Yamamoto Lais Sayuri, Trentini Monalisa Martins, Rodriguez Dunia, Silveira Paulo Henrique Santana, Januzzi Arthur Daniel, Carvalho Ana Carolina de Oliveira, Leite Luciana Cezar de Cerqueira, Kanno Alex Issamu
Instituto Butantan, Laboratório de Desenvolvimento de Vacinas, São Paulo, SP, Brasil.
Universidade de São Paulo, Programa de Pós-Graduação Interunidades em Biotecnologia, São Paulo, SP, Brasil.
Mem Inst Oswaldo Cruz. 2025 Mar 3;120:e240167. doi: 10.1590/0074-02760240167. eCollection 2025.
Bacillus Calmette-Guérin (BCG) is one of the most successful vaccines in the world and evidence suggests it can be used as a bacterial vector to deliver heterologous antigens.
We evaluated whether BCG could be biotinylated and used as a carrier of Schistosoma mansoni antigen tetraspanin-2 (TSP-2) fused with rhizavidin, an avidin analog.
BCG was grown and biotinylated. The recombinant protein Rzv:TSP-2 was produced and purified from Escherichia coli. The biotinylation and antigen coupling was analysed by flow cytometry, enzyme-linked immunosorbent assay (ELISA) and Western blot. Vaccine immunogenicity was tested in immunised mice by the assessment of lung and splenic T cells.
BCG can be biotinylated, which in turn, can be coupled with Rzv:TSP-2. After a series of optimisations which involved molarity of the biotin, ratio of BCG:reagent and the concentration of Rzv:TSP-2 used, almost 50% of the bacteria were biotinylated and 35% coupled with antigen. Although a clear adjuvant effect of BCG was observed, evaluation of immune response in immunised mice demonstrated an overall low immunogenicity of the BCG-Rzv:TSP-2.
These results demonstrated the use of BCG as a carrier of avidin-tagged antigens. Further optimisations are needed in order to strengthen the stability of tagged proteins in order to produce antigen-specific immune responses.
卡介苗(BCG)是世界上最成功的疫苗之一,有证据表明它可作为一种细菌载体来递送异源抗原。
我们评估了卡介苗是否可以生物素化,并用作与抗生物素蛋白类似物根抗生物素蛋白融合的曼氏血吸虫抗原四跨膜蛋白-2(TSP-2)的载体。
培养并生物素化卡介苗。从大肠杆菌中生产并纯化重组蛋白Rzv:TSP-2。通过流式细胞术、酶联免疫吸附测定(ELISA)和蛋白质印迹法分析生物素化和抗原偶联情况。通过评估肺和脾中的T细胞,在免疫小鼠中测试疫苗的免疫原性。
卡介苗可以生物素化,进而可与Rzv:TSP-2偶联。经过一系列优化,包括生物素的摩尔浓度、卡介苗与试剂的比例以及所用Rzv:TSP-2的浓度,几乎50%的细菌被生物素化,35%与抗原偶联。尽管观察到卡介苗有明显的佐剂作用,但对免疫小鼠免疫反应的评估表明,卡介苗-Rzv:TSP-2的总体免疫原性较低。
这些结果证明了卡介苗可作为抗生物素蛋白标记抗原的载体。为了增强标记蛋白的稳定性以产生抗原特异性免疫反应,还需要进一步优化。