Ki67 is a Graded Rather than a Binary Marker of Proliferation versus Quiescence.

Ki67 is a Graded Rather than a Binary Marker of Proliferation versus Quiescence.
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DOI:
10.1016/j.celrep.2018.06.110
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发表时间:
2018-07-31
期刊:
影响因子:
8.8
通讯作者:
Spencer SL
Spencer SL
中科院分区:
生物学1区
文献类型:
--
作者:
Miller I;Min M;Yang C;Tian C;Gookin S;Carter D;Spencer SL

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Ki 67染色在临床上被广泛用作增殖指标,尽管对这种蛋白质的功能或动力学的了解很少。在这里,我们跟踪Ki 67水平的内源性控制下的单细胞随着时间的推移,发现Ki 67积累只发生在S,G2和M期。Ki 67在G1和G 0期持续降解,无论进入G 0/静止期的原因如何。因此,Ki 67在G 0和G1期间在单个细胞中的水平是高度异质性的,并且取决于单个细胞在G 0中度过了多长时间。因此,Ki 67是细胞周期进展和进入静止期后的时间的分级而不是二元标志物。Ki 67是肿瘤学中最广泛使用的增殖标志物之一。与其作为增殖相对于静止的二元标志物的典型用途相反,米勒等人发现Ki 67水平在静止细胞中稳定地衰减,这可能使更先进的临床应用成为可能。
Ki67 staining is widely used as a proliferation indicator in the clinic, despite poor understanding of this protein’s function or dynamics. Here, we track Ki67 levels under endogenous control in single cells over time and find that Ki67 accumulation occurs only during S, G2, and M phases. Ki67 is degraded continuously in G1 and G0 phases, regardless of the cause of entry into G0/quiescence. Consequently, the level of Ki67 during G0 and G1 in individual cells is highly heterogeneous and depends on how long an individual cell has spent in G0. Thus, Ki67 is a graded rather than a binary marker both for cell-cycle progression and time since entry into quiescence. Ki67 is one of the most widely used markers of proliferation in oncology. Contrary to its canonical use as a binary marker of proliferation versus quiescence, Miller et al. find that Ki67 levels decay steadily in quiescent cells, which may enable more advanced clinical applications.
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