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IA mutant functional antigen-presenting cell lines.

L H Glimcher, T Hamano, R Asofsky

    Journal of Immunology (Baltimore, Md. : 1950)
    |May 1, 1983
    PubMed
    Summary
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    Researchers developed a method to select mutant antigen-presenting cells (APCs) with altered Ia antigen properties. This technique helps study the relationship between Ia molecule structure and T cell recognition, advancing immune response gene research.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • Antigen-presenting cells (APCs) are crucial for initiating immune responses.
    • Ia antigens, encoded by immune response genes, play a key role in APC function and T cell recognition.
    • Understanding the structure-function relationship of Ia molecules is vital for deciphering immune regulation.

    Purpose of the Study:

    • To establish a protocol for generating and selecting mutant APCs with specific alterations in Ia antigenic determinants.
    • To investigate the functional consequences of these alterations on antigen presentation.
    • To explore the relationship between Ia molecule structure and T cell receptor recognition.

    Main Methods:

    • Generation of hybridoma APC line (TA3) by fusing B cells with a B lymphoma cell line.

    Related Experiment Videos

  • Employing negative and positive immunoselection using monoclonal antibodies against I-Ak and I-Ek.
  • Utilizing electronic cell sorting for mutant selection.
  • Functional assays involving antigen presentation to specific T cell hybridomas.

    • Main Results:

    • Two types of mutants were obtained: one with partial loss of I-Ak determinants (A8) and another with complete loss of I-Ak but retention of I-E.
    • The A8 mutant showed a specific defect in presenting hen egg lysozyme (HEL) to an I-Ak-restricted T cell hybridoma, while retaining capacity for poly(Glu60Ala30Tyr10) (GAT) presentation.
    • This selective loss of antigen presentation correlated with the loss of specific I-Ak-encoded restriction elements.

    Conclusions:

    • Ia antigens are direct products of immune response gene loci.
    • The study provides a powerful tool for dissecting the structure-function relationships of Ia molecules.
    • These findings facilitate a deeper examination of how Ia molecule structure dictates co-recognition by T cells.