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Area of Science:

  • Neuroscience
  • Pharmacology
  • Addiction Research

Background:

  • Opioid use disorder (OUD) is a chronic relapsing disease with limited treatment options, necessitating novel therapeutic targets.
  • Current OUD treatments primarily target the µ-opioid receptor, often causing side effects that limit efficacy.
  • Calcitonin gene-related peptide (CGRP) neurons in the parabrachial nucleus (PBN) are implicated in modulating various behaviors, including those relevant to addiction.

Purpose of the Study:

  • To investigate the role of CGRP-expressing neurons in the PBN (CGRP PBN neurons) in regulating opioid reinforcement and seeking.
  • To explore the sensitivity of CGRP PBN neurons to opioid administration and their potential as novel therapeutic targets for OUD.

Main Methods:

  • Generated a baseline transcriptome of CGRP PBN neurons using cell-specific nuclear labeling and RNA-sequencing.
  • Assessed CGRP PBN neuron activity during morphine abstinence using cFos immunostaining.
  • Utilized chemogenetics in a mouse model of morphine intravenous self-administration to inhibit CGRP PBN neuron activity and measure its effects on drug intake and seeking.

Main Results:

  • CGRP PBN neurons express genes related to appetitive behaviors and the µ-opioid receptor, indicating sensitivity to opioids.
  • Morphine abstinence increased CGRP PBN neuron activity, which gradually decreased over 48 hours.
  • Chemogenetic inhibition of CGRP PBN neurons significantly reduced morphine intake but did not affect long-term, context-induced morphine seeking.

Conclusions:

  • CGRP PBN neurons are sensitive to opioid administration and play a crucial role in regulating the appetitive aspects of morphine intake.
  • Targeting CGRP neurotransmission, independent of direct µ-opioid receptor engagement, offers a promising novel therapeutic strategy for OUD.
  • These findings highlight CGRP PBN neurons as potential targets for developing non-opioid-based treatments for opioid use disorder.