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J Investig Allergol Clin Immunol. 2016;26(6):355-361. doi: 10.18176/jiaci.0053.

IgE-Api m 4 Is Useful for Identifying a Particular Phenotype of Bee Venom Allergy.

Author information

1
Maimonides Biomedical Research Institute of Cordoba (IMIBIC).
2
Department of Allergology, Reina Sofia University Hospital, Córdoba, Spain.

Abstract

BACKGROUND AND OBJECTIVE:

Different clinical behaviors have been identified in patients allergic to bee venom. Compound-resolved diagnosis could be an appropriate tool for investigating these differences. The aims of this study were to analyze whether specific IgE to Api m 4 (sIgE-Api m 4) can identify a particular kind of bee venom allergy and to describe response to bee venom immunotherapy (bVIT).

METHODS:

Prospective study of 31 patients allergic to bee venom who were assigned to phenotype group A (sIgE-Api m 4 <0.98 kU/L), treated with native aqueous (NA) extract, or phenotype group B (sIgE-Api m 4 ≥0.98 kU/L), treated with purified aqueous (PA) extract. Sex, age, cardiovascular risk, severity of preceding sting reaction, exposure to beekeeping, and immunological data (intradermal test, sIgE/sIgG4-Apis-nApi m 1, and sIgE-rApi m 2-Api m 4 were analyzed. Systemic reactions (SRs) during bVIT build-up were analyzed. Immunological and sting challenge outcomes were evaluated in each group after 1 and 2 years of bVIT.

RESULTS:

Phenotype B patients had more severe reactions (P=.049) and higher skin sensitivity (P=.011), baseline sIgE-Apis (P=.0004), sIgE-nApi m 1 (P=.0004), and sIgG4-Apis (P=.027) than phenotype A patients. Furthermore, 41% of patients in group B experienced SRs during the build-up phase with NA; the sting challenge success rate in this group was 82%. There were no significant reductions in serial intradermal test results, but an intense reduction in sIgE-nApi m 1 (P=.013) and sIgE-Api m 4 (P=.004) was observed after the first year of bVIT.

CONCLUSION:

Use of IgE-Api m 4 as the only discrimination criterion demonstrated differences in bee venom allergy. Further investigation with larger populations is necessary.

KEYWORDS:

Bee venom allergens; Bee venom immunotherapy; Component-resolved diagnosis; Sting challenge; Systemic reaction.

PMID:
27996941
DOI:
10.18176/jiaci.0053
[Indexed for MEDLINE]
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