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Related Experiment Videos

Interleukin 1 activity in normal human urine.

E S Kimball, S F Pickeral, J J Oppenheim

    Journal of Immunology (Baltimore, Md. : 1950)
    |July 1, 1984
    PubMed
    Summary
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    Normal urine contains interleukin 1 (IL 1)-like activity, but most samples also have an inhibitor of IL 1-promoted thymocyte proliferation. This inhibitor

    Area of Science:

    • Immunology
    • Biochemistry

    Background:

    • Interleukin 1 (IL 1) is a key cytokine involved in immune responses.
    • Urine as a source of biologically active molecules is under investigation.

    Purpose of the Study:

    • To investigate the presence and characteristics of IL 1-like activity and its inhibitors in normal human urine.
    • To characterize the molecular weight and biological activity of these components.

    Main Methods:

    • Urine concentrates were tested for IL 1-like activity on human dermal fibroblasts and mouse thymocytes.
    • Inhibitory activity against IL 1-promoted proliferation was assessed.
    • Gel filtration was used to fractionate urine concentrates and determine molecular weights of active components.

    Main Results:

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    • Normal urine contains IL 1-like activity affecting fibroblasts and thymocytes.
    • A specific inhibitor of IL 1-promoted thymocyte proliferation was found in 75% of samples.
    • This inhibitor did not affect IL 2-promoted proliferation or IL 1-promoted fibroblast proliferation.
    • Gel filtration revealed IL 1-like activities with approximate molecular weights of 75,000, 15,000, 4,000, and 2,000. The 2,000 molecular weight fraction also showed fibroblast proliferative activity.

    Conclusions:

    • Human urine contains both IL 1-like proliferative activities and specific inhibitors of IL 1-mediated thymocyte responses.
    • The identified inhibitor is specific for IL 1-induced thymocyte proliferation.
    • Further characterization of these urinary factors may provide insights into immune regulation and diagnostics.