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Nilufer Sayar-Atasoy1, Iltan Aklan1, Yavuz Yavuz1,2

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Metabolism

Background:

  • Food intake follows daily patterns, synchronizing metabolic rhythms.
  • Agouti-related peptide (AgRP) neurons signal energy state and trigger feeding.
  • Regulation of AgRP neurons over daily timescales is not well understood.

Purpose of the Study:

  • Investigate the daily regulation of AgRP neuron activity.
  • Determine if AgRP neuron activity aligns with homeostatic regulation or circadian rhythms.
  • Understand the mechanisms by which feeding patterns influence AgRP neuron activity.

Main Methods:

  • Utilized neuron dynamics measurements in mice.
  • Employed timed optogenetic activation of AgRP neurons.
  • Manipulated feeding patterns using time-restricted food access.

Main Results:

  • AgRP neuron activity primarily followed the circadian rest-activity cycle, influenced by light.
  • AgRP neuron activity was not solely a 'deprivation counter'.
  • Novel feeding patterns and AgRP neuron stimulation resynchronized daily activity and drove anticipatory behaviors, requiring DMHPDYN neurons.

Conclusions:

  • AgRP neurons integrate circadian time, past feeding, and metabolic needs to predict feeding times.
  • Circadian timing and light synchronization are crucial for AgRP neuron regulation.
  • DMHPDYN neurons play a role in mediating anticipatory feeding behaviors driven by AgRP neuron activity.