Blood:弥漫性大B细胞淋巴瘤的tonic BCR信号通路。

2017-06-24 qinqiyun MedSci原创

生发中心亚型(GCB)是具有生发中心B细胞基因表达的DLBCL的一个独特的亚型,其通过CD79A、Y188来利用tonic BCR信号通路。PTEN蛋白表达和BCR密度决定了tonic BCR信号通路对GCB-DLBCL中AKT活性的影响。

弥漫性大B细胞淋巴瘤(DLBCL)是一种最常见的非霍奇金淋巴瘤,大约占30-40%,好发于中老年人。

CRISPR/Case9是细菌和古细菌在长期演化过程中形成的一种适应性免疫防御。CRISPR/Case9技术可用于在细胞系中进行基因敲除,后发展为可用于定点构建基因敲除实验鼠模型。

近期《Blood》发表了一篇关于利用CRISPR/Case9技术来探索在弥漫性大B细胞淋巴瘤(DLBCL)细胞系中的B细胞受体(BCR)信号通路的文章。

生发中心亚型(GCB)是具有生发中心B细胞基因表达的DLBCL的一个独特的亚型,其通过CD79A、Y188来利用tonic BCR信号通路。PTEN蛋白表达和BCR密度决定了tonic BCR信号通路对GCB-DLBCL中AKT活性的影响。

用三种方法改变了BCR基因,但未影响细胞表面BCR的水平,表明BCR信号在B细胞生发中心(GCB)中对依鲁替尼所介导的BTK抑制不敏感的亚型和活化的B细胞(ABC)之间是不同的。改变BCR的抗原结合区域对GCB内的DLBCL细胞系的BCR信号没有影响,表明该细胞亚型是利用tonic BCR信号通路。相反的,在CD79A的免疫受体酪氨酸相关激活性基序的Y188F突变会抑制GCB-DLBCL细胞系的tonic BCR信号通路,但不影响BCR交联后的Ca2+流动,或者其他方式介导的ABC-DLBCL细胞系的增殖。CD79A-GEP结合表现为BCR聚集或弥散性分布,而在ABC和GCB亚型中相反。Tonic BCR信号通路主要是激活AKT,来保护敲除BCR或tonic BCR信号通路的两个中间分子(SYK和CD19)的GCB-DLBCL细胞系。通过敲除BCR后的效应可以发现,tonic BCR信号通路对GCB-DLBCL细胞系的增殖和大小的重要性是高度可变的;与之相反,敲除pan-AKT均是有害的。造成这一差异的原因是,敲除BCR会导致AKT活化改变,而AKT活化与细胞增殖和细胞表面的BCR密度相关。此外,PTEN蛋白表达和细胞表面的BCR密度会影响临床上抑制DLBCL的tonic BCR信号通路的治疗效果。

原始出处:
Ondrej Havranek,Jingda Xu,Stefan Kohrer,et al.Tonic B-cell receptor signaling in diffuse large B-cell lymphoma.Blood 2017. https://doi.org/10.1182/blood-2016-10-747303 .

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