Basolateral amygdala neuropeptide Y system modulates binge ethanol consumption.

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.