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Cortical interneurons that specialize in disinhibitory control.

Hyun-Jae Pi1, Balázs Hangya, Duda Kvitsiani

  • 1Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, New York 11724, USA.

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Summary
This summary is machine-generated.

Vasoactive intestinal polypeptide (VIP) interneurons in the cortex provide disinhibition by suppressing other inhibitory neurons. Their activation by reinforcement signals enhances neural processing and computational functions.

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Computational Neuroscience

Background:

  • The mammalian cerebral cortex utilizes diverse interneuron subtypes for inhibitory control.
  • Disinhibition, mediated by inhibitory neurons suppressing other inhibitory neurons, may play key roles in gating and gain modulation.
  • The specific interneurons specializing in disinhibition and their in vivo functions remain largely uncharacterized.

Purpose of the Study:

  • To identify and characterize interneurons that specialize in disinhibitory control within the neocortex.
  • To investigate the in vivo function of these disinhibitory interneurons, particularly vasoactive intestinal polypeptide (VIP)-expressing neurons.
  • To elucidate the circuit mechanisms and behavioral relevance of VIP-mediated disinhibition.

Main Methods:

  • Optogenetic activation combined with single-cell recordings in awake mice.
  • In vitro electrophysiological recordings in auditory and medial prefrontal cortices.
  • Behavioral experiments involving an auditory discrimination task.

Main Results:

  • VIP interneurons were identified as mediators of disinhibitory control across multiple cortical areas.
  • A disinhibitory circuit module was revealed where VIP neurons suppress somatostatin- and parvalbumin-expressing interneurons.
  • Reinforcement signals (reward/punishment) during an auditory task strongly activated VIP neurons, increasing principal neuron gain.

Conclusions:

  • VIP interneurons represent a distinct cell type mediating disinhibitory control in the cortex.
  • This disinhibitory circuit is dynamically recruited by reinforcement signals during specific behavioral conditions.
  • VIP-mediated disinhibition contributes to adaptive neural processing and computation in the cortex.