钟鸣 (2025-07-31 17:18):
#paper doi:10.1073/pnas.2426211122 A multifunctional anti-O-Antigen human monoclonal antibody protects against Shigella sonnei infection in vivo 这是篇发表在PNAS上的微生物学论文,核心成就是开发了一株针对志贺菌的人源单抗。作者通过流式直接从受控感染志贺菌的志愿者血液中分离到了3万多个B细胞,诱导分泌抗体后使用ELISA和L-SBA筛选到了2个具有体外杀菌活性的抗体,并进行定向改造:Hexa1突变增强效应功能;LS突变延长半衰期。作者从体内、体外、机制3个角度研究了该抗体的有效性,体内实验用了小鼠败血症模型、小鼠肺炎模型;体外实验使用了肠道芯片、实时活菌成像技术、细胞入侵实验;机制分析用了STD-NMR表位定位、活菌成像技术。本文的选题及成果现实性和实用性很强,也比较全面严谨。
A multifunctional anti-O-Antigen human monoclonal antibody protects against Shigella sonnei infection in vivo
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Abstract:
Shigellosis is a global public health challenge that mostly affects low- and middle-income countries and causes considerable morbidity and mortality among children under 5 y of age. Multi- and extensively drug-resistant Shigella sonnei strains associated with recent outbreaks in high-income countries exacerbate the problem and have prompted the World Health Organization to include Shigella spp. among the high-risk pathogens for which novel prophylactic and therapeutic tools are urgently needed. Among the most promising and cutting-edge solutions, monoclonal antibodies are gaining considerable attention in the infectious diseases field. Here, we report the discovery of human monoclonal antibodies against S. sonnei , a species whose prevalence is constantly increasing worldwide and is associated with frequent drug-resistant infections. We isolated antibodies generated in response to an experimental S. sonnei vaccine followed by a controlled human infection and screened them by using a panel of high-throughput assays. We identified a molecule which exhibited potent bactericidal activity in vitro, inhibition of invasion of epithelial cells and conferred full protection from S. sonnei infection in vivo. Overall, our study provides a candidate antibody that can rapidly progress to industrial development for application as a prophylactic, therapeutic, and diagnostic tool against shigellosis.
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