Blood:CBL突变通过强化LYN与PIK3R1相互作用驱动PI3K/AKT信号

2021-01-08 MedSci原创 MedSci原创

无偏移磷酸化蛋白质组学和相关作用组学突显了LYN激酶在突变型CBL蛋白致癌功能中的关键作用;LYN过度激活可加强CBL突变型细胞系和患者来源CMML细胞对达沙替尼的敏感性。

CBL编码E3泛素连接酶和信号转导接头,可调节受体和非受体酪氨酸激酶。复发性CBL突变可选择地破坏蛋白质的E3泛素连接酶活性,发生于髓系肿瘤,包括10-20%的慢性粒细胞单核细胞白血病(CMML)。CBL突变与患者不良预后有关,但是CBL突变的致癌机制和对治疗的意义尚不完全清楚。

Belizaire等结合功能检测和整体质谱来定义一组表达等位基因的CBL突变的细胞系中的磷酸化蛋白质组、CBL相互作用组和信号激活机制。

CBL功能获得性突变与白介素敏感性和LYN与PI3K/ AKT激活增强相关

LYN促进CBL-PIK3R1互作、增强CBL突变细胞的增殖

该研究分析表明,LYN激活增强和与突变型CBL的相互作用都是CBL突变细胞中CBL磷酸化增强、PIK3R1募集和下游PI3K/ AKT信号传导的关键驱动力。CBL的信号衔接子结构域,包括酪氨酸激酶结合结构域,脯氨酸富集区域和C末端磷酸酪氨酸位点,均是CBL突变发挥致癌功能所必需的。

达沙替尼可抑制CBL突变细胞的增殖、CBL磷酸化、PI3K/ AKT信号及CBL-PIK3R1互作

遗传消融和达沙替尼(dasatinib)介导的LYN抑制可减少CBL磷酸化、CBL-PIK3R1相互作用和PI3K/AKT信号。此外,研究人员还证实,无论是在体内还是体外,达沙替尼对CBL突变细胞系和原发CMML都具有抗增殖活性

综上所述,该研究对CBL突变分子功能机制的解析为探索LYN抑制在CBL突变型髓样恶性肿瘤中的治疗潜力提供了理论依据

原始出处:

Roger Belizaire, et al. CBL mutations drive PI3K/AKT signaling via increased interaction with LYN and PIK3R1. Blood. January 07, 2020.

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    2021-12-01 xfpan20
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    2021-08-03 lidong40
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    2021-01-10 ylz8405
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