Atsushi Kohso, Hironori Inaba, Masato T. Kanemaki, Esteban C. Gabazza, Hidemi Toyoda, Masahiro Hirayama, Hidemasa Goto
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引用次数: 0
Abstract
Aurora-A (AurA) is a member of the mitotic kinase family and is highly expressed in various tumors. Inhibition of AurA generally leads to fetal mitotic errors. We previously reported that AurA inhibition induces G0/G1 cell cycle arrest in noncancerous cells by promoting the reassembly of primary cilia. However, the mechanisms by which AurA regulates cell cycle progression beyond mitosis remain largely unknown. In this study, we generated noncancerous RPE1 and cancerous HCT116 cell lines expressing endogenous AurA tagged with a minimal auxin-inducible degron (mAID) using CRISPR/Cas9-based gene editing. This system enabled specific and rapid depletion of endogenous AurA protein. By combining this approach with cell synchronization in RPE1 cells, we investigated AurA function specifically in the transition from quiescence to the proliferative cell cycle. Targeted degradation of AurA not only delayed cell cycle progression but also impaired the disassembly of primary cilia at the G0/G1 transition in RPE1 cells. Since this delay in cell cycle progression was rescued by forced deciliation via the knockout of IFT20, AurA facilitates deciliation, which in turn accelerates the transition from quiescence to the proliferative phase of the cell cycle in RPE1 cells. AurA depletion for 4 days increased apoptotic markers in HCT116 cells but not in RPE1 cells. Notably, forced deciliation in RPE1 cells partially enhanced apoptosis induced by AurA depletion. These results suggest that the ability to assemble primary cilia may serve as a protective mechanism against cell death following AurA inhibition.
期刊介绍:
Cancer Science (formerly Japanese Journal of Cancer Research) is a monthly publication of the Japanese Cancer Association. First published in 1907, the Journal continues to publish original articles, editorials, and letters to the editor, describing original research in the fields of basic, translational and clinical cancer research. The Journal also accepts reports and case reports.
Cancer Science aims to present highly significant and timely findings that have a significant clinical impact on oncologists or that may alter the disease concept of a tumor. The Journal will not publish case reports that describe a rare tumor or condition without new findings to be added to previous reports; combination of different tumors without new suggestive findings for oncological research; remarkable effect of already known treatments without suggestive data to explain the exceptional result. Review articles may also be published.