The retinoblastoma gene Rb and its family member p130 suppress lung adenocarcinoma induced by oncogenic K-Ras.

The retinoblastoma gene Rb and its family member p130 suppress lung adenocarcinoma induced by oncogenic K-Ras.
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DOI:
10.1038/onc.2008.491
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发表时间:
2009-03-12
期刊:
影响因子:
8
通讯作者:
Sage, J.
Sage, J.
中科院分区:
医学1区
文献类型:
--
作者:
Ho, V. M.;Schaffer, B. E.;Karnezis, A. N.;Park, K. S.;Sage, J.

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视网膜母细胞瘤肿瘤抑制基因RB的突变经常在人类癌症中观察到,但很少在非小细胞肺癌(NSCLC)中观察到。新出现的证据还表明,RB相关基因p130在人类NSCLC的一个子集中失活。为了直接测试RB和p130在NSCLC中的特异性肿瘤抑制作用,我们将Rb和p130条件突变小鼠与携带条件致癌K-Ras等位基因的小鼠杂交。在该模型中,受控的致癌K-Ras激活导致腺癌(NSCLC的一种主要亚型)的发展。我们发现p130的缺失加速了小鼠的死亡,这为p130是一种肿瘤抑制基因提供了直接的体内证据,尽管在这种情况下,p130是一种微弱的基因。Rb的缺失增加了肺癌发生的效率,并导致高级别腺癌的发展和快速死亡。因此,尽管人NSCLC中RB突变的频率低,并且报道在相同的人肿瘤中很少发现K-Ras激活和RB功能丧失,但在小鼠肺腺癌发展中,Rb的丧失显然与致癌K-Ras的激活协同作用。
Mutations of the retinoblastoma tumor suppressor gene RB are frequently observed in human cancers, but rarely in non-small cell lung carcinomas (NSCLCs). Emerging evidence also suggests that the RB-related gene p130 is inactivated in a subset of human NSCLCs. To directly test the specific tumor suppressor roles of RB and p130 in NSCLC, we crossed Rb and p130 conditional mutant mice to mice carrying a conditional oncogenic K-Ras allele. In this model, controlled oncogenic K-Ras activation leads to the development of adenocarcinoma, a major subtype of NSCLC. We found that loss of p130 accelerated the death of mice, providing direct evidence in vivo that p130 is a tumor suppressor gene, albeit a weak one in this context. Loss of Rb increased the efficiency of lung cancer initiation and resulted in the development of high-grade adenocarcinomas and rapid death. Thus, despite the low frequency of RB mutations in human NSCLCs and reports that K-Ras activation and loss of RB function are rarely found in the same human tumors, loss of Rb clearly cooperates with activation of oncogenic K-Ras in lung adenocarcinoma development in mice.
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