AIM： To construct a recombinant live attenuated Salmonella typhimurium DNA vaccine encoding H pylori ureB gene and mouse IL-2 gene and to detect its immunogenicity in vitro and in vivo. METHODS： Hpylori ureB and mou...AIM： To construct a recombinant live attenuated Salmonella typhimurium DNA vaccine encoding H pylori ureB gene and mouse IL-2 gene and to detect its immunogenicity in vitro and in vivo. METHODS： Hpylori ureB and mouse IL-2 gene fragments were amplified by polymerase chain reaction （PCR） and cloned into pUCmT vector. DNA sequence of the amplified ureB and IL-2 genes was assayed, then cloned into the eukaryotic expression vector pIRES through enzyme digestion and ligation reactions resulting in pIRES-ureB and pIRES-ureB-IL-2. The recombinant plasmids were used to transform competent E. co/i DH5α, and the positive clones were screened by PCR and restriction enzyme digestion. Then, the recombinant pIRES-ureB and pIRES-ureB-IL-2 were used to transform LB5000 and the recombinant plasmids extracted from LB5000 were finally introduced into the final host SL7207. After that, recombinant strains were grown in vitro repeatedly. In order to detect the immunogenicib/of the vaccine in vitro, pIRES-ureB and pIRES-ureB-IL-2 were transfected to COS-7 cells using LipofectamineTM2000, the immunogenicity of expressed UreB and IL-2 proteins was assayed with SDS-PAGE and Western blot. C57BL/6 mice were orally immunized with 1 × 10^8 recombinant attenuated Salmonella typhimurium DNA vaccine. Four weeks after vaccination, mice were challenged with 1 × 10^7 CFU of live Hpylori SS1. Mice were sacrificed and the stomach was isolated for examination of H pylon 4 wk post-challenge. RESULTS： The 1700 base pair ureB gene fragment amplified from the genomic DNA was consistent with the sequence of H pylori ureB by sequence analysis. The amplified 510 base pair fragment was consistent with the sequence of mouse IL-2 in gene bank. It was confirmed by PCR and restriction enzyme digestion that H pylori ureB and mouse IL-2 genes were inserted into the eukaryotic expression vector pIRES. The experiments in vitro showed that stable recombinant live attenuated Salmonella typhimurium DNA vaccine carrying ureB and IL-2 genes was successfully 展开更多
报告1例新生儿期确诊X-连锁重症联合免疫缺陷病(X-linked severe combined immunodeficiency,X-SCID)的患儿,以淋巴细胞计数持续减低、反复感染为主要表现,淋巴细胞亚群示T细胞、自然杀伤性细胞减少,胸部X线片未见胸腺影,家系全外显子...报告1例新生儿期确诊X-连锁重症联合免疫缺陷病(X-linked severe combined immunodeficiency,X-SCID)的患儿,以淋巴细胞计数持续减低、反复感染为主要表现,淋巴细胞亚群示T细胞、自然杀伤性细胞减少,胸部X线片未见胸腺影,家系全外显子组测序确诊为IL2RG基因变异所致的X-SCID。生后5月龄行骨髓移植治疗,现11月龄,淋巴细胞计数正常,未再发生感染,预后良好。展开更多
基金the National Natural Science Foundation of China, No. 30170427
文摘AIM： To construct a recombinant live attenuated Salmonella typhimurium DNA vaccine encoding H pylori ureB gene and mouse IL-2 gene and to detect its immunogenicity in vitro and in vivo. METHODS： Hpylori ureB and mouse IL-2 gene fragments were amplified by polymerase chain reaction （PCR） and cloned into pUCmT vector. DNA sequence of the amplified ureB and IL-2 genes was assayed, then cloned into the eukaryotic expression vector pIRES through enzyme digestion and ligation reactions resulting in pIRES-ureB and pIRES-ureB-IL-2. The recombinant plasmids were used to transform competent E. co/i DH5α, and the positive clones were screened by PCR and restriction enzyme digestion. Then, the recombinant pIRES-ureB and pIRES-ureB-IL-2 were used to transform LB5000 and the recombinant plasmids extracted from LB5000 were finally introduced into the final host SL7207. After that, recombinant strains were grown in vitro repeatedly. In order to detect the immunogenicib/of the vaccine in vitro, pIRES-ureB and pIRES-ureB-IL-2 were transfected to COS-7 cells using LipofectamineTM2000, the immunogenicity of expressed UreB and IL-2 proteins was assayed with SDS-PAGE and Western blot. C57BL/6 mice were orally immunized with 1 × 10^8 recombinant attenuated Salmonella typhimurium DNA vaccine. Four weeks after vaccination, mice were challenged with 1 × 10^7 CFU of live Hpylori SS1. Mice were sacrificed and the stomach was isolated for examination of H pylon 4 wk post-challenge. RESULTS： The 1700 base pair ureB gene fragment amplified from the genomic DNA was consistent with the sequence of H pylori ureB by sequence analysis. The amplified 510 base pair fragment was consistent with the sequence of mouse IL-2 in gene bank. It was confirmed by PCR and restriction enzyme digestion that H pylori ureB and mouse IL-2 genes were inserted into the eukaryotic expression vector pIRES. The experiments in vitro showed that stable recombinant live attenuated Salmonella typhimurium DNA vaccine carrying ureB and IL-2 genes was successfully
文摘报告1例新生儿期确诊X-连锁重症联合免疫缺陷病(X-linked severe combined immunodeficiency,X-SCID)的患儿,以淋巴细胞计数持续减低、反复感染为主要表现,淋巴细胞亚群示T细胞、自然杀伤性细胞减少,胸部X线片未见胸腺影,家系全外显子组测序确诊为IL2RG基因变异所致的X-SCID。生后5月龄行骨髓移植治疗,现11月龄,淋巴细胞计数正常,未再发生感染,预后良好。
