Blood:hnCD16-iNK细胞的抗肿瘤活性

2019-12-22 QQY MedSci原创

抗体依赖性细胞毒性(ADCC)是由治疗性单克隆抗体(mAbs)介导的自然杀伤(NK)细胞的关键效应机制。该过程是由人NK细胞上的Fc受体CD16a促进的。CD16a可能是NK细胞上唯一被金属蛋白酶ADAM17激活的受体。研究人员既往发现CD16a的点突变可以阻断这种激活诱导的表面切割。

中心点:

人多能干细胞可为生产具有高效抗肿瘤活性的天然杀伤细胞提供了一个新的平台。

具有高亲和力、不可切割的CD16a的人iPSC-NK细胞能够使抗体更有效地靶向不同肿瘤类型的NK细胞。

摘要:

抗体依赖性细胞毒性(ADCC)是由治疗性单克隆抗体(mAbs)介导的自然杀伤(NK)细胞的关键效应机制。该过程是由人NK细胞上的Fc受体CD16a促进的。CD16a可能是NK细胞上唯一被金属蛋白酶ADAM17激活的受体。研究人员既往发现CD16a的点突变可以阻断这种激活诱导的表面切割。

现研究人员将这种不可切割的CD16a突变体修饰成高亲和力的CD16a变体(hnCD16),并进一步诱导成人类诱导多能干细胞,为hiPSC来源的NK细胞(hnCD16-iNK细胞)的衍生创造一个可再生的来源。与未修饰的iNK和外周血来源的NK(PB-NK)小细胞相比,hnCD16-iNK细胞被证实对CD16a的激活诱导性切割具有更高的耐受性。研究人员还发现hnCD16-iNK细胞功能成熟,对多种肿瘤靶点的ADCC均增强。

使用人B细胞淋巴瘤的体内异种移植研究表明,相比于用PB-NK细胞或未修饰的iNK细胞的anti-CD20 mAb治疗,采用hnCD16-iNK细胞和anti-CD20 mAb治疗B细胞淋巴瘤可显著缓解病情。hnCD16-iNK细胞联合抗Her2 mAb也可提高卵巢癌异种移植瘤模型的存活率。

总而言之,本研究表明hnCD16-iNK细胞联合单克隆抗体对血液恶性肿瘤和实体瘤都具有很高的疗效,而且特别是对于NK细胞介导的杀伤有抵抗作用的肿瘤,展示了利用ADCC特性加强的标准现成的工程NK细胞治疗难治性恶性肿瘤的可行性。

原始出处:

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    2020-11-25 yeye5224612
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