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Related Experiment Videos

Does prolonged oral treatment with sustained-release morphine tablets influence immune function?

S Palm1, S Lehzen, C Mignat

  • 1Clinic of Anesthesiology and Operative Intensive Care, University of Kiel, Germany.

Anesthesia and Analgesia
|January 16, 1998
PubMed
Summary
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Morphine treatment for chronic pain does not affect cellular immunity but further suppresses immunoglobulin production in patients already experiencing reduced levels. This impacts humoral immune function, with clinical significance yet to be determined.

Area of Science:

  • Immunology
  • Pharmacology
  • Pain Management

Background:

  • Opioids like morphine are essential for managing acute and chronic pain.
  • The potential immunosuppressive effects of morphine require further investigation in pain patient populations.

Purpose of the Study:

  • To evaluate the impact of oral sustained-release morphine on the immune system in patients with chronic pain syndromes.
  • To compare immunological variables between patients receiving morphine and healthy controls.

Main Methods:

  • Assessed total lymphocyte counts and lymphocyte subpopulations (including CD4/CD8 ratios) in 10 chronic pain patients before and during 12 weeks of morphine treatment.
  • Measured peripheral mononuclear cell (PMC) proliferation and production of interleukin-2 (IL-2) and immunoglobulins (Ig).

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  • Compared results against baseline and healthy control subjects.

    • Main Results:

    • No significant changes were observed in total lymphocyte counts, lymphocyte subpopulations, or PMC proliferation.
    • Interleukin-2 production increased after 4 weeks of morphine treatment.
    • Immunoglobulin production was reduced in pain patients prior to treatment and decreased further with morphine, although circulating Ig levels remained normal.

    Conclusions:

    • Oral sustained-release morphine does not suppress cellular immune function in chronic pain patients.
    • Morphine further suppresses immunoglobulin production in patients with chronic pain who already exhibit reduced levels.
    • The clinical relevance of morphine's effect on humoral immunity warrants further investigation.