PMID: 7545879Mar 1, 1995Paper

Multiplicity of cross-reactive epitopes on Bet v I as detected with monoclonal antibodies and human IgE

Allergy
Jaap H AkkerdaasR C Aalberse

Abstract

Six monoclonal antibodies against Bet v I, the major cross-reactive allergen of birch pollen (Betula verrucosa), were obtained. Four did not react with fruits, but two monoclonal antibodies (mAbs) (5H8 and 9C11) were reactive with apple and other fruits. These two cross-reactive antibodies reacted with identical or overlapping sites, but differed in their relative degree of cross-reactivity toward various fruits and hazelnut. Cross-reactive human IgE antibodies reacted with a nonoverlapping epitope, as indicated by results of a two-site radioimmunoassay (RIA) with the fruit-reactive mAb 9C11. By isoelectric focusing (IEF) in conjunction with immunoblotting, a maximum of seven isoforms could be distinguished. Depletion of birch-pollen extract for Bet v I with the most reactive mAb (7F7) removed approximately 95% of the IgE cross-reactivity between birch pollen and apple extract. The remaining 5% cross-reactive material was still capable of inhibiting the binding of IgE to apple allergen completely, and was reactive with mAbs 5H8 and 3C4. By means of IEF/immunoblot, it was shown that these mAbs recognize an isoform of Bet v I that is poorly, if at all, recognized by mAb 7F7. These results illustrate the heterogeneity of Bet v I, ...Continue Reading

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