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Related Experiment Videos

Cloned human cytotoxic T lymphocytes develop anomalous killer cell function.

G F Burns, T Triglia, J A Werkmeister

    Clinical and Experimental Immunology
    |December 1, 1986
    PubMed
    Summary
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    The cytochemistry of human lymphoreticular subpopulations.

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    Most cytotoxic T lymphocytes (CTL) can also kill melanoma cells, suggesting their potential for passive immunotherapy. These findings highlight CTL adaptability in cancer treatment strategies.

    Area of Science:

    • Immunology
    • Cancer Biology
    • Cellular Immunology

    Background:

    • Epstein-Barr virus (EBV) infects B lymphoblasts, a relevant model for studying cellular immune responses.
    • Cytotoxic T lymphocytes (CTL) play a crucial role in recognizing and eliminating virally infected cells and tumor cells.

    Purpose of the Study:

    • To investigate the functional plasticity of cytotoxic T lymphocytes (CTL) generated against EBV-infected B lymphoblasts.
    • To determine if CTL can acquire the ability to kill melanoma cells and if this impacts their original specificity.

    Main Methods:

    • Mixed lymphocyte cultures were established using peripheral blood mononuclear cells and EBV-infected B lymphoblasts (autologous and allogeneic).
    • Resulting effector cells were cloned and subcloned to assess cytotoxic activity against B lymphoblasts, K562, and melanoma targets.

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  • Monoclonal antibodies against LFA-1, T3, and T8 were used to characterize the effector cell functions.

    • Main Results:

    • In allogeneic cultures, a significant proportion of CTL subclones lost specific CTL function but gained the ability to kill melanoma cells.
    • In autologous cultures, a substantial percentage of subclones exhibited melanoma cell-killing activity, with some retaining dual specificity and others exclusively targeting melanoma.
    • Melanoma cell killing (anomalous killer; AK function) and B lymphoblast killing (CTL function) were differentially blocked by specific antibodies, indicating distinct mechanisms.

    Conclusions:

    • The majority of CTL possess the inherent capacity to function as anomalous killer (AK) cells, targeting melanoma cells.
    • This plasticity suggests that CTL could be a valuable component for developing passive immunotherapy strategies against cancer.