A tumor suppressor role of the Bub3 spindle checkpoint protein after apoptosis inhibition.

A tumor suppressor role of the Bub3 spindle checkpoint protein after apoptosis inhibition.
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DOI:
10.1083/jcb.201210018
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发表时间:
2013-04-29
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Sunkel CE
Sunkel CE
中科院分区:
其他
文献类型:
--
作者:
Morais da Silva S;Moutinho-Santos T;Sunkel CE

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当细胞凋亡受损时,纺锤体检查点蛋白Bub3的丢失足以诱导非整倍体并推动肿瘤的发生。大多数实体瘤含有非整倍体细胞,这表明有丝分裂检查点允许染色体异常细胞的增殖。然而,有丝分裂检查点基因的突变或改变表达在人类肿瘤中只占很小的比例。我们描述了一种果蝇黑腹果蝇肿瘤发生模型,该模型源于击倒纺锤体组装检查点(SAC)基因并防止翅膀成像盘中的细胞凋亡。同样缺乏凋亡的BUB3缺陷肿瘤在移植到成年果蝇体内后显示出肿瘤生长、染色体非整倍体和高增殖潜力。通过敲除CENP-E和阻止细胞凋亡诱导非整倍体并不能诱导肿瘤的发生,表明非整倍体不足以促进增殖。在这个系统中,由SAC缺陷引起的非整倍体不会驱动肿瘤的发生,因为阻止Bub3与动粒结合并不会导致过度增殖。我们的数据表明,Bub3具有非动粒依赖的功能,这与其作为肿瘤抑制因子的作用是一致的。
The loss of the spindle checkpoint protein Bub3 is sufficient to induce aneuploidy and drive tumorigenesis when apoptosis is compromised. Most solid tumors contain aneuploid cells, indicating that the mitotic checkpoint is permissive to the proliferation of chromosomally aberrant cells. However, mutated or altered expression of mitotic checkpoint genes accounts for a minor proportion of human tumors. We describe a Drosophila melanogaster tumorigenesis model derived from knocking down spindle assembly checkpoint (SAC) genes and preventing apoptosis in wing imaginal discs. Bub3-deficient tumors that were also deficient in apoptosis displayed neoplastic growth, chromosomal aneuploidy, and high proliferative potential after transplantation into adult flies. Inducing aneuploidy by knocking down CENP-E and preventing apoptosis does not induce tumorigenesis, indicating that aneuploidy is not sufficient for hyperplasia. In this system, the aneuploidy caused by a deficient SAC is not driving tumorigenesis because preventing Bub3 from binding to the kinetochore does not cause hyperproliferation. Our data suggest that Bub3 has a nonkinetochore-dependent function that is consistent with its role as a tumor suppressor.
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