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Opioid-induced modification of granulocyte function.

M Marcoli1, G Ricevuti, A Mazzone

  • 1Department of Internal Medicine and Therapeutics, University of Pavia, Italy.

International Journal of Immunopharmacology
|January 1, 1988
PubMed
Summary
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Opioid agonists inhibit human granulocyte migration and aggregation. Naloxone, an opioid antagonist, blocked these effects, suggesting opioid receptor involvement in immune cell responses.

Area of Science:

  • Immunology
  • Neuroscience
  • Pharmacology

Background:

  • Opioid receptors are primarily known for their role in pain modulation.
  • Emerging evidence suggests opioids can influence immune cell function.
  • The specific effects of different opioid receptor agonists on granulocyte migration and aggregation remain incompletely understood.

Purpose of the Study:

  • To investigate the effects of mu and kappa opioid receptor agonists on human granulocyte chemotaxis and aggregation.
  • To determine the role of opioid receptors in modulating granulocyte migration using naloxone, an opioid antagonist.
  • To differentiate the effects of opioid agonists and opioid peptides on granulocyte functions.

Main Methods:

  • Human granulocyte isolation and preparation.

Related Experiment Videos

  • Chemotaxis assays using casein as a chemoattractant.
  • Aggregation assays to measure granulocyte response.
  • Administration of mu and kappa opioid receptor agonists and naloxone.

    • Main Results:

    • Both mu and kappa opioid receptor agonists inhibited human granulocyte chemotaxis towards casein.
    • These opioid agonists also demonstrated chemokinetic activity, increasing granulocyte migration independently.
    • Naloxone effectively prevented both opioid-related and opioid-unrelated increases in granulocyte migration.
    • Morphine inhibited granulocyte aggregation in a naloxone-sensitive manner, while opioid peptides had no effect.

    Conclusions:

    • Opioid receptor activation by agonists like morphine can significantly alter human granulocyte migration and aggregation.
    • While naloxone blocks these opioid-induced effects, a definitive conclusion on the specific role of opioid receptors in regulating granulocyte migration cannot be drawn solely from these findings.
    • Morphine's inhibition of granulocyte aggregation appears to be mediated through opioid receptor activation.