Influence of Gamma Irradiation and Heat Treatment on the Immunogenicity of Five Epitopes of Pen a1
文献类型: 外文期刊
第一作者: Mou, Hui
作者: Mou, Hui;Gao, Mei-xu;Zhao, Jie;Zhao, Xin;Wang, Zhi-dong;Pan, Jia-rong
作者机构:
关键词: Pen a1;epitopes;gamma irradiation;heat;immunoreactivity
期刊名称:FOOD SCIENCE AND TECHNOLOGY RESEARCH ( 影响因子:0.668; 五年影响因子:0.895 )
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收录情况: SCI
摘要: Background: Pen a1 is a major allergen in shrimp. It is a 284 amino acid protein member of the tropomyosin family with a molecular weight of 36 kDa. Irradiation and heat treatments have been previously shown to reduce the immunoreactivity of Pen a1, but since anaphylaxis is not induced by the whole protein but by epitopes within the protein, studying of the influence of these treatments on the epitopes of Pen a1 is helpful for understanding the sensitization mechanism. In this study, the immunoreactivity of the five epitopes of Pen a1 exposed to heat and irradiation treatments was detected by Ci-ELISA and western blot, using specific anti-sera generated from 5 synthesized epitope peptides of Pen a1. We examined the function of each epitope in the sensitization process by analyzing the variations of their immunoreactivity following irradiation, heat treatment, or a combination of both. RESULTS: Pen a1 was treated by gamma irradiation, heat at 100℃ or a combination of irradiation and heat. The IC_(50) value for each of the five epitopes was detected. The IC_(50) value of epitopes 1, 2, and 4 decreased under all treatments, especially epitope 4; its IC_(50) value decreased sharply from 15.88 to 0.11 follwing 7 kGy irradiation and to 0.03 - 0.04 under 10 kGy or 7 kGy irradiation and heat. The IC_(50) value of epitope 3 increased from 1.49 to 5.32 under 7 kGy irradiation and to 10.03 under 7kGy and heat, but mildly decreased after 10 kGy irradiation. In contrast, the IC_(50) value of epitope 5 hardly changed following any treatments. CONCLUSION: The variation in the IC_(50) values of epitope 3 was consistent with the IC_(50) values measured from the whole Pen a1 protein, while epitope 5 was stable following irradiation and heat treatments. Since the variation of immunoreactivity of epitope 3 was consistent with Pen a1, this suggests that epitope 3 is the determinative epitope in the allergenicity of Pen a1; epitope 5 was stable with all treatment conditions, suggesting that it could be used in immunoassay kits for the detection of treated shrimp.
分类号: TS2
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