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Related Experiment Videos

Antigen processing mutant T2 cells present viral antigen restricted through H-2Kb

X Zhou1, R Glas, T Liu

  • 1Department of Immunology, Karolinska Institute, Stockholm, Sweden.

European Journal of Immunology
|August 1, 1993
PubMed
Summary

Cytotoxic T lymphocytes (CTL) can kill virus-infected T2 cells, despite their defect in antigen presentation. This suggests an alternative pathway for MHC class I antigen presentation may exist in these cells.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Virology

Background:

  • Cytotoxic T lymphocytes (CTL) are crucial for adaptive immunity, recognizing foreign antigens presented by MHC class I molecules.
  • T2 cells, lacking transporters associated with antigen presentation (TAP1/TAP2), exhibit impaired endogenous antigen presentation to CTL.
  • The precise mechanisms of antigen presentation in TAP-deficient cells remain incompletely understood.

Purpose of the Study:

  • To investigate the antigen presentation capacity of T2 cells following viral infection.
  • To determine if T2 cells can be recognized and killed by CTL despite their known presentation defect.
  • To explore potential alternative pathways for MHC class I-mediated antigen presentation.

Main Methods:

  • Infection of T2 cells with Sendai virus.

Related Experiment Videos

  • Assessment of T2 cell killing by H-2Kb restricted CD8+ T cells.
  • Treatment with brefeldin A (BFA) to differentiate antigen presentation pathways.

    • Main Results:

    • T2 cells infected with Sendai virus were effectively killed by H-2Kb restricted CD8+ T cells.
    • This recognition and killing of infected T2 cells was insensitive to brefeldin A (BFA).
    • This contrasts with the classical pathway of MHC class I antigen presentation, which is BFA-sensitive.

    Conclusions:

    • T2 cells can present viral antigens to CTL, leading to cell-mediated killing.
    • The BFA-insensitive nature of this presentation suggests an alternative antigen processing and presentation pathway.
    • These findings challenge the classical model and highlight novel mechanisms in MHC class I antigen presentation.