Sensitization to grass pollen allergen molecules in a birth cohort-natural Phl p 4 as an early indicator of grass pollen allergy.
J Allergy Clin Immunol
; 145(4): 1174-1181.e6, 2020 04.
Article
em En
| MEDLINE
| ID: mdl-31954777
ABSTRACT
BACKGROUND:
Grass pollen allergy is one of the most common allergies worldwide.OBJECTIVE:
The aim of this study was to evaluate the usefulness of grass pollen allergen molecules for prediction of grass pollen allergy during childhood and up to adolescence.METHOD:
Questionnaire data and sera obtained from the study subjects at the ages of 4, 8, and 16 years from the population-based Barn/Children Allergy Milieu Stockholm Epidemiology birth cohort were used. Sera from 763 representative subjects with serum samples available at all 3 ages were analyzed for IgE reactivity to 8 Phleum pratense (Phl p) allergens (MeDALL [Mechanisms for the Development of Allergies] chip) and to timothy grass extract (ImmunoCAP). Allergic rhinitis to grass pollen (ARg) was defined as upper airway symptoms during grass pollen exposure.RESULTS:
The prevalence of sensitization to any Phl p molecule was higher compared with that to timothy extract at all 3 ages at the age of 4 years, 9.7% versus 6.8%; at the age of 8 years, 28.4% versus 15.3%; and at the age of 16 years, 37.1% versus 27.1%. General estimating equations analyses revealed that among children sensitized at the age of 4 years, the overall odds ratio (OR) of later ARg (up to 16 years) was increased only for IgE reactivity to Phl p 1 (OR = 4.9) and natural Phl p 4 (OR = 6.9). The likelihood of later symptoms increased with the number of allergen molecules; at the age of 4 years, 2 or more molecules predicted ARg to 78% and 3 or more molecules predicted ARg to 95%. A positive test result for timothy extract predicted ARg to 70%.CONCLUSIONS:
Natural Phl p 4 is a hitherto unrecognized early indicator of grass pollen allergy, in addition to Phl p 1. To identify grass pollen sensitization and predict later ARg, allergen molecules are of added value to timothy extract alone and may help clinicians improve prediction of grass pollen allergy.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Proteínas de Plantas
/
Imunoglobulina E
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Alérgenos
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Extratos Vegetais
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Rinite Alérgica
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article