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Ventral pallidal perineuronal nets regulate opioid relapse.

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Summary
This summary is machine-generated.

Perineuronal nets (PNNs) in the ventral pallidum (VP) drive opioid seeking. Targeting VP PNNs may offer new treatments for opioid use disorder and relapse.

Keywords:
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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Addiction Research

Background:

  • Opioid use disorder is a significant global health issue.
  • Ventral pallidum (VP) neuronal activity influences opioid reward and relapse.
  • Parvalbumin (PV) neurons in the VP are implicated in drug relapse.
  • Perineuronal nets (PNNs) ensheath PV neurons, regulating their activity and plasticity.

Purpose of the Study:

  • To investigate the role of PNNs in VP parvalbumin (PV) neurons.
  • To determine if PNNs in the VP are altered by opioid exposure.
  • To examine the impact of PNNs on opioid seeking behavior and relapse.

Main Methods:

  • Heroin self-administration in male and female mice.
  • Assessment of PNN density in the VP.
  • Enzymatic degradation of PNNs using chondroitinase ABC.
  • Electrophysiological recordings of VP PV neurons.
  • Chemogenetic manipulation of VP PV neuron activity.
  • Measurement of Fos expression as a marker of neuronal activity.

Main Results:

  • Heroin self-administration increased PNN density in the VP.
  • Chondroitinase ABC treatment prevented cue-induced heroin seeking.
  • VP PNN depletion reduced VP PV neuron excitability and potentiated inhibitory inputs.
  • PNN depletion diminished Fos expression in VP PV neurons during relapse.
  • Chemogenetic activation of VP PV neurons rescued the suppressive effect of PNN depletion.

Conclusions:

  • VP PV neurons and their associated PNNs are critical for opioid seeking.
  • PNNs regulate the neurophysiology of VP PV neurons.
  • Targeting VP PNNs represents a potential therapeutic strategy for opioid use disorder.
  • PNNs' role in neural plasticity suggests therapeutic potential for addiction treatment.