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Amb a 1 isoforms: Unequal siblings with distinct immunological features.

M Wolf1, T E Twaroch2, S Huber1

  • 1Department of Molecular Biology, University of Salzburg, Salzburg, Austria.

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|May 3, 2017
PubMed
Summary

Ragweed allergen Amb a 1 isoforms have varying immunological properties. Amb a 1.01 shows high IgE binding, while combinations of isoforms may improve ragweed allergy immunotherapy.

Keywords:
Amb a 1 allergenallergenicitycross-reactivityimmunogenicityragweed pollen allergy

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Area of Science:

  • Allergen immunotherapy
  • Immunology
  • Molecular allergology

Background:

  • Ragweed pollen is a significant allergy trigger.
  • Ragweed extracts contain five Amb a 1 allergen isoforms.
  • Immunological differences among Amb a 1 isoforms are not fully understood.

Purpose of the Study:

  • Compare physicochemical and immunological properties of three key Amb a 1 isoforms.
  • Evaluate IgE binding and T-cell responses.
  • Assess in vitro and in vivo immunogenicity.

Main Methods:

  • Purification and physicochemical characterization of Amb a 1 isoforms.
  • Assessment of antibody binding (IgE, IgG).
  • Induction of human T-cell proliferation and mouse immunization models.

Main Results:

  • Amb a 1 isoforms display distinct IgE binding and immunogenicity.
  • Amb a 1.01 exhibits higher IgE binding than isoforms 02 and 03.
  • Isoforms 01 and 03 are potent stimulators of patient T cells; Amb a 1.01 induces higher IgG/IgE in mice.

Conclusions:

  • Naturally occurring Amb a 1 isoforms differ in immunogenic and sensitizing potential.
  • Amb a 1.01 is crucial for diagnostic tests due to high IgE binding.
  • Combining Amb a 1 isoforms may enhance ragweed allergy immunotherapy strategies.