Poly-dl-lactide-poly(ethylene glycol) (PELA) triblock copolymers were synthesized with lanthanum acetate as the initiator. PELA microspheres with entrapped Vibrio Cholera antigen and outer membrane protein (OMP) were ...Poly-dl-lactide-poly(ethylene glycol) (PELA) triblock copolymers were synthesized with lanthanum acetate as the initiator. PELA microspheres with entrapped Vibrio Cholera antigen and outer membrane protein (OMP) were prepared by a double emulsion W/O/W based on solvent extraction methods. The obtained microspheres showed smooth and spherical surface and their size varied between 0.5 and 5.0 mu m, which are suitable for oral targeting delivery system. The distribution tests in rabbits and mice through scanning electronic micrography and fluorescence microscope indicated that microspheres have successfully reached the immunization-related tissues, such as the liver, spleen and intestinal peyer's patches, following oral administration. The PELA microspheres were also evaluated as an efficient antigen delivery system by enhancing a higher protective ratio against live Vibrios Cholera.展开更多
霍乱弧菌经过 SephadexG-200凝胶柱层析提纯得到2个细胞壁抗原,称为Ⅰ抗原和Ⅱ抗原,分子量分别为110,000 Dal 和60,000Dal。Ⅰ抗原为脂多糖成份;Ⅱ抗原主要为蛋白成份。二者无论经口服或非肠遭途径免疫家免或小鼠都能产生特异性抗体,即...霍乱弧菌经过 SephadexG-200凝胶柱层析提纯得到2个细胞壁抗原,称为Ⅰ抗原和Ⅱ抗原,分子量分别为110,000 Dal 和60,000Dal。Ⅰ抗原为脂多糖成份;Ⅱ抗原主要为蛋白成份。二者无论经口服或非肠遭途径免疫家免或小鼠都能产生特异性抗体,即其免疫血清在琼脂双扩散试验中有特异性抗原抗体沉淀线形成,杀弧菌抗体和凝集抗体的水平升高,并可使免疫动物耐受一定量霍乱弧菌或霍乱毒素的攻击。当Ⅰ、Ⅱ两抗原混台(称为Ⅰ+Ⅱ抗原),产生的免疫反应较单一种抗原更强。若将Ⅰ+Ⅱ抗原再加入霍乱毒素 B 亚单位,或加热毒素或灭活的霍乱弧菌菌体,免疫家兔或小鼠后,则三者产生的免疫反应也不相同,即在小鼠肠结扎试验中耐受肠毒素攻击的反应性不同,以Ⅰ+Ⅱ抗原加菌体保护效果最好。本研究还用免疫缺陷型裸鼠证明Ⅰ、Ⅱ抗原在体内主要依赖 B 淋巴细胞引起免疫应答,而霍乱毒素主要依赖 T 淋巴细胞引起免疫应答,这是两种不同免疫反应性抗原。展开更多
基金The project was supported by the National Natural Science Foundation of China(No.29774034).
文摘Poly-dl-lactide-poly(ethylene glycol) (PELA) triblock copolymers were synthesized with lanthanum acetate as the initiator. PELA microspheres with entrapped Vibrio Cholera antigen and outer membrane protein (OMP) were prepared by a double emulsion W/O/W based on solvent extraction methods. The obtained microspheres showed smooth and spherical surface and their size varied between 0.5 and 5.0 mu m, which are suitable for oral targeting delivery system. The distribution tests in rabbits and mice through scanning electronic micrography and fluorescence microscope indicated that microspheres have successfully reached the immunization-related tissues, such as the liver, spleen and intestinal peyer's patches, following oral administration. The PELA microspheres were also evaluated as an efficient antigen delivery system by enhancing a higher protective ratio against live Vibrios Cholera.
文摘霍乱弧菌经过 SephadexG-200凝胶柱层析提纯得到2个细胞壁抗原,称为Ⅰ抗原和Ⅱ抗原,分子量分别为110,000 Dal 和60,000Dal。Ⅰ抗原为脂多糖成份;Ⅱ抗原主要为蛋白成份。二者无论经口服或非肠遭途径免疫家免或小鼠都能产生特异性抗体,即其免疫血清在琼脂双扩散试验中有特异性抗原抗体沉淀线形成,杀弧菌抗体和凝集抗体的水平升高,并可使免疫动物耐受一定量霍乱弧菌或霍乱毒素的攻击。当Ⅰ、Ⅱ两抗原混台(称为Ⅰ+Ⅱ抗原),产生的免疫反应较单一种抗原更强。若将Ⅰ+Ⅱ抗原再加入霍乱毒素 B 亚单位,或加热毒素或灭活的霍乱弧菌菌体,免疫家兔或小鼠后,则三者产生的免疫反应也不相同,即在小鼠肠结扎试验中耐受肠毒素攻击的反应性不同,以Ⅰ+Ⅱ抗原加菌体保护效果最好。本研究还用免疫缺陷型裸鼠证明Ⅰ、Ⅱ抗原在体内主要依赖 B 淋巴细胞引起免疫应答,而霍乱毒素主要依赖 T 淋巴细胞引起免疫应答,这是两种不同免疫反应性抗原。
