Abstract
Background
Several 4,6-diarylpyrimidin-2-amine derivatives show anticancer properties. However, their mode of action is not fully characterized. To develop potent anticancer chemotherapeutic agents, we designed and synthesized 25 4,6-diphenylpyrimidin-2-amine derivatives containing a guanidine moiety.
Methods
Clonogenic long-term survival assays were performed to screen anticancer compounds. To derive the structural conditions showing good cytotoxicities against cancer cells, quantitative structure-activity relationships (QSAR) were calculated. Biological activities were determined by flow cytometry for cell cycle analysis and by immunoblot analysis for the detection of Aurora kinase A (AURKA) activity. Because 2-(2-Amino-6-(2,4-dimethoxyphenyl)pyrimidin-4-yl) phenol (derivative 12) selectively inhibited AURKA activity from the kinome assay, in silico docking experiments were performed to elucidate the molecular binding mode between derivative 12 and AURKA.
Results
The pharmacophores were derived based on the QSAR calculations. Derivative 12 inhibited AURKA activity and reduced phosphorylation of AURKA at Thr283 in HCT116 human colon cancer cells. Derivative 12 caused the accumulation of the G2/M phase of the cell cycle and triggered the cleavages of caspase-3, caspase −7, and poly(ADP-ribose) polymerase. The binding energies of 30 apo-AURKA – derivative 12 complexes obtained from in silico docking ranged from −16.72 to −11.63 kcal/mol.
Conclusions
Derivative 12 is an AURKA inhibitor, which reduces clonogenicity, arrests the cell cycle at the G2/M phase, and induces caspase-mediated apoptotic cell death in HCT116 human colon cancer cells. In silico docking demonstrated that derivative 12 binds to AURKA well. The structure-activity relationship calculations showed hydrophobic substituents and 1-naphthalenyl group at the R2 position increased the activity. The existence of an H-bond acceptor at C-2 of the R1 position increased the activity, too.
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Abbreviations
- AURKA :
-
Aurora kinase A
- AURKB :
-
Aurora kinase B
- AURKC :
-
Aurora kinase C
- CLSA :
-
Clonogenic long-term survival assay
- CoMFA :
-
Comparative molecular field analysis
- CoMSIA :
-
Comparative molecular similarity indices analysis
- GI 50 :
-
Half-maximal growth inhibitory concentrations
- HR/MS :
-
High-resolution mass spectrometry
- PARP :
-
Poly(ADP-ribose) polymerase
- QSAR :
-
Quantitative structure-activity relationships
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Acknowledgments
This work was supported by the Konkuk University Research Support Program (YHL).
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YHL: designed the experiments and wrote the manuscript. JP, YLee, JL, SYS: conducted the experiments. SA: synthesized chemicals. DK and YLim: supervised the study, analyzed the data, and edited the manuscript. All authors read and approved the final manuscript.
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Lee, Y.H., Park, J., Ahn, S. et al. Design, synthesis, and biological evaluation of polyphenols with 4,6-diphenylpyrimidin-2-amine derivatives for inhibition of Aurora kinase A. DARU J Pharm Sci 27, 265–281 (2019). https://doi.org/10.1007/s40199-019-00272-5
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DOI: https://doi.org/10.1007/s40199-019-00272-5