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Related Experiment Videos

Morphine pellet-induced immunomodulation in mice: temporal relationships.

H U Bryant1, E W Bernton, J W Holaday

  • 1Department of Medical Neuroscience, Walter Reed Army Institute of Research, Washington, D.C.

The Journal of Pharmacology and Experimental Therapeutics
|June 1, 1988
PubMed
Summary

Morphine significantly impacts immune function, reducing T and B lymphocyte proliferation and causing thymus and spleen atrophy in mice. These effects, along with tolerance to pain relief, were observed within 72 hours post-administration.

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Area of Science:

  • Immunology
  • Pharmacology
  • Toxicology

Background:

  • Morphine, a potent analgesic, is known to modulate immune responses.
  • Understanding the temporal effects of morphine on the immune system is crucial for clinical applications.

Purpose of the Study:

  • To investigate the time-dependent effects of morphine on murine immune cell proliferation and organ size.
  • To assess the development of tolerance to morphine's analgesic effects concurrently with immunomodulation.

Main Methods:

  • Male C3H/HeN mice received 75-mg morphine or placebo pellets.
  • Spleen and thymus size and cellularity were measured at various time points.
  • In vitro lymphocyte proliferation assays (T cells with Concanavalin A, B cells with lipopolysaccharide) were performed.

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  • Hypothermia and analgesic tolerance were assessed.

    • Main Results:

    • Morphine reduced T lymphocyte proliferation at 48 and 72 hours post-implantation.
    • B lymphocyte proliferation was reduced at 24, 48, and 72 hours.
    • Significant spleen and thymus atrophy occurred, peaking at 48-72 hours.
    • Hypothermia and analgesic tolerance were observed at all monitored time points.

    Conclusions:

    • Morphine exerts significant, time-dependent suppressive effects on adaptive immune responses in mice.
    • Immune organ atrophy and analgesic tolerance correlate with suppressed lymphocyte function.
    • These findings highlight the complex interplay between morphine, analgesia, and the immune system.