Immunization and/or treatment of parasites and infectious agents by live bacteria
申请人:Bermudes David Gordon
公开号:US10364435B1
公开(公告)日:2019-07-30
Chimeric proteins are expressed, secreted or released by a bacterium to immunize against or treat a parasite, infectious disease or malignancy. The delivery vector may also be attenuated, non-pathogenic, low pathogenic, or a probiotic bacterium. The chimeric proteins include chimeras of, e.g., phage coat and/or colicin proteins, bacterial toxins and/or enzymes, autotransporter peptides, lytic peptides, multimerization domains, and/or membrane transducing (ferry) peptides. The active portion of the immunogenic chimeric proteins can include antigens against a wide range of parasites and infectious agents, cancers, Alzheimer's and Huntington's diseases, and have enhanced activity when secreted or released by the bacteria, and/or have direct anti-parasite or infectious agent activity. The activity of the secreted proteins is further increased by co-expression of a protease inhibitor that prevents degradation of the effector peptides. Addition of an antibody binding or antibody-degrading protein further prevents the premature elimination of the vector and enhances the immune response.
嵌合蛋白由细菌表达、分泌或释放,用于免疫或治疗寄生虫、传染病或恶性肿瘤。递送载体也可以是减毒菌、非致病菌、低致病菌或益生菌。嵌合蛋白包括噬菌体衣壳蛋白和/或肠毒素蛋白、细菌毒素和/或酶、自转运肽、溶解肽、多聚化结构域和/或膜转运(渡)肽等的嵌合体。免疫原性嵌合蛋白的活性部分可包括抗多种寄生虫和传染病病原体、癌症、阿尔茨海默氏症和亨廷顿氏症的抗原,当细菌分泌或释放时活性增强,和/或具有直接抗寄生虫或传染病病原体的活性。同时表达蛋白酶抑制剂可防止效应肽降解,从而进一步提高分泌蛋白的活性。加入抗体结合蛋白或抗体降解蛋白可进一步防止载体过早消亡,并增强免疫反应。