School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, China.
National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
Hum Vaccin Immunother. 2024 Dec 31;20(1):2299607. doi: 10.1080/21645515.2023.2299607. Epub 2024 Jan 23.
Tuberculosis (TB) caused by (Mtb) persistently kills nearly 1.5 million lives per year in the world, whereas the only licensed TB vaccine BCG exhibits unsatisfactory efficacy in adults. Taking BCG as a vehicle to express Mtb antigens is a promising way to enhance its efficacy against Mtb infection. In this study, the immune efficacy of recombination BCG (rBCG-ECD003) expressing specific antigens ESAT-6, CFP-10, and nDnaK was evaluated at different time points after immunizing BALB/c mice. The results revealed that rBCG-ECD003 induced multiple Th1 cytokine secretion including IFN-γ, TNF-α, IL-2, and IL-12 when compared to the parental BCG. Under the action of PPD or ECD003, rBCG-ECD003 immunization resulted in a significant increase in the proportion of IL-2 and IFN-γIL-2 CD4T cells. Importantly, rBCG-ECD003 induced a stronger long-term humoral immune response without compromising the safety of the parental BCG vaccine. By means of the protective efficacy assay , rBCG-ECD003 showed a greater capacity to inhibit Mtb growth in the long term. Collectively, these features of rBCG-ECD003 indicate long-term protection and the promising effect of controlling Mtb infection.
结核病(TB)每年在全球造成近 150 万人死亡,而唯一获得许可的结核疫苗卡介苗(BCG)在成人中的疗效并不理想。以 BCG 作为载体表达结核分枝杆菌抗原是提高其对结核分枝杆菌感染疗效的一种有前途的方法。在这项研究中,在免疫 BALB/c 小鼠后的不同时间点评估了表达特定抗原 ESAT-6、CFP-10 和 nDnaK 的重组 BCG(rBCG-ECD003)的免疫效果。结果表明,与亲本 BCG 相比,rBCG-ECD003 诱导了多种 Th1 细胞因子的分泌,包括 IFN-γ、TNF-α、IL-2 和 IL-12。在 PPD 或 ECD003 的作用下,rBCG-ECD003 免疫导致 IL-2 和 IFN-γIL-2 CD4T 细胞的比例显著增加。重要的是,rBCG-ECD003 诱导了更强的长期体液免疫应答,而不会损害亲本 BCG 疫苗的安全性。通过保护效力测定,rBCG-ECD003 显示出在长期内抑制结核分枝杆菌生长的更大能力。总之,rBCG-ECD003 的这些特征表明了长期保护和控制结核分枝杆菌感染的有希望的效果。
Hum Vaccin Immunother. 2024-12-31
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