Evaluation of patatin as a major cross-reactive allergen in latex-induced potato allergy.
Potential cross-reactions between natural rubber latex and fruit/vegetable specific immunoglobulin (Ig)E antibodies have been reported for many years. This study was designed to investigate the molecular basis of acquired food sensitization focusing on the storage protein patatin and the patatin-like latex protein Hev b 7.



The amount of potato-specific IgE in the serum of latex-allergic health care workers and children with atopic dermatitis was determined to evaluate cross-reactivity between Hev b 7 and patatin. Additionally, the stability of potato patatin to digestion was investigated.



Human serum was tested on its reactivity to latex and potato proteins by IgE immunoblotting after one-dimensional (1-D) and 2-D electrophoresis. Latex- and potato-specific IgE concentrations were measured in fluorescence enzyme immunoassays (CAP, Pharmacia, Uppsala, Sweden). Further, potato patatin was chromatographically isolated to perform auto-inhibition tests. Stability of patatin to degradation was determined by digestion in vitro.



Patatin was identified as major cross-reactive potato allergen by N-terminal sequencing. Seventy-five percent of the potato-sensitized people reacted with patatin in 1-D immunoblots, and 25% of the positive reactions to Hev b 7 could be blocked by preincubation of the patients' sera with purified potato patatin. Examination of children with atopic dermatitis showed that most sera contained patatin-specific IgE, whereas no Hev b 7-specific IgE was detected. Finally, patatin has been found partially stable to digestion in vitro.



Patatin was identified as a major cross-reactive protein in latex-associated potato allergy and appears to be relevant for atopic dermatitis. Therefore, patatin could be a suitable marker for the determination of potato sensitization, and it may also constitute an important food allergen. Cross-reactivity between Hev b 7 and patatin was restricted to primarily latex-sensitized adults, suggesting a different mechanism of sensitization in children with atopic dermatitis.
Schmidt
Mirko H H
MHH
Research Institute for Occupational Medicine of the Berufsgenossenschaften, Ruhr University, Department of Allergology/Immunology, Bochum, Germany. nsmis@neuro.hfh.edu
Raulf-Heimsoth
Monika
M
Posch
Anton
A
D000293:Adolescent; D000328:Adult; D000485:Allergens / Q000276:immunology* / Q000302:isolation & purification; D000918:Antibody Specificity; D052179:Antigens, Plant; D002265:Carboxylic Ester Hydrolases / Q000276:immunology* / Q000302:isolation & purification; D002648:Child; D002675:Child, Preschool; D003429:Cross Reactions; D003876:Dermatitis, Atopic / Q000209:etiology / Q000276:immunology; D000939:Epitopes / Q000276:immunology; D005260:Female; D005512:Food Hypersensitivity / Q000209:etiology* / Q000276:immunology; D005638:Fruit / Q000009:adverse effects; D006282:Health Personnel; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology*; D020315:Latex Hypersensitivity / Q000209:etiology* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000209:etiology* / Q000276:immunology; D010940:Plant Proteins / Q000276:immunology* / Q000302:isolation & purification; D017386:Sequence Homology, Amino Acid; D012882:Skin Tests; D011198:Solanum tuberosum / Q000009:adverse effects* / Q000276:immunology
D000485:Allergens; D052179:Antigens, Plant; D000939:Epitopes; D010940:Plant Proteins; C113002:allergen Hev b 7; C043222:patatin protein, Solanum tuberosum; D007073:Immunoglobulin E; D002265:Carboxylic Ester Hydrolases