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Relationship between IL-2 and human T cell colony formation.

M D Mossalayi, J C Lecron, J Tanzer

    Clinical and Experimental Immunology
    |December 1, 1986
    PubMed
    Summary
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    The standard IL-2 microassay may not accurately measure colony promoting activity (CPA) for T cell growth. CPA and IL-2 appear to be distinct factors, with CPA crucial for secondary T cell colony formation.

    Area of Science:

    • Immunology
    • Cell Biology
    • Biotechnology

    Background:

    • Interleukin-2 (IL-2) is a cytokine critical for T cell proliferation.
    • Colony Promoting Activity (CPA) is essential for T cell colony formation in semi-solid cultures.
    • The reliability of standard IL-2 assays for measuring CPA is not well-established.

    Purpose of the Study:

    • To evaluate the standard IL-2 microassay as a measure of CPA for PHA-induced T cell colony growth.
    • To investigate the relationship between IL-2 levels and CPA in T cell cultures.
    • To assess the utility of primary T cell colonies as targets for CPA measurement.

    Main Methods:

    • Utilized a standard IL-2 microassay measuring 3H-thymidine uptake by IL-2-dependent T cell lines.
    • Assessed colony promoting activity (CPA) in PHA-induced T cell colony growth using primary and secondary colonies from peripheral blood mononuclear cells (PBL).

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  • Compared IL-2 measurements with CPA levels determined through colony growth assays.

    • Main Results:

    • PHA-stimulated PBL formed primary colonies without exogenous CPA, but CPA enhanced growth.
    • Primary colonies required exogenous CPA for PHA-induced secondary colony formation.
    • A strong correlation (r = 0.98) was observed between PBL and primary colony-forming capacity with added CPA.
    • CPA and IL-2 levels did not correlate when measured in secondary colony growth and IL-2 microassays, respectively.
    • Primary colonies demonstrated potential as target cells for CPA measurement in conditioned media.

    Conclusions:

    • The standard IL-2 microassay may not be a reliable indicator of CPA.
    • IL-2 and CPA likely represent distinct biological factors involved in T cell growth.
    • Primary T cell colonies are suitable targets for assessing CPA levels.