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Novel Tacrine platinum(II) Complexes Display High Anticancer Activity via Inhibition of Telomerase Activity, Dysfunction of Mitochondria, and Activation of the p53 Signaling Pathway

Novel Tacrine platinum(II) Complexes Display High Anticancer Activity via Inhibition of Telomerase Activity, Dysfunction of Mitochondria, and Activation of the p53 Signaling Pathway

Qi-Pin Qin, Shu-Long Wang, Ming-Xiong Tan, Zhen-Feng Wang, Dong-Mei Luo, Bi-Qun Zou, Yan-Cheng Liu, Peng-Fei Yao, Hong Liang

Eur J Med Chem. 2018 Oct 5;158:106-122.

PMID: 30205260

Abstract:

In this work, we designed and synthesized tacrine platinum(II) complexes [PtClL(DMSO)]⋅CH3OH (Pt1), [PtClL(DMP)] (Pt2), [PtClL(DPPTH)] (Pt3), [PtClL(PTH)] (Pt4), [PtClL(PIPTH)] (Pt5), [PtClL(PM)] (Pt6) and [PtClL(en)] (Pt7) with 4,4'-dimethyl-2,2'-bipyridine (DMP), 4,7-diphenyl-1,10-phenanthroline (DPPTH), 1,10-phenanthroline (PTH), 2-(1-pyrenecarboxaldehyde) imidazo [4,5-f]-[1,10] phenanthroline (PIPTH), 2-picolylamine (PM) and 1,2-ethylenediamine (en) as telomerase inhibitors and p53 activators. Biological evaluations demonstrated that Pt1Pt7 exhibited cytotoxic activity against the tested NCIH460, Hep-G2, SK-OV-3, SK-OV-3/DDP and MGC80-3 cancer cell lines, with Pt5 displaying the highest cytotoxicity. Pt5 exhibited an IC50 value of 0.13 ± 0.16 μM against SK-OV-3/DDP cancer cells and significantly reduced tumor growth in a Hep-G2 xenograft mouse model (tumor growth inhibition (TGI) = 40.8%, p < 0.05) at a dose of 15.0 mg/kg. Interestingly, Pt1Pt7 displayed low cytotoxicity against normal HL-7702 cells. Mechanistic studies revealed that these compounds caused cell cycle arrest at the G2/M and S phases, and regulated the expression of CDK2, cyclin A, p21, p53 and p27. Further mechanistic studies showed that Pt5 induced SK-OV3/DDP cell apoptosis via dysfunction of mitochondria, inhibition of the telomerase activity by directly targeting the c-myc promoter, and activation of the p53 signaling pathway. Taken together, Pt5 has the potential to be further developed as a new antitumor drug.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP3029194	1-Pyrenecarboxaldehyde		3029-19-4	Price

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