Polycomb group protein Bmi1 is required for growth of RAF driven non-small-cell lung cancer.

Polycomb group protein Bmi1 is required for growth of RAF driven non-small-cell lung cancer.
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DOI:
10.1371/journal.pone.0004230
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Rapp UR
Rapp UR
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Becker M;Korn C;Sienerth AR;Voswinckel R;Luetkenhaus K;Ceteci F;Rapp UR

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我们之前已经描述了一种RAF癌基因驱动的非小细胞肺癌转基因小鼠模型。在这里,我们研究肿瘤的启动和生长是否需要干细胞自我更新因子Bmi1。为了评估Bmi1在非小细胞肺癌中的功能,比较了两个在肿瘤形成发生率和潜伏期方面不同的方正细胞系。在这两种细胞系中,Bmi1表达的消融显著降低了肿瘤的生长。由于潜伏期较短的品系与Bmi1基因敲除小鼠的寿命相匹配,因此选择这些小鼠进行进一步研究。缺乏Bmi1并没有减少这些小鼠的肿瘤起始数量,因为只有肿瘤的大小而不是数量减少了。肿瘤生长的减少是由于细胞死亡增加和细胞周期进展减少,这与p16INK4a和p19ARF的上调相对应。数据表明,Bmi1是RAF驱动的NSCLC扩张而不是启动的重要因素。
We have previously described a RAF oncogene driven transgenic mouse model for non small cell lung cancer (NSCLC). Here we examine whether tumor initiation and growth requires the stem cell self-renewal factor Bmi1. In order to evaluate Bmi1 function in NSCLC two founder lines that differ in incidence and latency of tumor formation were compared. Ablation of Bmi1 expression in both lines had a dramatically decreased tumor growth. As the line with shorter latency matched the life span of Bmi1 knock out mice, these mice were chosen for further study. The absence of Bmi1 did not decrease the number of tumor initiation in these mice as only the size and not the number of tumors decreased. Reduction in tumor growth resulted from an increase in cell death and decrease in cell cycle progression that corresponded with up-regulation of the p16INK4a and p19ARF. The data identifies Bmi1 as an important factor for expansion but not initiation of RAF driven NSCLC.
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