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Physiological mechanisms contributing to increased interleukin-1 secretion.

J G Cannon, W J Evans, V A Hughes

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |November 1, 1986
    PubMed
    Summary

    Exercise increases Interleukin-1 (IL-1) plasma activity, potentially mediated by stress hormones like epinephrine and hydrocortisone, not cellular damage. This study explores IL-1

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    Three distinct promoters direct transcription of different 5' untranslated regions of the human interleukin 1 type I receptor: a possible mechanism for control of translation.

    Cytokine·1996

    Area of Science:

    • Immunology
    • Exercise Physiology
    • Cell Biology

    Background:

    • Interleukin-1 (IL-1) is a key polypeptide in host defense.
    • Exercise induces physiological stresses that may affect immune responses.
    • Understanding IL-1 regulation post-exercise is crucial for host defense insights.

    Purpose of the Study:

    • Characterize Interleukin-1 (IL-1) activity in human plasma after exercise.
    • Identify physiological triggers for IL-1 secretion by monocytes.
    • Investigate the role of stress hormones in exercise-induced IL-1 release.

    Main Methods:

    • Measured IL-1 activity via lymphocyte proliferation assays.
    • Assessed plasma IL-1 post-exercise using a cycle ergometer.
    • Tested monocyte IL-1 secretion in vitro with red blood cell lysates and stress hormones (epinephrine, hydrocortisone).

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    Main Results:

    • IL-1 activity detected in plasma hours after exercise.
    • Exercise-induced IL-1 increase did not correlate with creatine kinase levels.
    • Epinephrine and low-dose hydrocortisone significantly augmented monocyte IL-1 secretion in vitro.

    Conclusions:

    • Exercise stimulates IL-1 activity in human plasma.
    • IL-1 secretion is likely mediated by stress hormones, not cellular debris scavenging.
    • Epinephrine and hydrocortisone are potential physiological initiators of IL-1 release post-exercise.