Biomaterials:通过Cas9/sgRNA编辑制备DNA适体免疫检查点

2019-07-28 不详 网络

免疫检查点抑制剂已在免疫疗法中广泛研究。尽管抗体已被更广泛地用于阻断免疫检查点,但DNA适体具有用于此目的的独特优势。在这里,我们设计了一种DNA多聚体水凝胶,可以通过Cas9/sgRNA精确切割,用于编程释放免疫检查点-阻断DNA适体。作为代表性免疫检查点抑制剂,我们使用PD-1 DNA适体。使用滚环扩增产生包含具有PD-1适体和sgRNA靶向序列的DNA的水凝胶。当与Cas9/sgRNA混合时

免疫检查点抑制剂已在免疫疗法中广泛研究。尽管抗体已被更广泛地用于阻断免疫检查点,但DNA适体具有用于此目的的独特优势。在这里,我们设计了一种DNA多聚体水凝胶,可以通过Cas9/sgRNA精确切割,用于编程释放免疫检查点-阻断DNA适体。

作为代表性免疫检查点抑制剂,我们使用PD-1 DNA适体。使用滚环扩增产生包含具有PD-1适体和sgRNA靶向序列的DNA的水凝胶。当与Cas9/sgRNA混合时,PD-1 DNA适体水凝胶(PAH)失去其凝胶特性并释放PD-1适体序列。凝胶电泳证实,精确的Cas9/sgRNA介导的PD-1 DNA适体的释放可有效激活脾细胞的细胞因子分泌功能。在体内,分子成像显示,与Cas9/sgRNA(Cas9/PAH)共注射的PD-1 DNA多聚体水凝胶在游离部位保留的时间长于游离适体,并且比水凝胶或游离适体产生显着更高的抗肿瘤效果和存活率。此外,在用Cas9/PAH处理的肿瘤组织中观察到增加的免疫细胞过滤。

总之,这些结果表明,我们的Cas9/sgRNA编辑的免疫检查点阻断适体水凝胶具有很强的抗癌免疫治疗潜力。

原始出处:

Lee J, Le QV, et al., Cas9-edited immune checkpoint blockade PD-1 DNA polyaptamer hydrogel for cancer immunotherapy. Biomaterials. 2019 Jul 15;218:119359. doi: 10.1016/j.biomaterials.2019.119359.

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    2020-01-27 sunylz
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    2019-07-30 respect
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    2019-07-30 yaanren
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    2019-07-28 天地飞扬

    学习

    0