Abstract:
BACKGROUND:The so-called 'latex-fruit syndrome' is a well-documented phenomenon in cross-reactive allergies. By contrast, there is a lack of information about allergy to exotic fruits in patients with a predominant pollen sensitization. Since the ubiquitous protein profilin has been identified as an allergen in natural rubber latex as well as in pollen-related foods, the aim of this study was to investigate the role of profilin in allergy to certain exotic fruits. METHODS:Recombinant profilins from banana and pineapple were cloned by a PCR technique after isolation of total RNA using degenerated profilin-specific primers. The unknown 5' ends of copy DNA (cDNA) were identified by rapid amplification of 5'cDNA ends (5'-RACE) and expression in Escherichia coli BL21(DE3) cells. The recombinant profilins were purified by affinity chromatography using poly-(L)-proline as the solid phase. IgE-binding capabilities were characterized by means of immunoblot and Enzyme Allergosorbent Test (EAST). The cross-reactivity to birch pollen profilin and latex profilin was studied by EAST as well as by immunoblot inhibition experiments. RESULTS:Both banana and pineapple profilin were found to consist of 131 amino acid residues with high amino acid sequence identity to known allergenic pollen and food profilins (71-84%). IgE binding to the recombinant profilins was observed in 7/16 sera from subjects with suspected banana allergy (44%) and in 8/19 sera from subjects with suspected pineapple allergy (42%). Inhibition experiments indicated similar IgE reactivity of natural and recombinant allergens. In addition, high cross-reactivity to birch pollen profilin Bet v 2 and latex profilin Hev b 8 was demonstrated by immunoblot inhibition as well as EAST inhibition experiments. CONCLUSIONS:Since a high IgE-binding prevalence of about 40% was obtained in both banana and pineapple allergy, we conclude that profilin is an important mediator of IgE cross-reactivity between pollen and exotic fruits.
journal_name
Int Arch Allergy Immunoljournal_title
International archives of allergy and immunologyauthors
Reindl J,Rihs HP,Scheurer S,Wangorsch A,Haustein D,Vieths Sdoi
10.1159/000059400keywords:
subject
Has Abstractpub_date
2002-06-01 00:00:00pages
105-14issue
2eissn
1018-2438issn
1423-0097pii
59400journal_volume
128pub_type
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journal_title:International archives of allergy and immunology
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journal_title:International archives of allergy and immunology
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journal_title:International archives of allergy and immunology
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journal_title:International archives of allergy and immunology
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journal_title:International archives of allergy and immunology
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journal_title:International archives of allergy and immunology
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journal_title:International archives of allergy and immunology
pub_type: 杂志文章
doi:10.1159/000024059
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journal_title:International archives of allergy and immunology
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