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Related Experiment Videos

Efficient isolation of mutant antigen presenting cell lines by functional selection using T cell clones

S Koarada1, E Kubota, M Tokushima

  • 1Department of Immunology, Saga Medical School, Japan.

Journal of Immunological Methods
|June 9, 1995
PubMed
Summary

A new method efficiently isolates mutant antigen-presenting cell (APC) lines by using autoreactive T cell clones to select for variants. This technique aids in studying antigen presentation and T cell stimulation pathways.

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Area of Science:

  • Immunology
  • Cell Biology
  • Genetics

Background:

  • Antigen-presenting cells (APCs) are crucial for initiating adaptive immune responses.
  • Understanding APC function requires tools to isolate and study mutant cell lines.
  • Existing methods for isolating APC mutants are inefficient.

Purpose of the Study:

  • To develop an efficient method for isolating mutant antigen-presenting cell (APC) lines.
  • To identify APC mutants with altered antigen presentation capabilities.
  • To facilitate the study of major histocompatibility complex (MHC) class II structure and T cell stimulation.

Main Methods:

  • Utilized a selection strategy involving autoreactive T cell clones and APC mixtures.
  • Applied ethyl methane sulfonate (EMS) treatment to induce mutations in APC lines.

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  • Cultured and selected mutant APC lines based on their ability to stimulate or escape T cell recognition.

    • Main Results:

    • Achieved near 100% enrichment of variant APC lines (TA beta d) through T cell-mediated selection.
    • Isolated mutant APC lines that lost the ability to stimulate T cell clones.
    • Identified mutant APCs with altered MHC class II sequences, reduced adhesion molecule expression, or impaired peptide loading.

    Conclusions:

    • The described method efficiently isolates mutant APC lines, enabling the study of antigen processing and presentation.
    • Mutant APCs identified exhibit diverse defects, including changes in MHC class II, adhesion, and peptide loading.
    • This approach provides valuable tools for dissecting T cell-APC interactions and MHC class II function.