An inhibitory pull-push circuit in frontal cortex

Nat Neurosci. 2017 Mar;20(3):389-392. doi: 10.1038/nn.4483. Epub 2017 Jan 23.

Abstract

Push-pull is a canonical computation of excitatory cortical circuits. By contrast, we identify a pull-push inhibitory circuit in frontal cortex that originates in vasoactive intestinal polypeptide (VIP)-expressing interneurons. During arousal, VIP cells rapidly and directly inhibit pyramidal neurons; VIP cells also indirectly excite these pyramidal neurons via parallel disinhibition. Thus, arousal exerts a feedback pull-push influence on excitatory neurons-an inversion of the canonical push-pull of feedforward input.

MeSH terms

  • Animals
  • Arousal / physiology
  • Channelrhodopsins
  • Feedback, Physiological / physiology*
  • Female
  • Frontal Lobe / physiology*
  • Interneurons / metabolism
  • Interneurons / physiology*
  • Locomotion / physiology
  • Male
  • Mice
  • Mice, Transgenic
  • Neural Inhibition / physiology*
  • Pupil / physiology
  • Pyramidal Cells / physiology
  • Vasoactive Intestinal Peptide / genetics
  • Vasoactive Intestinal Peptide / metabolism
  • Vasoactive Intestinal Peptide / physiology*

Substances

  • Channelrhodopsins
  • Vasoactive Intestinal Peptide