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Fine structural specificity differences of trimethoprim allergenic determinants

N H Pham1, B A Baldo, M Manfredi

  • 1Molecular Immunology Laboratory, Kolling Institute of Medical Research, Royal North Shore Hospital of Sydney, St Leonards, New South Wales, Australia.

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
|October 1, 1996
PubMed
Summary

Trimethoprim allergy involves diverse IgE-binding determinants, with even single methoxy group differences impacting recognition. Identifying these structures improves diagnostic assays for trimethoprim hypersensitivity.

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Area of Science:

  • Immunology
  • Pharmacology
  • Allergy Research

Background:

  • Adverse reactions to trimethoprim, a common antibacterial, are frequent.
  • Immediate hypersensitivity reactions are a concern.
  • Research is advancing immunoassay development for diagnosing type 1 allergic reactions to trimethoprim.

Purpose of the Study:

  • To investigate the molecular basis of IgE binding to trimethoprim.
  • To define fine structural recognition differences in patient sera.
  • To enhance the specificity, sensitivity, and diagnostic value of immunoassays.

Main Methods:

  • Immunoassays for specific IgE antibodies.
  • Quantitative hapten inhibition studies using trimethoprim and structural analogues.
  • Analysis of sera from eight clinically confirmed trimethoprim-allergic subjects.

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Main Results:

  • Three distinct allergenic determinant structures on the trimethoprim molecule were identified.
  • The 3,4-dimethoxybenzyl group was confirmed as a determinant.
  • The 2,4-diamino-5-(3',4'-dimethoxybenzyl) pyrimidine group was identified as a second determinant.
  • Evidence suggested the entire trimethoprim molecule may act as a third determinant in some cases.

Conclusions:

  • Heterogeneity exists in trimethoprim IgE-binding determinants.
  • Fine structural differences, like a single methoxy group, are significant.
  • The identification of three determinants highlights the complexity and heterogeneity of trimethoprim allergy.