large and fast disinhibitory mechanism, favoring synchronization of PV-cell firing during cognitive-relevant cortical network activity.

SUBMITTER: Deleuze C 

PROVIDER: S-EPMC6726197 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Strong preference for autaptic self-connectivity of neocortical PV interneurons facilitates their tuning to γ-oscillations.

Deleuze Charlotte C   Bhumbra Gary S GS   Pazienti Antonio A   Lourenço Joana J   Mailhes Caroline C   Aguirre Andrea A   Beato Marco M   Bacci Alberto A  

PLoS biology 20190904 9


Parvalbumin (PV)-positive interneurons modulate cortical activity through highly specialized connectivity patterns onto excitatory pyramidal neurons (PNs) and other inhibitory cells. PV cells are autoconnected through powerful autapses, but the contribution of this form of fast disinhibition to cortical function is unknown. We found that autaptic transmission represents the most powerful inhibitory input of PV cells in neocortical layer V. Autaptic strength was greater than synaptic strength ont  ...[more]

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