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Lymphotoxins: selective cytotoxic effects

B A Lisafeld, J Minowada, E Klein

    International Archives of Allergy and Applied Immunology
    |January 1, 1980
    PubMed
    Summary
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    Lymphotoxin preparations exhibit selective cytotoxicity against various cell types, revealing significant heterogeneity in both cell responses and lymphotoxin activity. This variability impacts host antitumor immunity and tumor evasion mechanisms.

    Area of Science:

    • Immunology
    • Cell Biology
    • Molecular Biology

    Background:

    • Lymphotoxin (LT) is a cytokine involved in immune responses.
    • Understanding LT activity is crucial for cancer immunology and immunotherapy.

    Purpose of the Study:

    • To investigate the cytotoxic effects of lymphotoxin preparations on diverse cell cultures.
    • To analyze the heterogeneity of cell responses to lymphotoxin and its implications for tumor immunity.

    Main Methods:

    • Testing lymphotoxin activity from human lymphocytes (T and B cells) and lymphoid cell lines.
    • Assessing cytotoxicity against numerous primary and established human and animal cell lines.
    • Quantifying the range of susceptibility among different cell cultures and clonal derivatives.

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    Main Results:

    • Lymphotoxin preparations demonstrated highly selective cytotoxic effects.
    • Significant heterogeneity was observed in cell culture responses to lymphotoxin.
    • A 200-fold range in susceptibility was noted between the most resistant and susceptible cell cultures.
    • Heterogeneity also existed among different lymphotoxin preparations and within clonal derivatives of the same cell line.

    Conclusions:

    • Cellular responses to lymphotoxin are heterogeneous, impacting the effectiveness of immune responses.
    • Lymphotoxin heterogeneity may play a role in tumor evasion of host antitumor immunity.
    • These findings provide insights into the complex interactions between lymphotoxin, target cells, and immune evasion strategies.