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Article / Nature Neuroscience

AgRP Neurons Encode Circadian Feeding Time

Nilufer Sayar-Atasoy, Iltan Aklan, Yavuz Yavuz, Connor Laule, Hyojin Kim, Jacob Rysted, Muhammed Ikbal Alp, Debbie Davis, Bayram Yilmaz & Deniz Atasoy

Abstract

Food intake follows a predictable daily pattern and synchronizes metabolic rhythms. Neurons expressing agouti-related protein (AgRP) read out physiological energetic state and elicit feeding, but the regulation of these neurons across daily timescales is poorly understood. Using a combination of neuron dynamics measurements and timed optogenetic activation in mice, we show that daily AgRP-neuron activity was not fully consistent with existing models of homeostatic regulation. Instead of operating as a ‘deprivation counter’, AgRP-neuron activity primarily followed the circadian rest–activity cycle through a process that required an intact suprachiasmatic nucleus and synchronization by light. Imposing novel feeding patterns through time-restricted food access or periodic AgRP-neuron stimulation was sufficient to resynchronize the daily AgRP-neuron activity rhythm and drive anticipatory-like behavior through a process that required DMHPDYN neurons. These results indicate that AgRP neurons integrate time-of-day information of past feeding experience with current metabolic needs to predict circadian feeding time.

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