Systemic allergic reaction to coconut (Cocos nucifera) in 2 subjects with hypersensitivity to tree nut and demonstration of cross-reactivity to legumin-like.

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Systemic allergic reaction to coconut (Cocos nucifera) in 2 subjects with hypersensitivity to tree nut and demonstration of cross-reactivity to legumin-like seed storage proteins: New coconut and walnut food allergens Suzanne S. Teuber, MDa,b, W.Rich Peterson, BSb Journal of Allergy and Clinical Immunology Volume 103, Issue 6, Pages 1180-1185 (June 1999) DOI: 10.1016/S0091-6749(99)70196-X Copyright © 1999 Mosby, Inc. Terms and Conditions

Fig. 1 Coomassie-stained SDS-PAGE of coconut extract. MW, Molecular weight markers; R, reducing conditions (dithiothreitol present); NR, nonreducing conditions. Journal of Allergy and Clinical Immunology 1999 103, 1180-1185DOI: (10.1016/S0091-6749(99)70196-X) Copyright © 1999 Mosby, Inc. Terms and Conditions

Fig. 2 IgE immunoblot of coconut extract under nonreducing conditions. Lane 1, Patient 1; lane 2, patient 2 ; lane C, control atopic sera; lane 2°, secondary antibody only (125I anti-human IgE). Only faint banding is present in both patients. Journal of Allergy and Clinical Immunology 1999 103, 1180-1185DOI: (10.1016/S0091-6749(99)70196-X) Copyright © 1999 Mosby, Inc. Terms and Conditions

Fig. 3 Coconut IgE immunoblot under reducing conditions and preabsorption of sera with extracts from walnut, almond, peanut, or ovalbumin. Results for patient 1 and patient 2 are shown separately as indicated. N, No other nut extract added, standard reduced immunoblot against coconut extract; C, sera preabsorbed with coconut extract; W, sera preabsorbed with walnut extract before incubation with the coconut extract strip; A, sera preabsorbed with almond kernel extract; P, sera preabsorbed with peanut kernel extract; Ov, sera preabsorbed with ovalbumin, an irrelevant protein control. Control atopic sera and the secondary antibody alone (buffer control) showed no reactivity and are not shown. Journal of Allergy and Clinical Immunology 1999 103, 1180-1185DOI: (10.1016/S0091-6749(99)70196-X) Copyright © 1999 Mosby, Inc. Terms and Conditions

Fig. 4 Walnut kernel IgE immunoblot under reducing conditions and preabsorption of sera with nuts, coconut, or ovalbumin. Results for patient 1 and patient 2 are shown separately as indicated. N, No preabsorption of sera with another antigen (standard IgE immunoblot against walnut kernel); W, sera preabsorbed with walnut extract; C, sera preabsorbed with coconut extract (the arrow indicates the absence of a faint band at 36 kd; A, sera preabsorbed with almond extract; P, sera preabsorbed with peanut extract; Ov, sera preabsorbed with ovalbumin. Control atopic sera and the secondary antibody alone (buffer control) showed no reactivity and are not shown. Journal of Allergy and Clinical Immunology 1999 103, 1180-1185DOI: (10.1016/S0091-6749(99)70196-X) Copyright © 1999 Mosby, Inc. Terms and Conditions