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IMPDH1/YB-1 Positive Feedback Loop Assembles Cytoophidia and Represents a Therapeutic Target in Metastatic Tumors.
Molecular Therapy ( IF 12.1 ) Pub Date : 2020-03-10 , DOI: 10.1016/j.ymthe.2020.03.001
Hailong Ruan 1 , Zhengshuai Song 1 , Qi Cao 1 , Dong Ni 1 , Tianbo Xu 1 , Keshan Wang 1 , Lin Bao 1 , Junwei Tong 1 , Haibing Xiao 1 , Wen Xiao 1 , Gong Cheng 1 , Zhiyong Xiong 1 , Huageng Liang 1 , Di Liu 1 , Liang Wang 1 , Tredan Olivier 2 , Boyle Helen Jane 2 , Hongmei Yang 3 , Xiaoping Zhang 1 , Ke Chen 1
Affiliation  

Recently, cytoophidium, a nonmembrane-bound intracellular polymeric structure, has been shown to exist in various organisms, including tumor tissues, but its function and mechanism have not yet been examined. Examination of cytoophidia-assembled gene inosine monophosphate dehydrogenase (IMPDH) and cytidine triphosphate synthetase (CTPS) mRNA levels showed that only IMPDH1 levels were significantly higher in the clear cell renal cell carcinoma (ccRCC). IMPDH1 was positively correlated with the metastasis-related gene Y-box binding protein 1 (YB-1) and served as an independent prognostic factor in ccRCC. Kaplan-Meier analysis indicated that patients with tumors that expressed high IMPDH1 levels had a shorter overall survival (OS) and disease-free survival (DFS). Furthermore, detection of cytoophidia by immunofluorescence staining in ccRCC tissues showed that IMPDH1-assembled cytoophidia are positively associated with tumor metastasis. Mechanistically, IMPDH1 and YB-1 formed an autoregulatory positive feedback loop: IMPDH1 maintained YB-1 protein stabilization; YB-1 induced IMPDH1 expression by binding to the IMPDH1 promoter motif. Functionally, IMPDH1-assembled cytoophidia physically interacted with YB-1 and translocated YB-1 into the cell nucleus, thus correlating with ccRCC metastasis. Our findings provide the first solid theoretical rationale for targeting the IMPDH1/YB-1 axis to improve metastatic renal cancer treatment.

中文翻译:

IMPDH1 / YB-1正反馈回路组装细胞分裂症,并代表转移性肿瘤的治疗目标。

近来,已经证明细胞膜,一种非膜结合的细胞内聚合物结构,存在于包括肿瘤组织在内的各种生物中,但是尚未对其功能和机制进行研究。检查细胞分裂症组装基因肌苷单磷酸脱氢酶(IMPDH)和胞苷三磷酸合成酶(CTPS)mRNA水平表明,在透明细胞肾细胞癌(ccRCC)中,只有IMPDH1水平显着更高。IMPDH1与转移相关基因Y-box结合蛋白1(YB-1)正相关,并作为ccRCC中的独立预后因子。Kaplan-Meier分析表明,具有高IMPDH1水平的肿瘤患者的总生存期(OS)和无病生存期(DFS)较短。此外,ccRCC组织中免疫荧光染色检测到的细胞吞噬作用表明,IMPDH1组装的细胞吞噬作用与肿瘤转移呈正相关。从机理上讲,IMPDH1和YB-1形成了一个自动调节的正反馈回路:IMPDH1保持YB-1蛋白的稳定;YB-1通过与IMPDH1启动子基序结合来诱导IMPDH1表达。在功能上,IMPDH1组装的胞吞虫与YB-1发生物理相互作用,并将YB-1转运到细胞核中,从而与ccRCC转移相关。我们的发现为针对IMPDH1 / YB-1轴改善转移性肾癌治疗提供了第一个坚实的理论基础。IMPDH1维持YB-1蛋白质稳定;YB-1通过与IMPDH1启动子基序结合来诱导IMPDH1表达。在功能上,IMPDH1组装的胞吞虫与YB-1发生物理相互作用,并将YB-1转运到细胞核中,从而与ccRCC转移相关。我们的发现为针对IMPDH1 / YB-1轴改善转移性肾癌治疗提供了第一个坚实的理论基础。IMPDH1维持YB-1蛋白质稳定;YB-1通过与IMPDH1启动子基序结合来诱导IMPDH1表达。在功能上,IMPDH1组装的胞吞虫与YB-1发生物理相互作用,并将YB-1转运到细胞核中,从而与ccRCC转移相关。我们的发现为针对IMPDH1 / YB-1轴改善转移性肾癌治疗提供了第一个坚实的理论基础。
更新日期:2020-03-10
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