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Heroin Regulates Orbitofrontal Circular RNAs.

Gabriele Floris1,2, Aria Gillespie1,2, Mary Tresa Zanda1,2

  • 1Center for Substance Abuse Research, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA.

International Journal of Molecular Sciences
|February 15, 2022
PubMed
Summary
This summary is machine-generated.

Heroin alters circular RNAs (circRNAs) in the rat orbitofrontal cortex, a brain region involved in reward. These changes may contribute to opioid use disorder neuroadaptations.

Keywords:
circular RNAnoncoding RNAopioidsself-administration

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Opioid use disorder (OUD) presents a significant public health challenge, with rising overdose deaths.
  • Relapse remains common in treated patients, highlighting the need for better therapeutic strategies.
  • Understanding the neurobiological adaptations underlying persistent opioid seeking is crucial for developing new treatments.

Purpose of the Study:

  • To investigate the regulation of circular RNAs (circRNAs) by heroin in the rat orbitofrontal cortex (OFC).
  • To identify specific circRNAs affected by heroin self-administration.
  • To explore the potential mechanisms, including microRNA sponging, by which heroin-induced circRNAs may contribute to OUD.

Main Methods:

  • Microarray analysis was used to identify differentially expressed circRNAs in the OFC of male rats following heroin self-administration.
  • Expression levels of identified circRNAs were validated in female rats and in rats self-administering sucrose to assess specificity.
  • Bioinformatic analysis was performed to predict microRNA interactions and downstream targets of regulated circRNAs.

Main Results:

  • Heroin self-administration significantly regulated 76 circRNAs in the rat OFC.
  • Specific heroin-responsive circRNAs identified include circGrin2b, circUbe2cp, circAnks1a, circAdcy5, and circSlc24A2.
  • Linear mRNA levels for most affected circRNAs remained unchanged, except for Grin2b and Adcy5, suggesting regulation at the circRNA level.

Conclusions:

  • Heroin exposure leads to significant changes in circRNA expression within the OFC.
  • These heroin-regulated circRNAs, potentially through microRNA sponging, may play a role in the neurobiological adaptations associated with chronic heroin use.
  • Further research into circRNA regulation could offer novel therapeutic targets for OUD.