Characterization of a 7 kDa pollen allergen belonging to the gibberellin-regulated protein family from three Cupressaceae species.
Clin Exp Allergy
; 50(8): 964-972, 2020 08.
Article
in En
| MEDLINE
| ID: mdl-32506709
ABSTRACT
BACKGROUND:
Severe allergy to fruits mediated by a 7 kDa allergen belonging to the gibberellin-regulated protein (GRP) family is known to be associated with Cupressaceae pollinosis.OBJECTIVE:
To identify and characterize Cupressaceae pollen allergens involved in GRP-related fruit allergy.METHODS:
Pru p 7-related proteins from pollen of Cupressus sempervirens, Juniperus ashei and Cryptomeria japonica were identified using a rabbit anti-Pru p 7 antiserum, purified chromatographically and sequenced by mass spectrometry and bioinformatic comparisons. The C sempervirens protein was produced as a recombinant allergen in Pichia pastoris. IgE antibody binding to pollen GRP proteins was analysed in a peach allergic (n = 54) and a cypress pollen allergic (n = 88) patient population from southern France using ImmunoCAP.RESULTS:
In each of the three Cupressaceae species studied, a 7 kDa pollen protein related to Pru p 7 was identified and found to comprise an amino acid sequence of 63 residues in length, 92%-98% identical to each other and 67%-68% identical to Pru p 7. The C sempervirens, J ashei and C japonica GRP allergens have been officially recognized by the WHO/IUIS Allergen Nomenclature Sub-Committee and named Cup s 7, Jun a 7 and Cry j 7, respectively. Recombinant Cup s 7 showed IgE antibody binding capacity comparable to that of the purified natural allergen. Among 51 peach allergic subjects sensitized to Pru p 7, substantially higher levels of IgE to Cup s 7 than to Pru p 7 were found. Further, the pollen protein was able to completely outcompete IgE binding to Pru p 7, while the reverse competition effect was modest, consistent with primary sensitization by the pollen allergen. CONCLUSION AND CLINICAL RELEVANCE Pru p 7-related pollen allergens from three Cupressaceae species have been characterized and may become useful for the identification of pollinosis patients at risk of developing severe fruit allergy.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pollen
/
Allergens
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Rhinitis, Allergic, Seasonal
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Cupressaceae
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Antigens, Plant
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Food Hypersensitivity
Type of study:
Diagnostic_studies
/
Prognostic_studies
Limits:
Adolescent
/
Adult
/
Aged
/
Child
/
Child, preschool
/
Female
/
Humans
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Male
/
Middle aged
Language:
En
Journal:
Clin Exp Allergy
Journal subject:
ALERGIA E IMUNOLOGIA
Year:
2020
Document type:
Article
Affiliation country: