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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
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Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
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Morphine-induced hyperalgesia impacts small extracellular vesicle miRNA composition and function.

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Morphine treatment alters microRNAs in small extracellular vesicles (sEVs), potentially offering a new non-opioid pain therapy. These sEVs may help resolve inflammatory hypersensitivity.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Opioid analgesics like morphine are common pain treatments.
  • Prolonged opioid use can paradoxically increase pain sensitivity (opioid-induced hyperalgesia).
  • The molecular mechanisms driving opioid-induced hyperalgesia remain incompletely understood.

Purpose of the Study:

  • To investigate molecular changes in serum-derived small extracellular vesicles (sEVs) following morphine administration.
  • To identify specific microRNAs (miRNAs) within sEVs that are dysregulated by morphine.
  • To assess the therapeutic potential of morphine-altered sEVs in pain management.

Main Methods:

  • Mice received morphine to induce hyperalgesia.
  • Serum sEVs were isolated and their miRNA composition analyzed.
  • Bioinformatic analysis predicted miRNA targets involved in pain pathways.
  • Creb mRNA regulation by specific miRNAs was experimentally confirmed.
  • Naïve mice received sEVs to assess behavioral effects.

Main Results:

  • Morphine treatment significantly altered the expression of 18 miRNAs in serum sEVs.
  • Several dysregulated miRNAs were predicted to target CREB (cyclic AMP response element binding protein).
  • miR-155 and miR-10a were confirmed to bind and repress Creb mRNA.
  • sEVs from morphine-treated mice accelerated the resolution of inflammatory hypersensitivity in naïve recipients.
  • No significant impact on basal pain thresholds, place preference, or locomotor sensitization was observed.

Conclusions:

  • Morphine alters serum sEV miRNA profiles, including those targeting CREB.
  • Serum sEVs from morphine-treated mice possess the capacity to mitigate inflammatory pain hypersensitivity.
  • sEVs represent a promising non-opioid therapeutic strategy for pain management.