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首页> 外文期刊>Molecular and Cellular Biology >Abolition of Cyclin-Dependent Kinase Inhibitor p16Ink4a and p21Cip1/Waf1 Functions Permits Ras-Induced Anchorage-Independent Growth in Telomerase-Immortalized Human Fibroblasts
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Abolition of Cyclin-Dependent Kinase Inhibitor p16Ink4a and p21Cip1/Waf1 Functions Permits Ras-Induced Anchorage-Independent Growth in Telomerase-Immortalized Human Fibroblasts

机译:取消细胞周期蛋白依赖性激酶抑制剂p16Ink4a和p21Cip1 / Waf1功能允许端粒酶固定的人类成纤维细胞中的ras诱导的锚定非依赖性生长。

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Human cells are more resistant to both immortalization and malignant transformation than rodent cells. Recent studies have established the basic genetic requirements for the transformation of human cells, but much of this work relied on the expression of transforming proteins derived from DNA tumor viruses. We constructed an isogenic panel of human fibroblast cell lines using a combination of gene targeting and ectopic expression of dominantly acting mutants of cellular genes. Abolition of p21Cip1/Waf1 and p16Ink4a functions prevented oncogenically activated Ras from inducing growth arrest and was sufficient for limited anchorage-independent growth but not tumorigenesis. Deletion of the tumor suppressor p53 combined with abolition of p16Ink4a function failed to mimic the introduction of simian virus 40 large T antigen, indicating that large T antigen may target additional cellular functions. Ha-Ras and Myc cooperated only to a limited extent, but in the absence of Ras, Myc cooperated strongly with the simian virus 40 small t antigen to elicit aggressive anchorage-independent growth. The experiments reported here further define specific components of human transformation pathways.
机译:与啮齿动物细胞相比,人类细胞对永生化和恶性转化的抵抗力更高。最近的研究已经确定了人类细胞转化的基本遗传学要求,但是这项工作大部分依赖于表达自DNA肿瘤病毒的转化蛋白的表达。我们使用基因靶向和细胞基因显性作用突变体的异位表达相结合,构建了人类成纤维细胞细胞系的同基因面板。取消p21 Cip1 / Waf1 和p16 Ink4a 功能可阻止致癌的Ras诱导生长停滞,并且足以有限的不依赖于锚定的生长,但没有肿瘤发生。删除肿瘤抑制因子p53并废除p16 Ink4a 功能无法模仿猿猴病毒40大T抗原的引入,表明大T抗原可能靶向其他细胞功能。 Ha-Ras和Myc仅在有限的程度上合作,但是在没有Ras的情况下,Myc与猿猴病毒40小t抗原强烈合作,从而引发了侵袭性锚定非依赖性生长。本文报道的实验进一步定义了人类转化途径的特定组成部分。

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