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去泛素化酶从不同底物上移除泛素,起到调控蛋白质活性和维持细胞内环境稳态的作用。去泛素化酶在细胞的转录后修饰过程中发挥重要作用,当去泛素化酶调控机制出现异常则会引起不同类型疾病的发生。而异常表达特异性去泛素化酶22( USP22)常与癌症预后不良有关。本文就USP22在肿瘤中的研究现状进行综述。 相似文献
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泛素化修饰是蛋白质降解的信号,调节体内蛋白质翻译后修饰的重要途径之一[1] ,密切参与细胞周期、信号转导、DNA修复、免疫反应、转录调控等. 泛素化修饰中的泛素连接酶与肿瘤的发生、发展密切相关[2]. 泛素化修饰被3种关键酶共同介导,其中E3泛素连接酶介导活泛素分子从结合酶E2转移到底物,不同的泛素连接酶靶向不同的底物蛋白,决定泛素化修饰的特异性,故E3连接酶于泛素化修饰中具有至关重要作用,已成为当前研究、探讨的热点问题之一. 相似文献
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肿瘤细胞在有氧条件下仍以产生较少 ATP 的糖酵解为主要代谢方式, 这一重要特征被称为 Warburg 效应.Warburg 效应可以为肿瘤细胞快速供能, 同时产生的中间代谢产物可用以合成蛋白质、 核酸及脂类等生物大分子,为肿瘤细胞的生长和增殖提供必需的物质基础,在肿瘤细胞抗凋亡、增殖和肿瘤微环境形成和维持中发挥至关重要的作用. 本文针对Warburg 效应关键酶在胃癌中的影响研究进展进行综述. 相似文献
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类泛素蛋白是一类与泛素有类似空间结构及酶修饰系统的蛋白质,它们在调节蛋白质功能中发挥着重要作用。类泛素蛋白主要通过对底物蛋白进行类泛素化修饰而发挥核质转运、转录调节、稳定蛋白质、应激反应以及细胞周期调控等多种生物学功能。近年来有大量的研究表明类泛素蛋白功能失调与肝癌的发生、增殖、凋亡以及血管新生等过程密切相关;并且在抗肿瘤药物的研究中也发现,通过调控类泛素化修饰过程可以改变化疗药物的抗肿瘤作用,进而影响肝癌的化疗敏感性,这表明类泛素蛋白可能成为一个新的肿瘤防治靶点。探究类泛素蛋白在肝癌发生、发展中的作用机制对诊断和治疗肝癌有着重要作用。 相似文献
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泛素蛋白酶体系统(ubiquitin proteasome system, UPS)能够介导真核细胞中80%以上蛋白质的降解,对底物的蛋白稳定和功能发挥起到关键作用。作为一种重要的泛素化修饰调控因子,去泛素化酶能够从底物上切割泛素,修饰泛素链并加工泛素前体,与多种生理病理过程密切相关。其中,去泛素化酶PSMD14(proteasome 26S subunit,non-ATPase 14)位于蛋白酶体26S亚基,是一种非ATP酶组分。近年来,其在肿瘤发生发展中的作用越来越受到关注。本文将对PSMD14的结构、作用机制及其抑制剂在肿瘤中的研究进展进行综述。 相似文献
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肿瘤细胞在氧含量充足的情况下仍倾向于糖酵解,被称之为Warburg效应,这是肿瘤细胞的重要特征之一,现在认为它是癌基因和抑癌基因共同作用的结果.目前研究表明microRNAs能够在转录后水平参与相关基因的表达,通过多种途径调节肿瘤细胞的糖代谢方式.其中丙酮酸激酶参与糖酵解的最后一个阶段,不同亚型的表达水平差异能调控糖代谢方式.本文着重探讨microRNAs调控丙酮酸激酶的作用机制,及其对肿瘤细胞产生的影响,为临床治疗提供理论基础. 相似文献
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Masashi Kitazawa Tomohisa Hatta Yusuke Sasaki Kazuhiko Fukui Koji Ogawa Eriko Fukuda Naoki Goshima Natsuko Okita Yasuhide Yamada Hitoshi Nakagama Tohru Natsume Katsuhisa Horimoto 《Cancer science》2020,111(2):658-666
Metabolic reprogramming, including the Warburg effect, is a hallmark of cancer. Indeed, the diversity of cancer metabolism leads to cancer heterogeneity, but accurate assessment of metabolic properties in tumors has not yet been undertaken. Here, we performed absolute quantification of the expression levels of 113 proteins related to carbohydrate metabolism and antioxidant pathways, in stage III colorectal cancer surgical specimens from 70 patients. The Warburg effect appeared in absolute protein levels between tumor and normal mucosa specimens demonstrated. Notably, the levels of proteins associated with the tricarboxylic citric acid cycle were remarkably reduced in the malignant tumors which had relapsed after surgery and treatment with 5‐fluorouracil‐based adjuvant therapy. In addition, the efficacy of 5‐fluorouracil also decreased in the cultured cancer cell lines with promotion of the Warburg effect. We further identified nine and eight important proteins, which are closely related to the Warburg effect, for relapse risk and 5‐fluorouracil benefit, respectively, using a biomarker exploration procedure. These results provide us a clue for bridging between metabolic protein expression profiles and benefit from 5‐fluorouracil adjuvant chemotherapy. 相似文献
