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Neuron. 2019 Mar 26. pii: S0896-6273(19)30218-1. doi: 10.1016/j.neuron.2019.03.011. [Epub ahead of print]

A Role of Drd2 Hippocampal Neurons in Context-Dependent Food Intake.

Author information

1
Laboratory of Molecular Genetics, The Rockefeller University, New York, NY 10065, USA.
2
Laboratory of Molecular Neuroscience, The Rockefeller University, New York, NY 10065, USA.
3
Center for Clinical and Translational Science, The Rockefeller University, New York, NY 10065, USA.
4
Laboratory of Molecular Genetics, The Rockefeller University, New York, NY 10065, USA. Electronic address: friedj@rockefeller.edu.

Abstract

Associative learning of food cues that link location in space to food availability guides feeding behavior in mammals. However, the function of specific neurons that are elements of the higher-order, cognitive circuitry controlling feeding behavior is largely unexplored. Here, we report that hippocampal dopamine 2 receptor (hD2R) neurons are specifically activated by food and that both acute and chronic modulation of their activity reduces food intake in mice. Upstream projections from the lateral entorhinal cortex (LEC) to the hippocampus activate hD2R cells and can also decrease food intake. Finally, activation of hD2R neurons interferes with the encoding of a spatial memory linking food to a specific location via projections from the hippocampus to the septal area. Altogether these data describe a previously unidentified LEC > hippocampus > septal higher-order circuit that regulates feeding behavior.

KEYWORDS:

dopamine receptor 2; feeding; food intake; hippocampus; memory; optogenetics

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