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Selective defects in T cell function in ataxia-telangiectasia.

W R Levis, A M Dattner, J S Shaw

    Clinical and Experimental Immunology
    |July 1, 1979
    PubMed
    Summary

    Patients with ataxia-telangiectasia (AT) show normal mixed leucocyte culture responses but defective cell-mediated lympholysis (CML). This suggests AT's T cell defect impacts antigen recognition and CML generation, sparing proliferative responses.

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    Area of Science:

    • Immunology
    • Genetics
    • Cell Biology

    Background:

    • Ataxia-telangiectasia (AT) is a rare genetic disorder characterized by progressive neurodegeneration, immunodeficiency, and increased cancer risk.
    • The underlying molecular defect in AT involves mutations in the ATM gene, crucial for DNA damage response.
    • Immunodeficiency in AT often manifests as defects in T cell and B cell function, but the precise nature of these defects is not fully elucidated.

    Purpose of the Study:

    • To investigate specific T cell functions in patients with ataxia-telangiectasia.
    • To differentiate between proliferative and cytotoxic T cell responses in AT.
    • To explore the relationship between DNA repair defects and T cell dysfunction in AT.

    Main Methods:

    • Studied three patients diagnosed with ataxia-telangiectasia.
    • Assessed mixed leucocyte culture (MLC) stimulating and responding abilities.
    • Evaluated cell-mediated lympholysis (CML) capacity.
    • Measured proliferative responses to common microbial antigens (tetanus toxoid, Candida albicans, PPD, diphtheria toxoid, influenza).

    Main Results:

    • Two out of three AT patients exhibited normal MLC stimulating and responding abilities.
    • All three AT patients and one parent demonstrated defective cell-mediated lympholysis (CML).
    • Despite defective CML, a potent proliferative response to allogeneic leucocytes was observed in these patients.
    • No significant proliferative responses to common microbial antigens were detected in the AT patients.

    Conclusions:

    • The T cell defect in ataxia-telangiectasia preferentially affects functions related to antigen recognition and allogeneic CML generation.
    • Specific T cell functions, such as allogeneic proliferative responses, may be spared in AT.
    • The selective impairment of lymphocyte functions in AT supports the role of DNA-modulating enzymes in T cell function.

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