Ara h 8, a Bet v 1-homologous allergen from peanut, is a major allergen in patients with combined birch pollen and peanut allergy
article
We recently described patients with soybean allergy mainly mediated by cross-reactivity to birch pollen allergens. A majority of those patients were reported to have peanut allergy. We sought to study the occurrence of peanut allergy in patients allergic to birch pollen and characterized the Bet v 1-homologous peanut allergen Ara h 8. Recombinant Ara h 8 was cloned with degenerated primers and expressed in Escherichia coli. Nine Swiss and 11 Dutch patients with peanut and birch pollen allergy and a positive double-blind, placebo-controlled food challenge result to peanut were investigated for IgE reactivity to birch pollen and purified peanut allergens and cross-reactivity between birch and peanut. Ara h 8 stability against digestion and roasting was assessed by means of RAST inhibition. The IgE cross-linking potency of Ara h 8 was tested on the basis of basophil histamine release. During double-blind, placebo-controlled food challenge, all patients experienced symptoms in the oral cavity, progressing to more severe symptoms in 40% of patients. CAP-FEIA detected recombinant (r) Ara h 8-specific IgE in 85%. IgE binding to Ara h 8 was inhibited by Bet v 1 in peanut extract immunoblotting and in RAST inhibition. In EAST inhibition recombinant rAra h 8 inhibited IgE binding to peanut in 4 of 7 tested patient sera. Antipeanut response was dominated by Ara h 8 in 12 of 17 tested patients. Furthermore, our results demonstrate a low stability of Ara h 8 to roasting and no stability to gastric digestion. Basophil histamine release with rAra h 8 was more than 20% in 5 of 7 tested sera. Peanut allergy might be mediated in a subgroup of our patients by means of cross-reaction of Bet v 1 with the homologous peanut allergen Ara h 8.
Topics
Food technologyAra h 8Birch pollen-related food allergyDiagnosisDouble-blindGly m 4LegumesOral allergy syndromePeanut allergyPlacebo-controlled food challengeRecombinant allergenAllergenAra h 8 allergenBet v 1 allergenHistamineUnclassified drugAdultAmino acid sequenceAntigen antibody reactionAntigen specificityBasophilBirchBlood analysisClinical articleControlled studyCross linkingCross reactionDigestionFemaleHistamine releaseHumanImmunoblottingMaleMolecular cloningMouth cavityPeanut allergyPollen allergyPriority journalProvocation testAdolescentAdultAllergensAmino Acid SequenceBasophilsBetulaCross ReactionsDouble-Blind MethodFemaleHistamine ReleaseHumansImmunoglobulin EMaleMolecular Sequence DataPeanut HypersensitivityPepsin APollenRecombinant Proteins
TNO Identifier
238247
ISSN
00916749
Source
Journal of Allergy and Clinical Immunology, 114(6), pp. 1410-1417.
Pages
1410-1417
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