Cell Death Dis:核糖体成熟因子SBDS双重调控p53

2020-04-03 MedSci原创 MedSci原创

SBDS基因,因与Shwachman-Bodian Diamond综合征(SBDS)高度相关而得名。该综合征的主要特征为胰腺功能障碍、血液循环系统衰竭、骨骼畸形及神经系统相关表型。SBDS基因能够参与

SBDS基因,因与Shwachman-Bodian Diamond综合征(SBDS)高度相关而得名。该综合征的主要特征为胰腺功能障碍、血液循环系统衰竭、骨骼畸形及神经系统相关表型。SBDS基因能够参与rRNA的合成及核糖体的成熟,既往研究通过几种遗传模型发现,SBDS在胚胎发育中具有重要作用,但是SBDS在癌症中的作用目前尚不清楚。

在该研究中,研究人员发现在人类癌症中,SBDS通常呈过表达,而内源性高表达水平的SBDS与患者的不良预后显著相关。相反的,敲低SBDS可以通过核糖体应激-RPL5/RPL11-MDM2信号途径介导p53的稳定及激活,进而抑制癌细胞的增殖及侵袭作用。

有趣的是,体内外实验发现SBDS在细胞核中的异常定位也能够抑制肿瘤细胞的生长及增殖。机制研究证实,SBDS的异位表达由核糖体应激所触发,其与p53的反式激活结构域结合,扰乱MDM2与p53的相互作用,进而导致p53的泛素化及蛋白酶体途径降解作用的受损。

以上研究结果通过核糖体合成及p53活性的协同研究,首次证明了SBDS在癌症发生发展过程中的双重功能。

原始出处:

Hao et al. Dual regulation of p53 by the ribosome maturation factor SBDS. Cell Death and Disease ( 2020) 11:197

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    2020-11-28 liuyg0228
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    2020-04-19 docwu2019
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    2020-04-05 zhishijing
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