A high-frequency regulatory polymorphism in the p53 pathway accelerates tumor development.

A high-frequency regulatory polymorphism in the p53 pathway accelerates tumor development.
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DOI:
10.1016/j.ccr.2010.07.010
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发表时间:
2010-09-14
期刊:
影响因子:
50.3
通讯作者:
Lozano G
Lozano G
中科院分区:
医学1区
文献类型:
--
作者:
Post SM;Quintás-Cardama A;Pant V;Iwakuma T;Hamir A;Jackson JG;Maccio DR;Bond GL;Johnson DG;Levine AJ;Lozano G

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MDM 2是p53的负调节因子,在许多保留野生型p53的癌症中升高。人MDM 2启动子中的单核苷酸多态性(SNP)增加了Sp1的亲和力,导致MDM 2水平升高。我们产生了携带MDM 2SNP 309 T或MDM 2SNP 309 G等位基因的小鼠,以解决MDM 2SNP 309 G对肿瘤发生的影响。Mdm 2SNP 309 G/G细胞表现出Mdm 2水平升高、p53水平降低和凋亡减少。重要的是,一些Mdm 2SNP 309 G/G小鼠在一岁之前死于肿瘤,这表明该等位基因增加了肿瘤风险。此外,Mdm 2SNP 309 G等位基因增强了肿瘤表型,并改变了遗传p53热点突变的小鼠的肿瘤谱。这些数据为Mdm 2SNP 309 G等位基因携带者癌症风险增加提供了因果证据。
MDM2, a negative regulator of p53, is elevated in many cancers that retain wild-type p53. A single nucleotide polymorphism (SNP) in the human MDM2 promoter increases the affinity of Sp1 resulting in elevated MDM2 levels. We generated mice carrying either the MDM2SNP309T or the MDM2SNP309G allele to address the impact of MDM2SNP309G on tumorigenesis. Mdm2SNP309G/G cells exhibit elevated Mdm2 levels, reduced p53 levels, and decreased apoptosis. Importantly, some Mdm2SNP309G/G mice succumbed to tumors before one year of age, suggesting that this allele increases tumor risk. Additionally, the Mdm2SNP309G allele potentiates the tumor phenotype and alters tumor spectrum in mice inheriting a p53 hot-spot mutation. These data provide causal evidence for increased cancer risk in carriers of the Mdm2SNP309G allele.
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