泛素连接酶
泛素
抑制器
癌症研究
癌变
结直肠癌
蛋白酶体
细胞凋亡
细胞生物学
细胞生长
化学
体内
生物
癌症
生物化学
基因
遗传学
作者
Shengjie Feng,Qiu‐An Huang,Jiao Deng,Wentao Jia,Jianping Gong,Daxing Xie,Jie Shen,Liang Liu
出处
期刊:Cancer Letters
[Elsevier]
日期:2022-04-01
卷期号:532: 215588-215588
被引量:11
标识
DOI:10.1016/j.canlet.2022.215588
摘要
Increasing evidence has shown that DAB2IP acts as a tumor suppressor and plays an inhibitory role in many signals associated with tumorigenesis. However, the underlying mechanism of this function remains unclear. Our study shows that DAB2IP was positively associated with a good prognosis in patients with colorectal cancer and wild-type p53 expression. An in vitro assay showed that DAB2IP elicited potent tumor-suppressive effects by inhibiting cell invasiveness and colony formation and promoting cell apoptosis in wild-type p53 colon cancer cells. In addition, DAB2IP improved the stability of wild-type p53 by inhibiting its degradation in a ubiquitin-proteasome-dependent manner. Using mass spectrometry profiling, we revealed that DAB2IP and p53 interacted with the ubiquitin ligase-related protein GRP75. Mechanistically, DAB2IP is competitively bound to GRP75, thus reducing GRP75-driven p53 ubiquitination and degradation. Moreover, the Ras-GAP domain was required for the DAB2IP-GRP75 interaction and DAB2IP-mediated p53 ubiquitination. Finally, animal experiments revealed that DAB2IP inhibited tumor progression in vivo. In conclusion, our study presents a novel function of DAB2IP in GRP75-driven wild-type p53 degradation, providing new insight into DAB2IP-induced tumor suppression and a novel molecular interpretation of the p53 pathway.
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