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Related Experiment Videos

Functional consequence of variation in melanoma antigen expression.

L M Zehngebot, M A Alexander, D Guerry

    Cancer Immunology, Immunotherapy : CII
    |January 1, 1983
    PubMed
    Summary

    Melanoma cells show quantitative changes in antigen expression during culture. Higher levels of the HLA-DR antigen on melanoma cells correlate with increased allogeneic T cell proliferation, highlighting its role in immune response.

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    Area of Science:

    • Immunology
    • Oncology
    • Cell Biology

    Background:

    • Melanoma cells express melanoma-associated antigens and HLA-DR.
    • Antigen expression may change with serial passage in culture.

    Purpose of the Study:

    • To investigate quantitative changes in melanoma-associated antigen and HLA-DR expression during serial melanoma cell culture.
    • To determine the functional impact of HLA-DR expression levels on T cell proliferation.

    Main Methods:

    • Serial passage of three melanoma cell lines.
    • Monoclonal antibody binding assays to quantify antigen expression.
    • Fluorescence-activated cell sorting to create DR-enriched and DR-depleted cell populations.
    • 3H-TdR uptake assay to measure allogeneic T cell proliferation.

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    Main Results:

    • Melanoma-associated antigen and HLA-DR were qualitatively conserved but showed significant quantitative variations across passages.
    • DR-enriched melanoma cell populations induced higher allogeneic T cell proliferation compared to DR-depleted populations.
    • T cell proliferation directly correlated with the level of HLA-DR antigen expression on melanoma cells.

    Conclusions:

    • Quantitative assessment of antigen expression is crucial in melanoma cell line experiments, especially when investigating antigen function.
    • The HLA-DR antigen on melanoma cells actively participates in stimulating allogeneic lymphocytes.
    • Understanding antigen dynamics in melanoma cell culture is vital for immunological studies.