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Delay of morphine tolerance by palmitoylethanolamide.

Lorenzo Di Cesare Mannelli1, Francesca Corti1, Laura Micheli1

  • 1Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino-Neurofarba-Sezione di Farmacologia e Tossicologia, Università di Firenze, Viale Pieraccini 6, 50139 Florence, Italy.

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N-palmitoylethanolamine (PEA) can extend morphine

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Management

Background:

  • Morphine is effective for pain but its use is limited by tolerance.
  • Glial cell activation and pro-inflammatory mediators are implicated in morphine tolerance.
  • N-palmitoylethanolamine (PEA) is an endogenous compound with anti-nociceptive properties that can reduce glial activation.

Purpose of the Study:

  • To investigate the potential of PEA to attenuate morphine tolerance.
  • To explore the effects of PEA on glial activation and pro-inflammatory mediators in the context of morphine treatment.

Main Methods:

  • Rats were treated with morphine (10 mg/kg) and either PEA (30 mg/kg) or vehicle.
  • Morphine antinociceptive efficacy was assessed over time.
  • Spinal cord tissue was analyzed for glial cell numbers (microglia, astrocytes) and TNF-α levels and immunoreactivity.

Main Results:

  • PEA treatment doubled the duration of morphine's antinociceptive effect.
  • PEA prevented the morphine-induced increase in microglia and astrocyte numbers in the dorsal horn.
  • While PEA did not alter overall spinal TNF-α levels, it increased TNF-α immunoreactivity within astrocytes, suggesting reduced release.

Conclusions:

  • PEA effectively attenuates the development of morphine tolerance.
  • PEA's mechanism involves reducing glial activation.
  • PEA may be a valuable adjunct to opioid-based therapies for chronic pain management.