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J Neurosci. 2016 Jan 13;36(2):302-11. doi: 10.1523/JNEUROSCI.1202-15.2016.

Lateral Hypothalamic Area Glutamatergic Neurons and Their Projections to the Lateral Habenula Regulate Feeding and Reward.

Author information

1
Departments of Psychiatry and Cell Biology and Physiology, Curriculum in Neurobiology, and.
2
Departments of Psychiatry and Cell Biology and Physiology, Master program Neuroscience and Cognition, Brain Center Rudolf Magnus, Department of Transitional Neuroscience, University Medical Center Utrecht, Utrecht 3584 CX, The Netherlands.
3
Departments of Psychiatry and Cell Biology and Physiology.
4
Departments of Psychiatry and Cell Biology and Physiology, Curriculum in Neurobiology, and Neuroscience Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, and gstuber@med.unc.edu.

Abstract

The overconsumption of calorically dense, highly palatable foods is thought to be a major contributor to the worldwide obesity epidemic; however, the precise neural circuits that directly regulate hedonic feeding remain elusive. Here, we show that lateral hypothalamic area (LHA) glutamatergic neurons, and their projections to the lateral habenula (LHb), negatively regulate the consumption of palatable food. Genetic ablation of LHA glutamatergic neurons increased daily caloric intake and produced weight gain in mice that had access to a high-fat diet, while not altering general locomotor activity. Anterior LHA glutamatergic neurons send a functional glutamatergic projection to the LHb, a brain region involved in processing aversive stimuli and negative reward prediction outcomes. Pathway-specific, optogenetic stimulation of glutamatergic LHA-LHb circuit resulted in detectable glutamate-mediated EPSCs as well as GABA-mediated IPSCs, although the net effect of neurotransmitter release was to increase the firing of most LHb neurons. In vivo optogenetic inhibition of LHA-LHb glutamatergic fibers produced a real-time place preference, whereas optogenetic stimulation of LHA-LHb glutamatergic fibers had the opposite effect. Furthermore, optogenetic inhibition of LHA-LHb glutamatergic fibers acutely increased the consumption of a palatable liquid caloric reward. Collectively, these results demonstrate that LHA glutamatergic neurons are well situated to bidirectionally regulate feeding and potentially other behavioral states via their functional circuit connectivity with the LHb and potentially other brain regions.

SIGNIFICANCE STATEMENT:

In this study, we show that the genetic ablation of LHA glutamatergic neurons enhances caloric intake. Some of these LHA glutamatergic neurons project to the lateral habenula, a brain area important for generating behavioral avoidance. Optogenetic stimulation of this circuit has net excitatory effects on postsynaptic LHb neurons. This is the first study to characterize the functional connectivity and behavioral relevance of this circuit within the context of feeding and reward-related behavior.

KEYWORDS:

aversion; feeding; habenula; hypothalamus; optogenetics; reward

PMID:
26758824
PMCID:
PMC4710762
DOI:
10.1523/JNEUROSCI.1202-15.2016
[Indexed for MEDLINE]
Free PMC Article

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