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Morphine state-dependent learning sensitization and interaction with nitric oxide.

Mohammad-Reza Zarrindast1, Elham Askari, Azita Khalilzadeh

  • 1Department of Pharmacology and Iranian National Center for Addiction Studies, School of Medicine, Tehran University of Medical Sciences, PO Box 13145-784 Tehran, Iran. zarinmr@ams.ac.ir

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Nitric oxide (NO) plays a role in morphine sensitization. Supplementing with L-arginine enhanced morphine

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Morphine tolerance and sensitization are complex phenomena.
  • Nitric oxide (NO) is implicated in various neurological processes.

Purpose of the Study:

  • To investigate the role of nitric oxide (NO) in morphine-induced sensitization.
  • To examine the effects of L-arginine (NO precursor) and L-NAME (NO synthase inhibitor) on morphine sensitization.

Main Methods:

  • Morphine sensitization was induced in mice through repeated injections.
  • Memory retrieval was assessed using behavioral tests.
  • L-arginine and L-NAME were administered before training and during sensitization acquisition.
  • The impact on morphine state dependency was evaluated.

Main Results:

  • Pre-training L-arginine or L-NAME did not affect morphine state dependency.
  • During sensitization, L-arginine administration enhanced morphine state dependency.
  • Conversely, L-NAME administration decreased morphine state dependency.
  • Morphine administration impaired memory retrieval, which was restored by subsequent morphine doses.

Conclusions:

  • Nitric oxide (NO) is involved in the expression of morphine-induced sensitization.
  • Modulating NO pathways can alter the development of morphine tolerance and dependence.