Abstract | BACKGROUND: Decreased serum food-specific IgA antibodies have been associated with allergic disease in cross-sectional, case-control studies. The purpose of this study was to prospectively compare egg-white-(EW)-specific IgA and IgA2 levels between egg-allergic children and children tolerating egg. METHODS: Seventeen egg-allergic children were followed prospectively. Total IgA, EW-specific IgA, and EW-specific IgA2 levels were measured in their sera with a sensitive ELISA. As negative controls were used children with no previous history of egg allergy. Egg-allergic children with or without concomitant milk allergy were evaluated as additional controls with measurement of casein-specific IgA. RESULTS: After 2.5 ± 0.9 yrs, nine out of the 17 allergic children became tolerant and eight remained allergic to baked egg. Baseline EW-specific IgA2 levels were significantly lower in the egg-allergic subjects (median 23.9 ng/ml) compared with the negative control subjects (99.4 ng/ml) and increased significantly by 28% over the study time period in eight out of the nine allergic children that became tolerant to baked egg. There was no significant change over time in EW-specific IgA in any of the study groups. Non-milk-allergic subjects with concomitant egg allergy had almost threefold higher casein-specific IgA levels than the milk- and egg-allergic subjects (p = 0.025). CONCLUSIONS: These results suggest a potential role for allergen-specific IgA2 antibodies in the induction of food tolerance. Furthermore, they support the hypothesis that immature or impaired production of allergen-specific IgA2 may be associated with the pathophysiology of food allergy, a defect that seems to be selective for the culprit allergen.
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Authors | George N Konstantinou, Anna Nowak-Węgrzyn, Ramon Bencharitiwong, Luda Bardina, Scott H Sicherer, Hugh A Sampson |
Journal | Pediatric allergy and immunology : official publication of the European Society of Pediatric Allergy and Immunology
(Pediatr Allergy Immunol)
Vol. 25
Issue 1
Pg. 64-70
(Feb 2014)
ISSN: 1399-3038 [Electronic] England |
PMID | 24118158
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Copyright | © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. |
Chemical References |
- Allergens
- Caseins
- Egg Proteins, Dietary
- Immunoglobulin A
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Topics |
- Allergens
(immunology)
- Animals
- Caseins
(immunology)
- Cattle
- Child, Preschool
- Egg Hypersensitivity
(complications, immunology)
- Egg Proteins, Dietary
(immunology)
- Female
- Follow-Up Studies
- Humans
- Immune Tolerance
- Immunity, Humoral
- Immunoglobulin A
(blood, immunology)
- Infant
- Male
- Milk Hypersensitivity
(complications, immunology)
- Prospective Studies
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