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Basolateral amygdala neuropeptide Y system modulates binge ethanol consumption.

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Neuropeptide Y (NPY) in the basolateral amygdala (BLA) impacts male ethanol intake. Binge drinking reduces NPY1R expression in the BLA, and inhibiting BLA to mPFC projections reduces binge-like ethanol consumption in both sexes.

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Area of Science:

  • Neuroscience
  • Neurobiology
  • Addiction Research

Background:

  • Neuropeptide Y (NPY) signaling regulates corticolimbic pathways involved in alcohol consumption.
  • The basolateral amygdala (BLA) and its projections play a crucial role in modulating reward-seeking behaviors, including ethanol intake.
  • Understanding the specific roles of NPY and its receptors within the BLA is essential for developing targeted addiction therapies.

Purpose of the Study:

  • To investigate the effect of intra-BLA NPY administration on binge-like ethanol consumption.
  • To examine how repeated binge-like ethanol intake alters NPY receptor 1 (NPY1R) expression in the BLA.
  • To determine the involvement of BLA to medial prefrontal cortex (mPFC) NPY1R+ projections in binge-like ethanol intake.

Main Methods:

  • Utilized the "drinking-in-the-dark" (DID) paradigm in C57BL6J mice.
  • Administered NPY directly into the BLA to assess its impact on ethanol intake.
  • Employed immunohistochemistry (IHC) to measure NPY1R expression levels in the BLA after DID exposure.
  • Used chemogenetics to selectively inhibit NPY1R+ projections from the BLA to the mPFC.

Main Results:

  • Intra-BLA NPY administration dose-dependently decreased binge-like ethanol intake in male mice only.
  • Repeated DID exposure led to reduced NPY1R expression in the BLA of both male and female mice.
  • Chemogenetic silencing of BLA→mPFC NPY1R+ neurons significantly attenuated binge-like ethanol intake in a dose-dependent manner in both sexes.

Conclusions:

  • Intra-BLA NPY administration modulates binge-like ethanol intake, with sex-specific effects observed in males.
  • Binge-like ethanol consumption is associated with decreased NPY1R expression within the BLA.
  • The NPY1R+ pathway connecting the BLA to the mPFC is critically involved in regulating binge-like ethanol consumption across both sexes.