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Related Experiment Videos

Anti-Tm is anti-N polypeptide

P D Issitt, S L Wilkinson

    Transfusion
    |September 1, 1981
    PubMed
    Summary

    Anti-Tm antibodies target a specific antigen within the MN blood group system. Research indicates these antibodies are directed against the polypeptide backbone of N sialoglycoprotein (SGP) in red blood cells.

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    Area of Science:

    • Immunology
    • Blood Group Serology
    • Biochemistry

    Background:

    • The MN blood group system is a significant area of human blood group antigen research.
    • Previous studies identified an antigen defined by anti-Tm within the MN system.
    • The precise specificity of anti-Tm and its relationship to other MN antigens remained unclear.

    Purpose of the Study:

    • To elucidate the exact specificity of the anti-Tm antibody.
    • To determine the molecular target of anti-Tm within the MN blood group system.
    • To investigate the interaction between anti-Tm, red blood cell antigens, and sialoglycoproteins.

    Main Methods:

    • Serological testing of Caucasian and Negro blood samples with anti-Tm.
    • Adsorption of anti-Tm serum to remove anti-T specificity.
    • Testing adsorbed anti-Tm against neuraminidase-treated red blood cells.
    • Inhibition assays using sialoglycoprotein (SGP) preparations from treated and untreated red blood cells.

    Main Results:

    • A significant proportion of tested blood samples were positive for the Tm antigen.
    • Adsorption and testing revealed that anti-Tm possesses anti-N specificity against neuraminidase-treated red blood cells.
    • Anti-Tm inhibition assays demonstrated specificity towards SGP fractions from neuraminidase-treated N+ red blood cells.

    Conclusions:

    • The anti-Tm antibody is specifically directed against a component of the N sialoglycoprotein (SGP).
    • This component appears to be part of the polypeptide backbone of the N SGP.
    • The findings clarify the specificity of anti-Tm within the MN blood group system.

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