In this study, the immuno-response of recombinant hCG-β and natural hCGβ was comparatively investigated by using Freund's adjuvant. The results showed that, the properties and merits of the antibodies elicited b...In this study, the immuno-response of recombinant hCG-β and natural hCGβ was comparatively investigated by using Freund's adjuvant. The results showed that, the properties and merits of the antibodies elicited by both kinds of hCG-β were similar. The antisera had high affinity for binding with hCG (Kαγβ≈5.86×108/mol/L, Kαβ≈8.18×108/mol/L), and were found to be effective in inhibiting the binding of 125I-hCG to receptors in rat testes. Results also indicated that, similar to the antisera induced by natural hCG-β, the recombinant hCG-β induced antisera had capacity of neutralizing the biological activities of hCG. Recombinant hCG-β could be used as an immunogen for contraceptive vaccine.展开更多
目的 :探索乳酸杆菌携带表达 h CGβ避孕疫苗的抗生育作用。方法 :用 PCR从短小乳酸杆菌染色体中扩增得到 S-层蛋白的信号肽序列 ,将其与 h CGβ基因连接后克隆到乳酸杆菌整合型表达载体 p Ilac的 lac启动子下游 ,得到质粒 p Ilac h CG...目的 :探索乳酸杆菌携带表达 h CGβ避孕疫苗的抗生育作用。方法 :用 PCR从短小乳酸杆菌染色体中扩增得到 S-层蛋白的信号肽序列 ,将其与 h CGβ基因连接后克隆到乳酸杆菌整合型表达载体 p Ilac的 lac启动子下游 ,得到质粒 p Ilac h CGβ,电穿孔转化干酪氏乳酸杆菌 Lb. caseiCECT5 2 76。挑选转化后的耐药菌落 ,在含红霉素培养基中培养 ,抽提其染色体 DNA,PCR及测序鉴定证实 h CGβ基因整合到 Lb.casei的基因组中。h CG放免检测上清及细胞裂解液中的 h CGβ。结果 :h CGβ基因已经整合到 Lb.casei的基因组中 ;细菌产生的目的蛋白约有 3/ 4分泌进入培养上清 ,而加入诱导剂乳糖 2 1 h后 ,上清中的蛋白浓度达到峰值 ,为 440 m IU/ m L。重组菌在无选择压力条件下培养 5 0代后仍可分泌 h CGβ。结论 :h CGβ在乳酸杆菌中得到了稳定的。展开更多
文摘In this study, the immuno-response of recombinant hCG-β and natural hCGβ was comparatively investigated by using Freund's adjuvant. The results showed that, the properties and merits of the antibodies elicited by both kinds of hCG-β were similar. The antisera had high affinity for binding with hCG (Kαγβ≈5.86×108/mol/L, Kαβ≈8.18×108/mol/L), and were found to be effective in inhibiting the binding of 125I-hCG to receptors in rat testes. Results also indicated that, similar to the antisera induced by natural hCG-β, the recombinant hCG-β induced antisera had capacity of neutralizing the biological activities of hCG. Recombinant hCG-β could be used as an immunogen for contraceptive vaccine.
