Sotillo Rocío, Hernando Eva, Díaz-Rodríguez Elena, Teruya-Feldstein Julie, Cordón-Cardo Carlos, Lowe Scott W, Benezra Robert
Cancer Biology and Genetics Program, Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
Cancer Cell. 2007 Jan;11(1):9-23. doi: 10.1016/j.ccr.2006.10.019. Epub 2006 Dec 28.
Mad2 is an essential component of the spindle checkpoint that blocks activation of Separase and dissolution of sister chromatids until microtubule attachment to kinetochores is complete. We show here that overexpression of Mad2 in transgenic mice leads to a wide variety of neoplasias, appearance of broken chromosomes, anaphase bridges, and whole-chromosome gains and losses, as well as acceleration of myc-induced lymphomagenesis. Moreover, continued overexpression of Mad2 is not required for tumor maintenance, unlike the majority of oncogenes studied to date. These results demonstrate that transient Mad2 overexpression and chromosome instability can be an important stimulus in the initiation and progression of different cancer subtypes.
Mad2是纺锤体检查点的一个重要组成部分,它会阻止Separase的激活以及姐妹染色单体的分离,直到微管与动粒的附着完成。我们在此表明,在转基因小鼠中Mad2的过表达会导致多种肿瘤形成、出现断裂染色体、后期桥以及整条染色体的增减,还会加速myc诱导的淋巴瘤发生。此外,与迄今为止研究的大多数癌基因不同,Mad2的持续过表达并非肿瘤维持所必需。这些结果表明,Mad2的短暂过表达和染色体不稳定性可能是不同癌症亚型起始和进展的重要刺激因素。