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:
影响因子:
--
通讯作者:
Sunkel CE
中科院分区:
文献类型:
--
作者:
Morais da Silva S;Moutinho-Santos T;Sunkel CE
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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