抗须癣毛癣菌细胞壁蛋白的卵黄抗体制备和鉴定

Preparation and identification of specific chicken egg yolk immunoglobulins against cell wall protein of Trichophyton mentagrophytes

目的:提取须癣毛癣菌的细胞壁蛋白作为免疫原制备特异性卵黄抗体,并鉴定其生物活性,为卵黄抗体在预防与治疗皮肤癣疾病的应用奠定基础。方法:本研究采用冷碱抽提的方法提取须癣毛癣菌的细胞壁蛋白,并用其免疫健康的产蛋母鸡。采用聚乙二醇两步沉淀法及饱和硫酸铵盐析提纯卵黄抗体;用Bradford法检测卵黄抗体中蛋白含量;SDS-PAGE凝胶电泳分析测定卵黄抗体的纯度以及相对分子质量;ELISA检测纯化的卵黄抗体的效价;Western blot分析特异性卵黄抗体的免疫反应性。结果:提取的卵黄抗体中蛋白纯度达到87.27%。由细胞壁蛋白制备的特异性卵黄抗体在初免20 d后效价开始升高,到45天达到最高值(1∶32 000)。Western blot结果显示由细胞壁蛋白制备的卵黄抗体能与其良好的特异性结合,具有较好的免疫反应性。结论:本实验提取的须癣毛癣菌细胞壁蛋白作为免疫原可以制备出特异性较强的卵黄抗体,为须癣毛癣菌感染的皮肤疾病提供了治疗新思路。

Objective Prepared the specific chicken egg yolk immunoglobulins （IgY） against the cell wall protein of Trichophyton mentagrophytes （tmCWP） and detected its biological activities,which was to establish the basis for the preventment and treatment in dermatophytes disease. Methods： In this work, tmCWP was extracted and purified by cold alkali method, and being used as immunogen to immunized healthy laying hens. The IgY was extracted from the egg yolk by polyethylene glycol method and purified by saturated ammonium sulfate method, respectively. The concentration of the extracted IgY was detected by Bradford method. The purity and molecular weight of the specific anti-tmCWP IgY were analysed by SDS-PAGE. The titer of IgY was obtained by ELISA. The immu- noreactivity of IgY was performed by Western blot. Results： The purity of the extracted IgY reached to 87. 27%. ELISA indicated that the titer of the specific anti-tmCWP IgY gradual rised 20 days after primary immunization and reached to the highest value （1 ： 32 000） after 45 days. Western blot revealed that the specific IgY showed a good immunoreactivity and a specifically combination capacity. Conclusion： In our work,the tmCWP could be regarded as the immunogen to prepare the specific anti-tmCWP IgY,which could provide a novel thought for the therapy of Trichophyton mentagrophytes infection.