The DOI matches its Crossref record; 48 of the 48 references it cites were found in a registry or an index.
Cell-Cycle Regulation Accounts for Variability in Ki-67 Expression Levels
Abstract
The cell proliferation antigen Ki-67 is widely used in cancer histopathology, but estimations of Ki-67 expression levels are inconsistent and understanding of its regulation is limited. Here we show that cell-cycle regulation underlies variable Ki-67 expression in all situations analyzed, including nontransformed human cells, normal mouse intestinal epithelia and adenomas, human cancer cell lines with or without drug treatments, and human breast and colon cancers. In normal cells, Ki-67 was a late marker of cell-cycle entry; Ki-67 mRNA oscillated with highest levels in G2 while protein levels increased throughout the cell cycle, peaking in mitosis. Inhibition of CDK4/CDK6 revealed proteasome-mediated Ki-67 degradation in G1. After cell-cycle exit, low-level Ki-67 expression persisted but was undetectable in fully quiescent differentiated cells or senescent cells. CDK4/CDK6 inhibition in vitro and in tumors in mice caused G1 cell-cycle arrest and eliminated Ki-67 mRNA in RB1-positive cells but had no effect in RB1-negative cells, which continued to proliferate and express Ki-67. Thus, Ki-67 expression varies due to cell-cycle regulation, but it remains a reliable readout for effects of CDK4/CDK6 inhibitors on cell proliferation. Cancer Res; 77(10); 2722–34. ©2017 AACR.
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Cited by
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Metadata
- Authors
- Sobecki, M., Mrouj, K., Colinge, J., Gerbe, F., Jay, P., Krasinska, L., Dulic, V., & Fisher, D.
- Venue
- Cancer Research
- Published
- 2017-05-14
- Volume
- 77
- Issue
- 10
- Pages
- 2722-2734
- ISSN
- 0008-5472 (ISSN-L)
- 1538-7445
- OpenAlex
- W2593901831
- Cited by
- 375
- References
- 48
- FWCI
- 9.26
- Type
- journal article
- Language
- en
- Open access
- closed
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