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Addiction Biology
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Addiction Biology
Article . 2017 . Peer-reviewed
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Inhibition of fatty acid amide hydrolase in the central amygdala alleviates co‐morbid expression of innate anxiety and excessive alcohol intake

Authors: Serena Stopponi; Yannick Fotio; Ana Domi; Anna Maria Borruto; Luis Natividad; Marisa Roberto; Roberto Ciccocioppo; +1 Authors

Inhibition of fatty acid amide hydrolase in the central amygdala alleviates co‐morbid expression of innate anxiety and excessive alcohol intake

Abstract

AbstractFatty acid amide hydrolase (FAAH) is an enzyme that prominently degrades the major endocannabinoid N‐arachidonoylethanolamine (anandamide). Inhibition of this enzyme leads to increased anandamide levels in brain regions that modulate stress and anxiety. Recently, we found that genetically selected Marchigian Sardinian alcohol‐preferring (msP) rats display hyperactive FAAH in amygdalar regions that was associated with increased stress sensitivity and a hyper‐anxious phenotype. Our previous work has also demonstrated that msPs display an innate preference for and excessive consumption of alcohol, potentially reflecting a form of self‐medication to gain relief from hyper‐anxious states. Here, we expand on our previous work by microinjecting the selective FAAH inhibitor URB597 (vehicle, 0.03, 0.1 and 1.0 μg per rat) into the central amygdala (CeA) and basolateral amygdala in msP versus non‐selected Wistar rats to evaluate the effects of localized FAAH inhibition on operant alcohol self‐administration and restraint‐induced anxiety using the elevated plus maze. Intra‐CeA URB597 significantly reduced alcohol self‐administration in msP but not in Wistar rats. Intra‐basolateral amygdala URB597 also attenuated alcohol drinking in msPs, although the effect was less pronounced relative to CeA treatment. In contrast, control experiments administering URB597 into the ventral tegmental area produced no genotypic differences in drinking. We also found that URB597 treatment in the CeA significantly reduced the anxiogenic effects of restraint stress in msPs, although no effects were detected in Wistars. Dysregulation of FAAH regulated systems in the major output region of the amygdala may drive the propensity for co‐morbid expression of anxiety and excessive alcohol use.

Country
Italy
Keywords

Male, Restraint, Physical, Analysis of Variance, Ethanol, Microinjections, Central Amygdaloid Nucleus, Central Nervous System Depressants, Rats, Inbred Strains, Self Administration, Anxiety Disorders, Amidohydrolases, Alcoholism, Benzamides, Animals, Conditioning, Operant, Carbamates, Enzyme Inhibitors, Rats, Wistar, Maze Learning, Stress, Psychological

  • BIP!
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    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    36
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
36
Top 10%
Average
Top 10%
bronze