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• W2036729837 abstract "We previously identified SIRT2, a deacetylase for tubulin and histone H4, as a protein downregulated in gliomas, and reported that exogenously-expressed SIRT2 arrests the cell cycle prior to entry into mitosis to prevent chromosomal instability in response to microtubule inhibitors (MTIs) such as nocodazole, characteristics previously reported for the CHFR protein. We herein investigated the effects of SIRT2 downregulation on sensitivity to MTIs using HCT116 cells, a mitotic checkpoint-proficient near-diploid cancer cell line used for studying checkpoints. We found that SIRT2 downregulation confers resistance to MTIs as well as that of BubR1, a well-characterized mitotic checkpoint protein, though by a different mechanism. While BubR1 suppression abolished spindle checkpoint functions, which is a requirement for cell death after release from the spindle checkpoint, SIRT2 downregulation prolonged chronic mitotic arrest from sustained activation of the mitotic checkpoint and consequently prevented a shift to secondary outcomes, including cell death, after release from chronic mitotic arrest. Consistent with this notion, BubR1 downregulation was dominant over SIRT2 knockdown in regard to mitotic regulation in the presence of nocodazole. These results suggest that SIRT2 functions to release chronic mitotic arrest in cells treated with MTIs, leading to other outcomes. We also found that SIRT2 downregulation caused centrosome fragmentation in response to nocodazole prior to the alteration in spindle checkpoint function, implying not only a novel function of SIRT2 for centrosome maintenance upon exposure to mitotic stress caused by MTIs, but also the existence of a centrosome-mediated signaling pathway to sustain the spindle checkpoint. Therefore, this study highlights a novel pathway leading to resistance to MTIs, in which SIRT2 downregulation participates." @default.
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• W2036729837 date "2009-04-15" @default.
• W2036729837 modified "2023-10-16" @default.
• W2036729837 title "SIRT2 downregulation confers resistance to microtubule inhibitors by prolonging chronic mitotic arrest" @default.
• W2036729837 doi "https://doi.org/10.4161/cc.8.8.8245" @default.
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