α-Gal present on both glycolipids and glycoproteins contributes to immune response in meat-allergic patients

Neera Chakrapani, Jörg Fischer, Kyra Swiontek, Françoise Codreanu-Morel, Farah Hannachi, Martine Morisset, Clément Mugemana, Dmitry Bulaev, Simon Blank, Carsten Bindslev-Jensen, Tilo Biedermann, Markus Ollert, Christiane Hilger*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

Background: The α-Gal syndrome is associated with the presence of IgE directed to the carbohydrate galactose-α-1,3-galactose (α-Gal) and is characterized by a delayed allergic reaction occurring 2 to 6 hours after ingestion of mammalian meat. On the basis of their slow digestion and processing kinetics, α-Gal–carrying glycolipids have been proposed as the main trigger of the delayed reaction. Objective: We analyzed and compared the in vitro allergenicity of α-Gal–carrying glycoproteins and glycolipids from natural food sources. Methods: Proteins and lipids were extracted from pork kidney (PK), beef, and chicken. Glycolipids were purified from rabbit erythrocytes. The presence of α-Gal and IgE binding of α-Gal–allergic patient sera (n = 39) was assessed by thin-layer chromatography as well as by direct and inhibition enzyme-linked immunosorbent assay. The in vitro allergenicity of glycoproteins and glycolipids from different meat extracts was determined by basophil activation test. Glycoprotein stability was evaluated by simulated gastric and intestinal digestion assays. Results: α-Gal was detected on glycolipids of PK and beef. Patient IgE antibodies recognized α-Gal bound to glycoproteins and glycolipids, although binding to glycoproteins was more potent. Rabbit glycolipids were able to strongly activate patient basophils, whereas lipid extracts from PK and beef were also found to trigger basophil activation, but at a lower capacity compared to the respective protein extracts. Simulated gastric digestion assays of PK showed a high stability of α-Gal–carrying proteins in PK. Conclusion: Both α-Gal–carrying glycoproteins and glycolipids are able to strongly activate patient basophils. In PK and beef, α-Gal epitopes seem to be less abundant on glycolipids than on glycoproteins, suggesting a major role of glycoproteins in delayed anaphylaxis upon consumption of these food sources.

Original languageEnglish
Pages (from-to)396-405.e11
JournalJournal of Allergy and Clinical Immunology
Volume150
Issue number2
Early online date12 Apr 2022
DOIs
Publication statusPublished - Aug 2022

Keywords

  • anaphylaxis
  • basophil activation
  • galactose-α-1,3-galactose
  • Glycolipids
  • in vitro digestion
  • micelle formation
  • pork kidney
  • red meat allergy
  • α-Gal syndrome

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