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Avidity determines T-cell reactivity in abacavir hypersensitivity.

Jacqueline Adam1, Klara K Eriksson, Benno Schnyder

  • 1Clinic for Rheumatology and Clinical Immunology/Allergology, University Hospital of Bern, Switzerland.

European Journal of Immunology
|May 16, 2012
PubMed
Summary

Abacavir hypersensitivity involves CD8(+) T cells, but not drug metabolism. T-cell activation depends on T-cell receptor avidity and drug concentration, not proteasome processing, suggesting a non-haptenic mechanism.

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Area of Science:

  • Immunology
  • Pharmacology
  • Molecular Biology

Background:

  • Abacavir (abc) causes severe hypersensitivity in HLA-B*5701(+) individuals.
  • Understanding abacavir-specific CD8(+) T cell activation is crucial for managing hypersensitivity reactions.

Purpose of the Study:

  • To investigate the mechanism of abacavir-specific CD8(+) T cell activation.
  • To determine if drug metabolism or processing is involved in abacavir-induced T cell responses.

Main Methods:

  • Generation of abacavir-specific T-cell clones (abc-TCCs).
  • Assays for drug metabolizing enzyme expression and proteasome inhibition.
  • Calcium (Ca2+) influx assays and titration experiments to assess T-cell reactivity.
  • Analysis of T-cell receptor (TCR) avidity and activation kinetics.

Main Results:

  • Abacavir reactivity was independent of drug metabolism and proteasome processing.
  • All abc-TCCs recognized abacavir presented by HLA-B*5701.
  • A subset of abc-TCCs showed immediate reactivity to soluble abacavir, correlated with TCR avidity.
  • T-cell activation patterns were dynamic, influenced by drug concentration and TCR avidity.

Conclusions:

  • Abacavir-specific T-cell activation does not require drug metabolism or proteasome-mediated neo-antigen formation.
  • The mechanism differs from hapten-driven responses, suggesting direct drug-TCR interaction modulated by avidity and concentration.
  • Findings provide insights into the immunopathogenesis of abacavir hypersensitivity.