微泡
化学
外体
免疫磁选
分离(微生物学)
磁性纳米粒子
化学发光
药物输送
细胞培养
分子生物学
色谱法
计算生物学
细胞生物学
纳米颗粒
纳米技术
生物化学
小RNA
生物信息学
生物
基因
有机化学
材料科学
遗传学
作者
Xiaoniu Guo,Fei Hu,Shuhao Zhao,Yong Zhang,Zengming Zhang,Niancai Peng
标识
DOI:10.1021/acs.analchem.2c03470
摘要
Exosomes are important participants in numerous pathophysiological processes and hold promising application value in cancer diagnosis, monitoring, and prognosis. However, the small size (40–160 nm) and high heterogeneity of exosomes make it still challenging to enrich exosomes efficiently from the complex biological fluid microenvironment, which has largely restricted their downstream analysis and clinical application. In this work, we introduced a novel method for rapid isolation and mild release of exosomes from the cell culture supernatant. A Strep-tag II-based immunomagnetic isolation (SIMI) system was constructed by modifying the capture antibodies onto magnetic nanoparticles through specific and reversible recognition between Strep-Tactin and Strep-tag II. Due to their high affinity and binding selectivity, exosomes could be isolated within 38 min with an isolation efficiency of 82.5% and a release efficiency of 62%. Compared with the gold-standard ultracentrifugation, the SIMI system could harvest nearly 59% more exosomes from the 293 T cell culture medium with shorter isolation time and higher purity. In addition, cellular uptake assay indicated that exosomes released from magnetic nanoparticles could maintain their high biological activity. These superior characteristics show that this novel method is a fast, efficient, and nondestructive exosome isolation tool and thus could potentially be further utilized in various exosome-related applications, e.g., disease diagnosis and drug delivery.
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