Background: The well-established murine model of IgE-mediated food allergy, based on oral administration of antigen and cholera toxin (CT), has within the previous years been used to evaluate various food proteins. Nonetheless, little knowledge on the factors that determine the allergenicity of food proteins is available so far. The use of proteins from the legume seed Lupinus albus as food ingredients calls for an evaluation of their allergenic potential, and therefore, we applied the cited model to investigate the putative allergenicity of three lupin protein preparations representing different matrices in which the four types of conglutins are present in varying concentrations. Methods: Weekly, BALB/c A mice were orally immunized with the three lupin protein products together with CT. Total specific antibodies and IgE were determined by ELISA and Western blotting. Results: A dose-dependent Ig response against the analyzed proteins was observed for all three lupin products, while IgE responses against conglutins β, γ and δ, but not against conglutin α, were primarily detected after oral administration of lupin flakes. Whereas no differences among the samples for total specific Ig responses were seen, orally administered lupin flake extracts were much more efficient in inducing a conglutin-specific IgE response compared with fractionated lupin protein products. Conclusions: Although the lupin-specific Ig response induced by coadministration of CT and lupin proteins appears to be dose dependent, the IgE response appears to depend merely on some intrinsic properties of the proteins as well as some factors of the protein matrix. Copyright

Assessment of lupin allergenicity in the cholera toxin model : induction of IgE response depends on the intrinsic properties of the conglutins and matrix effects / N. Foss, M. Duranti, C. Magni, H. Frøkiær. - In: INTERNATIONAL ARCHIVES OF ALLERGY AND IMMUNOLOGY. - ISSN 1018-2438. - 141:2(2006), pp. 141-150.

Assessment of lupin allergenicity in the cholera toxin model : induction of IgE response depends on the intrinsic properties of the conglutins and matrix effects

M. Duranti
Secondo
;
C. Magni
Penultimo
;
2006

Abstract

Background: The well-established murine model of IgE-mediated food allergy, based on oral administration of antigen and cholera toxin (CT), has within the previous years been used to evaluate various food proteins. Nonetheless, little knowledge on the factors that determine the allergenicity of food proteins is available so far. The use of proteins from the legume seed Lupinus albus as food ingredients calls for an evaluation of their allergenic potential, and therefore, we applied the cited model to investigate the putative allergenicity of three lupin protein preparations representing different matrices in which the four types of conglutins are present in varying concentrations. Methods: Weekly, BALB/c A mice were orally immunized with the three lupin protein products together with CT. Total specific antibodies and IgE were determined by ELISA and Western blotting. Results: A dose-dependent Ig response against the analyzed proteins was observed for all three lupin products, while IgE responses against conglutins β, γ and δ, but not against conglutin α, were primarily detected after oral administration of lupin flakes. Whereas no differences among the samples for total specific Ig responses were seen, orally administered lupin flake extracts were much more efficient in inducing a conglutin-specific IgE response compared with fractionated lupin protein products. Conclusions: Although the lupin-specific Ig response induced by coadministration of CT and lupin proteins appears to be dose dependent, the IgE response appears to depend merely on some intrinsic properties of the proteins as well as some factors of the protein matrix. Copyright
Antigen-specific immunoglobulin E; Cholera toxin; Lupin conglutins
Settore BIO/10 - Biochimica
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/24770
Citazioni
  • ???jsp.display-item.citation.pmc??? 3
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 22
social impact