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YLZ-F5, a novel polo-like kinase 4 inhibitor, inhibits human ovarian cancer cell growth by inducing apoptosis and mitotic defects

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Abstract

Purpose

Polo-like kinase 4 (PLK4), a member of the polo-like kinase family, plays several important roles in mitotic regulation, including centrosome duplication, spindle formation, and cytokinesis. PLK4 overexpression is frequently detected in many human cancers, including ovarian cancer, and the inhibition of PLK4 activity results in cancer cell mitotic arrest and apoptosis. Therefore, PLK4 might be a valid therapeutic target for antitumor therapy. In the present study, we aimed to determine if YLZ-F5, a potent small-molecule inhibitor of PLK4, inhibits ovarian cancer cell growth.

Methods and results

MTT assay showed that YLZ-F5 inhibited ovarian cancer cell proliferation in a concentration- and time-dependent manner. The results of colony formation assays were consistent with those of the MTT assay results. In addition, YLZ-F5 induced ovarian cancer cell apoptosis that was associated with activation of caspase-3/caspase-9. Moreover, YLZ-F5 caused aberrant in centriole duplication that was associated with the inhibition of PLK4 phosphorylation. Notably, we showed that YLZ-F5 promoted the accumulation of ovarian cancer cells with mitotic defects (> 4 N DNA content) in a concentration-dependent manner. Furthermore, YLZ-F5 markedly inhibited the migration of A2780 cells.

Conclusion

Taken together, these findings suggest that YLZ-F5 is a potential drug candidate for human ovarian cancer.

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Abbreviations

PLK4:

Polo-like kinase 4

MTT:

3-(4,5-Dimethyl-2-thiazolyl)-2,5-di-phenyl-2H-tetrazolium bromide

TCGA:

The Cancer Genome Atlas

NMR:

Nuclear magnetic resonance

ESI–MS:

Electrospray ionisation-mass spectrometry

DMSO:

Dimethyl sulfoxide

PI:

Propidium iodide

DAPI:

2-(4-Amidinophenyl)-6-indolecarbamidine dihydrochloride

7-AAD:

7-Aminoactinomycin D

ECL:

Enhanced chemiluminescence

GEPIA:

Gene expression profiling interactive analyze

FIGO:

International Federation of Gynecology and Obstetrics

PFS:

Progression-free survival

OS:

Overall survival

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Acknowledgements

This research was supported by the China Postdoctoral Science Foundation [Grant number 2019M652543] and Sichuan Provincial Science and technology program for Key research and development, China (No. 2018SZ0007).

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Correspondence to Luoting Yu or Yue Wang.

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Zhu, Y., Liu, Z., Qu, Y. et al. YLZ-F5, a novel polo-like kinase 4 inhibitor, inhibits human ovarian cancer cell growth by inducing apoptosis and mitotic defects. Cancer Chemother Pharmacol 86, 33–43 (2020). https://doi.org/10.1007/s00280-020-04098-w

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