Diverse Ras-related GTPase DIRAS2, downregulated by PSMD2 in a proteasome-mediated way, inhibits colorectal cancer proliferation by blocking NF-κB signaling.

Diverse Ras-related GTPase DIRAS2, downregulated by PSMD2 in a proteasome-mediated way, inhibits colorectal cancer proliferation by blocking NF-κB signaling.
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DOI:
10.7150/ijbs.68312
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发表时间:
2022
影响因子:
9.2
通讯作者:
Hu X
Hu X
中科院分区:
生物学2区
文献类型:
--
作者:
Ying K;Wang C;Liu S;Kuang Y;Tao Q;Hu X

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结直肠癌(Colorectal cancer,CRC)是最常见的胃肠道恶性肿瘤,死亡率高,但治疗靶点有限。DIRAS家族GT3 2(DIRAS 2)是Ras相关的小G蛋白家族的成员,其在CRC中的生物学功能和潜在机制仍然知之甚少。在这项研究中,我们确定了DIRAS 2在CRC中的关键作用。DIRAS 2在大肠癌中表达下调,且与不良预后密切相关。在功能上,DIRAS 2抑制CRC细胞增殖并影响细胞周期蛋白的表达。DIRAS 2在机制上阻断了活化B细胞信号通路的核因子κ轻链增强子,诱导G 0/G1阻滞。此外,DIRAS 2与26 S蛋白酶体非ATP酶调节亚基2相互作用,从而以蛋白酶体介导的方式促进DIRAS 2的降解。总之,这些结果证明了DIRAS 2作为CRC中的肿瘤抑制基因的潜在功能,并揭示了DIRAS 2在CRC肿瘤发生中的独特机制,表明其作为CRC治疗的潜在生物标志物和靶标的作用。
Colorectal cancer (CRC) is the most common gastrointestinal cancer, with a high mortality rate but limited therapeutic targets. DIRAS family GTPase 2 (DIRAS2) is a member of the Ras-related small G-protein family whose biological functions and underlying mechanism in CRC remain poorly understood. In this study, we identified the crucial roles of DIRAS2 in CRC. DIRAS2 expression was downregulated in CRC and closely correlated with poor prognosis. Functionally, DIRAS2 inhibited CRC cell proliferation and affected cell-cycle protein expression. Mechanistically, DIRAS2 blocked nuclear factor kappa light-chain enhancer of activated B-cell signaling pathways, inducing G0/G1 arrest. Moreover, DIRAS2 interacted with 26S proteasome non-ATPase regulatory subunit 2, which facilitates the degradation of DIRAS2 in a proteasome-mediated way. Together, these results demonstrate potential functions of DIRAS2 as a tumor-suppressor gene in CRC and reveal a distinct mechanism of DIRAS2 in CRC tumorigenesis, indicating its role as a potential biomarker and target for CRC therapy.
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