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Purification and initial characterization of rat interleukin 2

G Di Sabato

    Proceedings of the National Academy of Sciences of the United States of America
    |May 1, 1982
    PubMed
    Summary

    Researchers purified interleukin 2 (IL-2) from rat spleen, achieving significant enrichment of its thymocyte stimulatory and T cell growth factor activities. This purification process provides insights into IL-2

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    Area of Science:

    • Immunology
    • Biochemistry
    • Molecular Biology

    Background:

    • Interleukin 2 (IL-2) is a critical cytokine for T cell proliferation and immune responses.
    • Understanding the purification and properties of IL-2 is essential for immunological research.

    Purpose of the Study:

    • To purify and characterize the thymocyte stimulatory factor (TSF) and T cell growth factor (TCGF) activities of rat spleen interleukin 2 (IL-2).
    • To investigate the co-chromatographic behavior and physicochemical properties of IL-2's distinct activities.

    Main Methods:

    • Sequential purification using dialysis, Sephadex G-100, affinity chromatography (reactive red 120-agarose, p-hydroxymercuribenzoate-agarose, phenyl-Sepharose, poly(L-lysine)-agarose), and isoelectric focusing.
    • Characterization of IL-2 activity through dose-response assays.
    • Analysis of purified IL-2 by SDS-PAGE under denaturing and reducing conditions after radioiodination.

    Main Results:

    • IL-2 was purified approximately 8,000-fold for TSF activity and 6,000-fold for TCGF activity.
    • TSF and TCGF activities co-chromatographed but sometimes showed dissociation, suggesting distinct components or forms.
    • Both activities exhibited an isoelectric point (pI) between pH 5.50 and 6.30.
    • Radioiodinated IL-2 showed a major band under 20,000 Da and smaller bands at 20,000, 60,000, and 90,000 Da on SDS-PAGE.
    • TSF activity did not bind to lectin-gels, indicating a lack of specific glycosylation.

    Conclusions:

    • A multi-step purification protocol effectively enriched IL-2's TSF and TCGF activities from rat spleen.
    • IL-2 possesses distinct but often co-purifying TSF and TCGF activities with a specific pI range.
    • The molecular weight heterogeneity and lack of lectin binding provide further characterization of IL-2.

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