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Blood:Sos1缺陷可缓解致瘤性Kras[G12D]所诱导的骨髓增生性肿瘤

2018-11-02 MedSci MedSci原创

中心点:Sos1介导致瘤性Kras诱导的野生型Nras和Hras超活化。Sos1-/-可减弱Kras[G12D]诱导型MPN,延长Kras[G12D]小鼠的存活期。摘要:研究人员既往发现Kras[G12D]在血液恶性肿瘤中的致癌性比Nras的更强。Xiaona You等研究人员认为Kras[G12D]具有很强的白细胞生成活性,至少部分原因是在于其独特的超激活野生型(WT)Nras和Hras的能力。

中心点:

Sos1介导致瘤性Kras诱导的野生型Nras和Hras超活化。

Sos1-/-可减弱Kras[G12D]诱导型MPN,延长Kras[G12D]小鼠的存活期。

摘要:

研究人员既往发现Kras[G12D]血液恶性肿瘤中的致癌性比Nras的更强。Xiaona You等研究人员认为Kras[G12D]具有很强的白细胞生成活性,至少部分原因是在于其独特的超激活野生型(WT)Nras和Hras的能力。现其发现Sos1,鸟嘌呤核苷酸交换因子,参与调控该过程。Sos1在Kras[G12D/+]细胞中过表达,但在Nras[Q61R/+]细胞中无相似情况。在体内,Kras[G12D]蛋白与Sos1形成复合物。在Kras[G12D]细胞中,Sos1缺陷可缓解WT Nras、Hras及其下游ERK信号的超活化。

因此,敲除Sos1可改善致瘤性Kras诱导的骨髓增生性肿瘤(MPN)表型,延长Kras[G12D]小鼠的存活期。相反,在Nras[Q61R/+]细胞中,Sos1对于超激活GM-CSF信号可有可无,敲除Sos1并不影响Nras[Q61R/+]小鼠的MPN表型。

此外,Kras[G12D/+];Sos1-/-小鼠的存活期与采用MEK+JAK抑制剂联合治疗的Kras[G12D/+]小鼠的存活期相差无几。

综上所述,靶向Sos1与致瘤性Kras的相互作用或可提高携带KRAS突变的癌症患者的存活率。


原始出处:

Xiaona You,et al. Unique dependence on Sos1 in KrasG12D-induced leukemogenesis. Blood  2018  :blood-2018-09-874107;  doi: https://doi.org/10.1182/blood-2018-09-874107

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    2019-06-29 yibei
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    2018-11-04 yinhl1978
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    2018-11-02 天地飞扬

    了解一下,谢谢分享!

    0

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