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Human thymus/leukemia-associated antigen in normal and leukemic cells

B E Chechik, K W Pyke, E W Gelfand

    International Journal of Cancer
    |November 15, 1976
    PubMed
    Summary

    A novel human thymus/leukemia-associated antigen (HThy-L) was identified. This antigen is linked to T-cell differentiation and serves as a marker for specific acute leukemia types.

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    Area of Science:

    • Immunology
    • Oncology
    • Cell Biology

    Background:

    • The human thymus is central to T-cell development.
    • Leukemia involves uncontrolled proliferation of blood cells, often originating from lymphoid or myeloid lineages.
    • Specific cell surface antigens can serve as markers for cell differentiation and disease states.

    Purpose of the Study:

    • To identify and characterize a novel antigen associated with human thymus and leukemia.
    • To investigate the presence and distribution of this antigen in various human cell types and leukemia subtypes.

    Main Methods:

    • Saline extraction of antigens from human thymus and leukemia cell samples.
    • Immunodiffusion assays using rabbit antisera raised against human thymus extracts.
    • Quantification of antigen levels in different cell types and patient samples.

    Main Results:

    • A saline-extractable antigen, HThy-L, was detected in human thymus extracts.
    • HThy-L was present in normal thymocytes, E-rosetting T-cell lines, and E-rosetting acute lymphoblastic leukemia (ALL) cells.
    • Significantly lower levels of HThy-L were found in acute myeloblastic leukemia and E-rosette-negative ALL cells.
    • Trace amounts of HThy-L were detected in normal spleen, tonsil, peripheral blood, bone marrow, and PHA-induced lymphoblasts.

    Conclusions:

    • HThy-L is associated with intrathymic differentiation of human T cells.
    • HThy-L serves as a potential marker for leukemic cells in specific forms of acute leukemia, particularly E-rosetting ALL.

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