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Related Experiment Videos

Major histocompatibility complex class I-restricted alloreactive CD4+ T cells.

Louise H Boyle1, Jane C Goodall, J S Hill Gaston

  • 1Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK.

Immunology
|April 21, 2004
PubMed
Summary
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Researchers identified CD4+ T cells that recognize MHC class I molecules, not just MHC class II. These T-cell lines may be relevant for viral infections and cancer where TAP molecule expression is reduced.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • CD4+ T cells typically recognize Major Histocompatibility Complex (MHC) class II molecules.
  • MHC class I-restricted CD4+ T cells are rare but have been documented.

Purpose of the Study:

  • To isolate and characterize CD4+ T-cell lines reactive to MHC class I molecules.
  • To investigate the potential clinical relevance of these T cells in conditions with reduced Transporter Associated with Antigen Processing (TAP) expression.

Main Methods:

  • Co-culture of CD4+ peripheral blood T cells with T2 cells transfected with Human Leucocyte Antigen (HLA)-B27.
  • Inhibition assays using MHC class I-specific monoclonal antibodies (mAbs), including W6/32 and HLA-A2-specific MA2.1.

Main Results:

Related Experiment Videos

  • Six MHC class I-reactive CD4+ T-cell lines were successfully isolated.
  • Responses were confirmed to be MHC class I-specific via antibody inhibition.
  • Four T-cell lines were restricted by HLA-A2.
  • Three T-cell lines responded to HLA-B27 irrespective of the restricting allele.
  • These T cells recognized Transporter Associated with Antigen Processing (TAP)-deficient cells.

Conclusions:

  • Demonstrated the existence and characteristics of CD4+ T cells recognizing MHC class I.
  • Identified HLA-B27 as a potential source of peptides presented by stimulatory MHC class I alleles.
  • Highlighted the potential clinical significance of these T cells in viral infections and cancer due to their ability to recognize TAP-deficient cells.