VTA µ-Opioidergic Neurons Facilitate Low Sociability in Protracted Opioid Abstinence
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View abstract on PubMed
Summary
This summary is machine-generated.Protracted opioid abstinence causes negative feelings and social deficits. Ventral tegmental area (VTA) neurons expressing μ-opioid receptors (MORs) are key to these social issues, offering a potential target for treatment.
Area Of Science
- Neuroscience
- Neurobiology
- Addiction Research
Background
- Opioid use disorder (OUD) is characterized by chronic exposure leading to brain circuit maladaptation.
- Protracted abstinence from opioids involves persistent negative affective states (anxiety, dysphoria, anhedonia), increasing relapse risk.
- The ventral tegmental area (VTA) and its μ-opioid receptors (MORs) are crucial for opioid reinforcement, but their role in protracted abstinence is unclear.
Purpose Of The Study
- To investigate the specific role of VTA<sup>MOR</sup> neurons in mediating negative affect and altered brain activity during protracted opioid abstinence.
- To identify the contribution of VTA<sup>MOR</sup> neurons to social deficits and other behavioral changes following opioid cessation.
Main Methods
- Utilized a chronic oral morphine administration model in male and female mice.
- Assessed social interaction, anxiety-related, and despair-like behaviors during protracted forced abstinence.
- Employed viral techniques to re-express MORs selectively in VTA<sup>MOR</sup> neurons of MOR knock-out mice.
- Measured neuronal activation (FOS) in VTA<sup>MOR</sup> neurons and the anterior cingulate cortex (ACC).
Main Results
- Chronic morphine exposure and abstinence led to increased social deficits, anxiety, and despair-like behaviors.
- VTA<sup>MOR</sup> neurons exhibited heightened FOS activation during withdrawal and project to reward/affect circuits.
- Selective re-expression of MORs in VTA<sup>MOR</sup> neurons rescued disrupted social interaction but not other abstinence behaviors.
- VTA<sup>MORs</sup> modulated heightened FOS activation in the ACC following acute morphine challenge.
Conclusions
- VTA<sup>MOR</sup> neurons are critical modulators of social behavior deficits during protracted opioid abstinence.
- These neurons represent a potential therapeutic target for alleviating negative affective symptoms associated with opioid abstinence.
- VTA<sup>MOR</sup> neurons uniquely influence ACC neuronal activity, suggesting specific circuit roles in opioid effects.
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