Attenuated Allergenic Activity of Ovomucoid After Electrolysis

Allergy Asthma Immunol Res > v.7(6); Nov 2015   Brief Communication  Open Access Jun Kido,1,2 and Tomoaki Matsumoto1,3,4 1Department of Pediatrics, Kumamoto Regional Medical Center, Kumamoto City, Kumamoto, Japan. 2Department of Pediatrics, Graduate School of Medical Sciences, Kumamoto University, Kumamoto City, Kumamoto, Japan. 3Department of Child Development, Kumamoto University Hospital, Kumamoto City, Kumamoto, Japan. 4Pediatric Division, Aso Spa Hospital, Aso City, Kumamoto, Japan. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Ovomucoid (OMC) is the most prominent allergen causing hen's egg allergy, containing disulfide (S-S) bonds that may be responsible for its allergic action. As S-S bonds may be reduced during electrolysis, this study was undertaken to evaluate modulation of the allergic action of OMC after electrolysis. Electrolysis was carried out for 1% OMC containing 1% sodium chloride for 30 minutes with a voltage difference of 90 V, 0.23 A (30 mA/cm2). Protein assays, amino acid measurement, and mass spectrometry in untreated OMC and OMC on both the anode and cathode sides after electrolysis were performed. Moreover, 21 patients with IgE-mediated hen's egg allergy were evaluated by using the skin prick test (SPT) for untreated OMC and OMC after electrolysis. The allergic action of OMC was reduced after electrolysis on both the anode and cathode sides when evaluated by the SPT. The modifications of OMC on electrolysis caused the loss of 2 distinct peptide fragments (57E-63K and 123H-128R) as seen on matrix-associated laser desorption/ionization time-of-flight mass spectrometry. The total free SH groups in OMC were increased on the cathode side. Although the regions of S-S broken bonds were not determined in this study, the change in S-S bonds in OMC on both the anode and cathode sides may reduce the allergenic activity. Formats: Citation Abstract Article PDF PubReader ePub Figures + Tables References