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20世纪20年代,德国生化学家瓦伯格发现即使在有氧条件下,肿瘤细胞也是通过糖酵解的方式获得生存必需的能量,这一现象被称为瓦伯格效应。然而,后续越来越多的研究发现并非所有的肿瘤中均存在瓦伯格效应,或者说并非所有的肿瘤细胞均存在瓦伯格效应。肿瘤细胞的代谢存在明显的多样性,部分细胞表现为糖酵解方式产能,另外一部分细胞表现为氧化磷酸化方式产能。两类细胞能够通过乳酸穿梭机制相互协调,和谐共处,即代谢共生。本文将就代谢共生的物质基础和细胞间的代谢共生现象,以及代谢共生对肿瘤细胞特性的影响及临床意义方面作一综述。希望通过对代谢共生的全面认识为设计全新而高效的治疗策略提供有益的帮助。 相似文献
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A defining hallmark of glioblastoma is altered tumor metabolism. The metabolic shift towards aerobic glycolysis with reprogramming of mitochondrial oxidative phosphorylation, regardless of oxygen availability, is a phenomenon known as the Warburg effect. In addition to the Warburg effect, glioblastoma tumor cells also utilize the tricarboxylic acid cycle/oxidative phosphorylation in a different capacity than normal tissue. Altered metabolic enzymes and their metabolites are oncogenic and not simply a product of tumor proliferation. Here we highlight the advantages of why tumor cells, including glioblastoma cells, require metabolic reprogramming and how tumor metabolism can converge on tumor epigenetics and unanswered questions in the field. 相似文献
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Juan Liu Cen Zhang Rui Wu Meihua Lin Yingjian Liang Jia Liu Xiaolong Wang Bo Yang Zhaohui Feng 《Oncotarget》2015,6(17):14982-14992
Cancer cells preferentially use aerobic glycolysis to meet their increased energetic and biosynthetic demands, a phenomenon known as the Warburg effect. Its underlying mechanism is not fully understood. RRAD, a small GTPase, is a potential tumor suppressor in lung cancer. RRAD expression is frequently down-regulated in lung cancer, which is associated with tumor progression and poor prognosis. Recently, RRAD was reported to repress the Warburg effect, indicating that down-regulation of RRAD expression is an important mechanism contributing to the Warburg effect in lung cancer. However, the mechanism by which RRAD inhibits the Warburg effect remains unclear. Here, we found that RRAD negatively regulates the NF-κB signaling to inhibit the GLUT1 translocation and the Warburg effect in lung cancer cells. Mechanically, RRAD directly binds to the p65 subunit of the NF-κB complex and inhibits the nuclear translocation of p65, which in turn negatively regulates the NF-κB signaling to inhibit GLUT1 translocation and the Warburg effect. Blocking the NF-κB signaling largely abolishes the inhibitory effects of RRAD on the translocation of GLUT1 to the plasma membrane and the Warburg effect. Taken together, our results revealed a novel mechanism by which RRAD negatively regulates the Warburg effect in lung cancer cells. 相似文献