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Movie S6 from Targeting Polo-like Kinase 1 by a Novel Pyrrole-Imidazole Polyamide–Hoechst Conjugate Suppresses Tumor Growth In Vivo

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posted on 2023-04-03, 15:04 authored by Ke Liu, Lijing Fang, Haiyan Sun, Zhengyin Pan, Jianchao Zhang, Juntao Chen, Ximing Shao, Wei Wang, Yuanyan Tan, Zhihao Ding, Lijiao Ao, Chunlei Wu, Xiaoqi Liu, Huashun Li, Rui Wang, Wu Su, Hongchang Li

Live imaging of mitotic progression in PIP3 treated hTERT-RPE1 cells

Funding

Ministry of Science and Technology of China

National Natural Science Foundation of China

Guangdong Natural Science Foundation

Shenzhen Science and Technology

History

ARTICLE ABSTRACT

The serine/threonine kinase Polo-like kinase 1 (Plk1) plays a pivotal role in cell proliferation and has been validated as a promising anticancer drug target. However, very limited success has been achieved in clinical applications using existing Plk1 inhibitors, due to lack of sufficient specificity toward Plk1. To develop a novel Plk1 inhibitor with high selectivity and efficacy, we designed and synthesized a pyrrole-imidazole polyamide–Hoechst conjugate, PIP3, targeted to specific DNA sequence in the PLK1 promoter. PIP3 could specifically inhibit the cell cycle–regulated Plk1 expression and consequently retard tumor cell growth. Cancer cells treated with PIP3 exhibited severe mitotic defects and increased apoptosis, whereas normal cells were not affected by PIP3 treatment. Furthermore, subcutaneous injection of PIP3 into mice bearing human cancer xenografts induced significant tumor growth suppression with low host toxicity. Therefore, PIP3 exhibits the potential as an effective agent for targeted cancer therapy. Mol Cancer Ther; 17(5); 988–1002. ©2018 AACR.