Association of end-product adducts with increased IgE binding of roasted peanuts.
Recently, we have shown that roasted peanuts have a higher level of IgE binding (i.e., potentially more allergenic) than raw peanuts. We hypothesized that this increase in IgE binding of roasted peanuts is due to an increased levels of protein-bound end products or adducts such as advanced glycation end products (AGE), N-(carboxymethyl)lysine (CML), malondialdehyde (MDA), and 4-hydroxynonenal (HNE). To support our hypothesis, we produced polyclonal antibodies (IgG) to each of these adducts, determined their levels in raw and roasted peanuts, and examined their ability to bind to IgE from a pooled serum of patients with clinically important peanut allergy. Results showed that AGE, CML, MDA, and HNE adducts were all present in raw and roasted peanuts. Roasted peanuts exhibited a higher level of AGE and MDA adducts than raw peanuts. IgE was partially inhibited in a competitive ELISA by antibodies to AGE but not by antibodies to CML, MDA, or HNE. This indicates that IgE has an affinity for peanut AGE adducts. Roasted peanuts exhibited a higher level of IgE binding, which was correlated with a higher level of AGE adducts. We concluded that there is an association between AGE adducts and increased IgE binding (i.e., allergenicity) of roasted peanuts.
Chung
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United States Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, USA. sychung@srrc.ars.usda.gov
Champagne
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D000485:Allergens / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism; D010367:Arachis / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism; D003296:Cooking / Q000379:methods; D004797:Enzyme-Linked Immunosorbent Assay; D005512:Food Hypersensitivity / Q000209:etiology; D006801:Humans; D007073:Immunoglobulin E / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D015416:Maillard Reaction; D010940:Plant Proteins / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism
D000485:Allergens; D007074:Immunoglobulin G; D010940:Plant Proteins; D007073:Immunoglobulin E