Overexpression of the E2 ubiquitin-conjugating enzyme UbcH10 causes chromosome missegregation and tumor formation.

Overexpression of the E2 ubiquitin-conjugating enzyme UbcH10 causes chromosome missegregation and tumor formation.
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DOI:
10.1083/jcb.200906147
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发表时间:
2010-01-11
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
van Deursen JM
van Deursen JM
中科院分区:
其他
文献类型:
--
作者:
van Ree JH;Jeganathan KB;Malureanu L;van Deursen JM

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过量的UbcH 10由于细胞周期蛋白B的降解而破坏有丝分裂检查点信号传导,从而增加转基因小鼠中自发和致癌物诱导的肿瘤形成。后期促进复合物/环体(APC/C)E3泛素连接酶的功能与E2泛素结合酶UbcH 10的有序进展,通过有丝分裂的26-S蛋白酶体的破坏标记的关键有丝分裂调节。UbcH 10在许多人类癌症类型中过表达,并与肿瘤进展相关。然而,UbcH 10过表达是否导致肿瘤形成尚不清楚。为了解决这个中心问题并定义UbcH 10过表达的分子和细胞后果,我们产生了一系列转基因小鼠,其中UbcH 10以分级方式过表达。在这项研究中,我们发现UbcH 10过表达导致APC/C、多余中心粒、落后染色体和非整倍体过早降解细胞周期蛋白B。重要的是,我们发现UbcH 10转基因小鼠容易发生致癌物诱导的肺肿瘤和广泛的自发性肿瘤。我们的研究结果确定UbcH 10作为一个突出的原癌基因,导致整个染色体的不稳定性和肿瘤的形成在一个广泛的梯度过表达水平。
An overabundance of UbcH10 disrupts mitotic checkpoint signaling as a result of a degradation of cyclin B, increasing spontaneous and carcinogen-induced tumor formation in transgenic mice. The anaphase-promoting complex/cyclosome (APC/C) E3 ubiquitin ligase functions with the E2 ubiquitin–conjugating enzyme UbcH10 in the orderly progression through mitosis by marking key mitotic regulators for destruction by the 26-S proteasome. UbcH10 is overexpressed in many human cancer types and is associated with tumor progression. However, whether UbcH10 overexpression causes tumor formation is unknown. To address this central question and to define the molecular and cellular consequences of UbcH10 overexpression, we generated a series of transgenic mice in which UbcH10 was overexpressed in graded fashion. In this study, we show that UbcH10 overexpression leads to precocious degradation of cyclin B by the APC/C, supernumerary centrioles, lagging chromosomes, and aneuploidy. Importantly, we find that UbcH10 transgenic mice are prone to carcinogen-induced lung tumors and a broad spectrum of spontaneous tumors. Our results identify UbcH10 as a prominent protooncogene that causes whole chromosome instability and tumor formation over a wide gradient of overexpression levels.
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