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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
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在瘤性压力介导的p53反应中,转录独立的ARF调节
Delin Chen1, Jing Shan, Wei-Guo Zhu
1Institute for Cancer Genetics, and Department of Pathology and Cell Biology College of Physicians & Surgeons, Columbia University, 1130 St Nicholas Avenue, New York, New York 10032, USA.
Nature
|March 9, 2010
概括
瘤抑制剂ARF在正常细胞中不稳定,但在癌症中稳定. 一种新发现的全方位化酶,ULF,针对ARF进行降解,揭示了一个动态的ARF-p53通路,对瘤抑制至关重要.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 细胞调节 细胞调节 细胞调节
背景情况:
- ARF-p53通路对于瘤抑制至关重要,特别是在瘤性压力下.
- 以前的假设表明ARF稳定性和缓慢的转录诱导,与更快的DNA损伤诱导的p53激活形成对比.
- 在瘤抑制中ARF-p53轴的作用比以前理解的更为基本.
研究的目的:
- 研究ARF稳定性的调节及其在ARF-p53通路中的作用.
- 确定控制正常和癌细胞中ARF降解和稳定因素.
- 阐明ARF调控中的转录独立机制.
主要方法:
- 生物化学净化以识别ARF相互作用蛋白质.
- 在体外和体内,ARF与已识别的酶之间的相互作用研究.
- 化和降解试验.
- 对已识别的泛素合酶进行了淘汰性研究.
- 在过度表达NPM和c-Myc的癌细胞中分析ARF稳定.
主要成果:
- 在正常人体细胞中ARF是不稳定的,但在癌细胞中稳定.
- 确定了一种特定的无处不在酶,ULF,它针对ARF进行无处不在和降解.
- 抑制ULF稳定正常细胞中的ARF,导致p53介导的生长停止.
- 过度表达的NPM和c-Myc取消了ULF介导的ARF无处不在,促进了癌症中的ARF稳定.
结论:
- ARF调节是动态的,涉及正常细胞的快速降解,在癌症中受损.
- 无素酶ULF是ARF稳定性的关键调节者.
- 受NPM和c-Myc影响的转录独立机制对于瘤性应激反应中的ARF调节至关重要.
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