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Rational design of low immunogenic anti CD25 recombinant immunotoxin for T cell malignancies by elimination of T cell epitopes in PE38

机译:PE38中T细胞表位消除T细胞恶性肿瘤性抗CD25重组免疫毒素的理性设计

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摘要

LMB-2, is a potent recombinant immunotoxin (RIT) that is composed of scFv antibody that targets CD25 (Tac) and a toxin fragment (PE38). It is used to treat T cell leukemias and lymphomas. To make LMB-2 less immunogenic, we introduced a large deletion in domain II and six point mutations in domain III that were previously shown to reduce T cell activation in other RITs. We found that unlike other RITs, deletion of domain II from LMB-2 severely compromised its activity. Rather than deletion, we identified T cell epitopes in domain II and used alanine substitutions to identify point mutations that diminished those epitopes. The novel RIT, LMB-142 contains a 38 kDa toxin and nine point mutations that diminished T cell response to the corresponding peptides by an average of 75%. LMB-142 has good cytotoxic activity and has lower nonspecific toxicity in mice. LMB-142 should be more efficient in cancer therapy because more treatment cycles can be given. Published by Elsevier Inc.
机译:LMB-2是一种有效的重组免疫毒素(RIT),其由靶向CD25(TAC)和毒素片段(PE38)的SCFV抗体组成。 它用于治疗T细胞白血病和淋巴瘤。 为了使LMB-2免疫原性较少,我们在域II中引入了大量缺失,并且在域III中六点突变预先显示,以降低其他速率的T细胞活化。 我们发现,与其他速率不同,从LMB-2删除域II严重影响其活动。 我们鉴定了结构域II中的T细胞表位并使用丙氨酸取代来鉴定减少这些表位的点突变。 新的Rit,LMB-142含有38kDa毒素和九点突变,将T细胞对应于相应肽的响应减少,平均值为75%。 LMB-142具有良好的细胞毒性活性,并在小鼠中具有较低的非特异性毒性。 LMB-142应在癌症治疗中更有效,因为可以给出更多的治疗循环。 elsevier公司发布

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