title: Dissecting cross-reactivity in hymenoptera venom allergy by circumvention of alpha-1,3-core fucosylation.
abstract: Hymenoptera venom allergy is known to cause life-threatening and sometimes fatal IgE-mediated anaphylactic reactions in allergic individuals. About 30-50% of patients with insect venom allergy have IgE antibodies that react with both honeybee and yellow jacket venom. Apart from true double sensitisation, IgE against cross-reactive carbohydrate determinants (CCD) are the most frequent cause of multiple reactivities severely hampering the diagnosis and design of therapeutic strategies by clinically irrelevant test results. In this study we addressed allergenic cross-reactivity using a recombinant approach by employing cell lines with variant capacities of alpha-1,3-core fucosylation. The venom hyaluronidases, supposed major allergens implicated in cross-reactivity phenomena, from honeybee (Api m 2) and yellow jacket (Ves v 2a and its putative isoform Ves v 2b) as well as the human alpha-2HS-glycoprotein as control, were produced in different insect cell lines. In stark contrast to production in Trichoplusia ni (HighFive) cells, alpha-1,3-core fucosylation was absent or immunologically negligible after production in Spodoptera frugiperda (Sf9) cells. Consistently, co-expression of honeybee alpha-1,3-fucosyltransferase in Sf9 cells resulted in the reconstitution of CCD reactivity. Re-evaluation of differentially fucosylated hyaluronidases by screening of individual venom-sensitised sera emphasised the allergenic relevance of Api m 2 beyond its carbohydrate epitopes. In contrast, the vespid hyaluronidases, for which a predominance of Ves v 2b could be shown, exhibited pronounced and primary carbohydrate reactivity rendering their relevance in the context of allergy questionable. These findings show that the use of recombinant molecules devoid of CCDs represents a novel strategy with major implications for diagnostic and therapeutic approaches.
authors.affiliation: Institute of Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany.
authors.forename: Henning
authors.initials: H
authors.lastname: Seismann
authors.forename: Simon
authors.initials: S
authors.lastname: Blank
authors.forename: Ingke
authors.initials: I
authors.lastname: Braren
authors.forename: Kerstin
authors.initials: K
authors.lastname: Greunke
authors.forename: Liliana
authors.initials: L
authors.lastname: Cifuentes
authors.forename: Thomas
authors.initials: T
authors.lastname: Grunwald
authors.forename: Reinhard
authors.initials: R
authors.lastname: Bredehorst
authors.forename: Markus
authors.initials: M
authors.lastname: Ollert
authors.forename: Edzard
authors.initials: E
authors.lastname: Spillner
mesh_terms: D000818:Animals; D001514:Bee Venoms / Q000276:immunology*; D001798:Blood Proteins / Q000276:immunology*; D002241:Carbohydrates / Q000276:immunology; D002460:Cell Line; D003001:Cloning, Molecular; D003429:Cross Reactions / Q000276:immunology*; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D005643:Fucose / Q000378:metabolism*; D005647:Fucosyltransferases / Q000378:metabolism; D006801:Humans; D006821:Hyaluronoglucosaminidase / Q000378:metabolism; D006967:Hypersensitivity / Q000276:immunology*; D007114:Immunization; D015151:Immunoblotting; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology; D010641:Phenotype; D011994:Recombinant Proteins / Q000276:immunology; D013347:Subcellular Fractions / Q000201:enzymology; D014862:Wasp Venoms / Q000276:immunology*; D060749:alpha-2-HS-Glycoprotein
chemical_list: C556354:AHSG protein, human; D001514:Bee Venoms; D001798:Blood Proteins; D002241:Carbohydrates; D011994:Recombinant Proteins; D014862:Wasp Venoms; D060749:alpha-2-HS-Glycoprotein; D005643:Fucose; D007073:Immunoglobulin E; D005647:Fucosyltransferases; D006821:Hyaluronoglucosaminidase