在淋巴瘤中控制瘤信号的多蛋白超级复合体
James D Phelan1, Ryan M Young1, Daniel E Webster1
1Lymphoid Malignancies Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
Nature
|June 22, 2018
概括
一个新发现的My-T-BCR超级复合体驱动瘤性B细胞受体 (BCR) 在扩散性大B细胞淋巴瘤 (DLBCL) 中发出信号. 这种超级复杂性解释了对ibrutinib的反应,并指导DLBCL亚型的向治疗.
科学领域:
- 癌症学
- 分子生物学
- 免疫学
背景情况:
- B细胞受体 (BCR) 信号传递是B细胞淋巴瘤的治疗点,但其抑制仅对分散型大B细胞淋巴瘤 (DLBCL) 患者的一小部分有益.
- 活化B细胞类 (ABC) DLBCL亚型表现不佳,依赖于BCR信号进行NF-κB激活.
- 在ABC DLBCL中,CD79A,CD79B和MYD88的突变很常见,其中MYD88 (L265P) 是普遍存在的.
研究的目的:
- 确定DLBCL中BTK抑制剂易布鲁替尼异常临床反应的分子基础.
- 阐明CD79B和MYD88突变之间促进BCR信号依赖的合作.
- 为分子定义的DLBCL子集确定新的治疗策略.
主要方法:
- 全基因组CRISPR-Cas9查
- 功能蛋白质组学
- 细胞系和患者活检的分析
- 用mTOR对内分泌体进行同位化研究
主要成果:
- 在易布鲁替尼响应DLBCL中发现了涉及MYD88,TLR9和BCR的多蛋白超复合体 (My-T-BCR).
- My-T-BCR超级复合体与mTOR在内分泌体上同定位,驱动支持生存的NF-κB和mTOR信号.
- 联合抑制BCR和mTOR信号,协同减少了My-T-BCR超复合体的形成和功能.
- My- T- BCR 超级复合体的特征是对ibrutinib反应的DLBCL,并将响应者与不响应者区分开来.
结论:
- My-T-BCR超级复合体代表了DLBCL中瘤性BCR信号的新模式.
- 这种超级复合物为结合BCR和mTOR抑制剂的协同毒性提供了机械洞察力.
- My-T-BCR超级复合体作为ibrutinib反应的生物标志物,并指导特定DLBCL子集的合理药物设计.
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