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Human alpha-fetoprotein: immunosuppressive activity and microheterogeneity

E P Lester, J B Miller, S Yachnin

    Immunological Communications
    |January 1, 1978
    PubMed
    Summary

    Human alpha-fetoprotein (HAFP) shows varying immunosuppressive effects, particularly on T cells. Its potency correlates with specific HAFP molecular forms, suggesting a link between microheterogeneity and immune function.

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    Area of Science:

    • Immunology
    • Biochemistry
    • Oncology

    Background:

    • Alpha-fetoprotein (AFP) is a protein primarily produced during fetal development.
    • Elevated AFP levels are observed in certain cancers, such as hepatoma and gastric carcinoma.
    • The immunosuppressive properties of AFP are not fully understood.

    Purpose of the Study:

    • To investigate the immunosuppressive potencies of purified human alpha-fetoprotein (HAFP) from various sources.
    • To explore the relationship between HAFP microheterogeneity and its immunosuppressive activity.
    • To elucidate the mechanism of HAFP's interaction with immune cells.

    Main Methods:

    • Purification of HAFP from hepatoma, gastric carcinoma, embryonal cell tumor, and fetal liver samples.
    • In vitro assessment of HAFP immunosuppressive potencies.

    Related Experiment Videos

  • Analysis of HAFP microheterogeneity using crossed immunoelectrophoresis and isoelectric focusing.
  • Investigation of HAFP-cell surface and HAFP-mitogen interactions.

    • Main Results:

    • Purified HAFP exhibited immunosuppressive potencies varying over three orders of magnitude.
    • HAFP demonstrated a reversible association with cell surfaces, predominantly affecting T cells.
    • No evidence of complex formation between HAFP and mitogens was found.
    • A correlation was established between the immunosuppressive potency of HAFP and the proportion of specific HAFP species.

    Conclusions:

    • HAFP possesses significant immunosuppressive capabilities, with potency influenced by its molecular composition.
    • The findings suggest HAFP plays a role in immune modulation, potentially through T cell interactions.
    • Understanding HAFP microheterogeneity is crucial for comprehending its biological functions in health and disease.