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Titre du document / Document title

The maize major allergen, which is responsible for food-induced allergic reactions, is a lipid transfer protein

Auteur(s) / Author(s)

PASTORELLO Elide A. (1) ; FARIOLI Laura (2) ; PRAVETTONI Valerio (1) ; ISPANO Marco (3) ; SCIBOLA Elisabetta (1) ; TRAMBAIOLI Chiara (1) ; GIUFFRIDA Maria Gabriella (4) ; ANSALONI Raffaella (5) ; GODOVAC-ZIMMERMANN Jasminka (5) ; CONTI Amedeo (4) ; FORTUNATO Donatella (4) ; ORTOLANI Claudio (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Allergy Centre, 3rd Division of General Medicine, Ospedale Maggiore IRCCS, Milan, ITALIE
(2) UOOML, CEMOC, ICP, Milan, ITALIE
(3) Bizzozzero Division, Niguarda Ca' Granda Hospital, Milan, ITALIE
(4) National Research Council, Torino, ITALIE
(5) Centre for Molecular Medicine, University-College, ROYAUME-UNI

Résumé / Abstract

Background: Cereals are the most important nutritional component in the human diet. Food-induced allergic reactions to these substances therefore have serious implications, and exhaustive diagnosis is required. Such diagnosis is still difficult because of the incomplete knowledge about major cereal allergens. In particular, few food-induced allergic reactions to maize have been reported, and no information on the allergenic proteins is available. Objective: Having observed several anaphylactic reactions to maize, we planned a study to identify maize major allergens and cross-reactivity with other cereals, as well as to peach because the majority of patients also reacted to Prunoideae fruits. Methods: Twenty-two patients with systemic symptoms after maize ingestion and positive skin prick test responses and serum-specific IgE antibodies to maize were selected. The IgE-reactivity pattern was identified by SDS-PAGE and immunoblotting. The major allergen identified was then purified by HPLC and characterized by mass spectrometry, determination of the isoelectric point value, and N-terminal amino acid sequencing. Results: Sera from 19 (86%) of the 22 patients recognized a 9-kd protein, thus confirming this as the maize major allergen. This protein had an isoelectric point of greater than 9, a molecular mass of 9047.0 d, and no glycosylation. Determination of its N-terminal sequence showed that it was a lipid transfer protein (LTP). By using immunoblotting-inhibition experiments, we demonstrated that the LTP cross-reacts completely with rice and peach LTPs but not with wheat or barley LTPs. N-terminal sequence of the 16-kd allergen (recognized by 36% of patients) showed it to be the maize inhibitor of trypsin. This protein cross-reacts completely with grass, wheat, barley, and rice trypsin inhibitors. Conclusion: The major allergen of maize is an LTP with a molecular weight of 9 kd that is highly homologous with the peach LTP, the major allergen of the Prunoideae subfamily.

Revue / Journal Title

Journal of allergy and clinical immunology    ISSN  0091-6749   CODEN JACIBY 

Source / Source

2000, vol. 106, no4, pp. 744-751 (27 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, New York, NY, ETATS-UNIS  (1971) (Revue)

Mots-clés anglais / English Keywords

Allergy

;

Allergen

;

Food

;

Corn

;

Cross reaction

;

Peach

;

Rice

;

Pollen

;

Gramineae

;

Human

;

Lipid transfer protein

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Immunopathology

;

Mots-clés français / French Keywords

Allergie

;

Allergène

;

Aliment

;

Maïs

;

Réaction croisée

;

Pêche(fruit)

;

Riz

;

Pollen

;

Gramineae

;

Homme

;

Protéine LTP

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Immunopathologie

;

Mots-clés espagnols / Spanish Keywords

Alergia

;

Alergeno

;

Alimento

;

Maiz

;

Reacción cruzada

;

Durazno

;

Arroz

;

Polen

;

Gramineae

;

Hombre

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Inmunopatología

;

Localisation / Location

INIST-CNRS, Cote INIST : 2059, 35400009114159.0190

Nº notice refdoc (ud4) : 792690



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