Comment; More basic bench research information coming in pointing toward possible ways to interrupt alcohol consumption reward stimulation pathways. Deep brain stimulation to help chronic alcoholics anyone? Pharmaceutical approaches? Perhaps antibodies against those receptors?
María Luisa Torruella-Suárez, Jessica R. Vandenberg, Elizabeth S. Cogan, Gregory J. Tipton, Adonay Teklezghi, Kedar Dange, Gunjan K. Patel, Jenna A. McHenry, J. Andrew Hardaway, Pranish A. Kantak, Nicole A. Crowley, Jeffrey F. DiBerto, Sara P. Faccidomo, Clyde W. Hodge, Garret D. Stuber and Zoé A. McElligottJournal of Neuroscience 19 November 2019, 1466-19; DOI: https://doi.org/10.1523/JNEUROSCI.1466-19.2019
Abstract
The central nucleus of the amygdala plays a significant role in alcohol use and other affective disorders; however, the genetically-defined neuronal subtypes and their projections that govern these behaviors are not well known. Here we show that neurotensin neurons in the central nucleus of the amygdala of male mice are activated by in vivo ethanol consumption and that genetic ablation of these neurons decreases ethanol consumption and preference in non-ethanol dependent animals. This ablation did not impact preference for sucrose, saccharin, or quinine. We found that the most robust projection of the central amygdala neurotensin neurons was to the parabrachial nucleus, a brain region known to be important in feeding behaviors, conditioned taste aversion, and alarm. Optogenetic stimulation of projections from these neurons to the parabrachial nucleus is reinforcing, and increases ethanol drinking as well as consumption of sucrose and saccharin solutions. These data suggest that this central amygdala to parabrachial nucleus projection influences the expression of reward-related phenotypes and is a novel circuit promoting consumption of ethanol and palatable fluids.
SIGNIFICANCE STATEMENT
Alcohol use disorder (AUD) is a major health burden worldwide. While ethanol consumption is required for the development of AUD, much remains unknown regarding the underlying neural circuits that govern initial ethanol intake. Here we show that ablation of a population of neurotensin-expressing neurons in the central amygdala decreases intake of and preference for ethanol in non-dependent animals, while the projection of these neurons to the parabrachial nucleus promotes consumption of ethanol as well as other palatable fluids.
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