Hypersensitivity to mugwort (Artemisia vulgaris) in patients with peach allergy is due to a common lipid transfer protein allergen and is often without clinical expression

Elide A. Pastorello, Valerio Pravettoni, Laura Farioli, Federica Rivolta, Amedeo Conti, Marco Ispano, Donatella Fortunato, Anders Bengtsson, Matilde Bianchi

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The observation of mugwort-specific IgE antibodies in patients with peach allergy suggests that mugwort sensitization might play a role in sensitization to peach. Objective: We sought to study the clinical manifestations of mugwort hypersensitivity in patients with peach allergy, identify the common allergens, and evaluate their IgE cross-reactivity. Methods: Patients with oral allergy syndrome for peach and specific IgE antibodies to mugwort were investigated for respiratory symptoms during the mugwort season. Peach and mugwort allergens were identified by means of SDS-PAGE and IgE immunoblotting. Immunoblotting inhibition experiments were done to study cross-reactivity between peach and mugwort and other pollens. Results: Seventeen patients were studied, 10 with no seasonal respiratory symptoms and 7 with clear late summer respiratory symptoms. In IgE immunoblotting the 10 asymptomatic patients reacted only to a 9-kd allergen of both mugwort and peach, whereas the 7 patients with pollinosis reacted to other allergens. Ten patients with mugwort allergy, no history of allergy to peach, and negative results for peach-specific IgE antibodies were also studied. The mugwort 9-kd protein was identified as a lipid transfer protein (LTP) homologous to peach LTP. Immunoblotting inhibition showed that IgE binding to the peach 9-kd band was totally inhibited by 4 μg of peach LTP but only by 400 μg of mugwort LTP, whereas 4 μg of both mugwort and peach LTP totally inhibited the mugwort immunoblotting. The results were similar with other pollens. Conclusions: Patients sensitized only to the 9-kd LTP of mugwort do not present hay fever symptoms, and this sensitization is a consequence of the peach sensitization.

Original languageEnglish
Pages (from-to)310-317
Number of pages8
JournalJournal of Allergy and Clinical Immunology
Volume110
Issue number2
DOIs
Publication statusPublished - Aug 2002

Keywords

  • Cross-reactivity
  • Lipid transfer protein
  • Mugwort pollen
  • Oral allergy syndrome

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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