Abstract
Background: Pyrimidine-5-carbonitrile has a broad spectrum of biological activities such as antiviral, antioxidant, and anticancer activities. Among similar compounds, monastrol is the most prominent cell-permeant inhibitor of mitosis; therefore, we investigated the new Pyrimidine-5-carbonitrile as a cytotoxic agent for the p53 pathway.
Objective: Several new benzyloxyphenyl pyrimidine-5-carbonitrile derivatives were designed, synthesized, and characterized, and their cytotoxicity was evaluated. The most active compounds were tested for their activity against p53 as a mechanistic target for antiproliferative action.
Methods: The key intermediate tetrahydropyrimidine-5-carbonitrile derivative 4 was prepared by a multicomponent reaction (MCR) of the Biginelli type. S-alkylation of the key intermediate with the required alkyl or aralkyl halides or refluxing 4 with POCl3 followed by an amino acid yielded the target compounds. The cytotoxicity of 5c-e, 7a-c, 9, 10a, b, and 11 was evaluated using the A549 cell line of human lung adenocarcinoma, HepG2 liver cell line, and MDAMB- 231 cell line of breast cancer using the MTT assay. The transcription effects of 7a, 7c, and 11 on the p53 were assessed and compared with the reference doxorubicin.
Results: Compounds 7a, 7c, and 11 have the highest cytotoxic effect when applied to most cancer cells. The tested compounds with 5-FU showed a significant increase in the anticancer activity more than 5-FU alone. Compounds 7a, 7c, and 11 increased the level of active caspase 3 by 4-6-fold compared to untreated control cells in the human liver cancer cell line (HepG2). Compounds 7a, 7c, and 11 increased the levels of caspase 8 and 9, indicating activation of both intrinsic and extrinsic pathways and showing potent induction of Bax, down-regulation of Bcl-2 protein levels, and over-expression of Cytochrome C levels in HepG2 cell lines. Compound 11 exhibited cell cycle arrest at the Pre- G1 and G2/M phases in the cell cycle analysis of the HepG2 cell line. The results revealed an increase of 12.40-19.10 in p53 level compared to the test cells and that p53 protein level of 7a, 7c, and 11 was significantly inductive (636, 861, and 987 pg/mL, respectively) in relation to doxorubicin (1263 pg/mL).
Conclusion: Pyrimidine-5-carbonitrile derivatives have potent apoptotic and antiproliferative properties.
Keywords: Dihydropyrimidinone, antiproliferative, caspases, cytochrome c, BAX, p53.
Graphical Abstract
[http://dx.doi.org/10.1016/j.ejmech.2017.03.025] [PMID: 28342939]
[http://dx.doi.org/10.1016/j.bmcl.2014.11.060] [PMID: 25529736]
[http://dx.doi.org/10.1002/jbt.20424] [PMID: 22447704]
[http://dx.doi.org/10.1016/j.ejmech.2006.01.007] [PMID: 16516351]
[http://dx.doi.org/10.1126/science.286.5441.971] [PMID: 10542155]
[http://dx.doi.org/10.1016/j.bioorg.2006.04.003] [PMID: 16765411]
[http://dx.doi.org/10.1002/cbic.200500005] [PMID: 15912555]
[http://dx.doi.org/10.1016/j.tet.2014.11.039]
[http://dx.doi.org/10.1016/j.ejmech.2017.06.026] [PMID: 28667871]
[http://dx.doi.org/10.1093/jnci/82.13.1107] [PMID: 2359136]
[http://dx.doi.org/10.3390/molecules200916852] [PMID: 26389876]
[http://dx.doi.org/10.1016/j.ejmech.2016.09.023] [PMID: 27662031]
[http://dx.doi.org/10.1038/nature09535] [PMID: 21107428]
[http://dx.doi.org/10.21037/tcr.2016.11.45]
[http://dx.doi.org/10.1093/carcin/bgl214] [PMID: 17088261]
[http://dx.doi.org/10.1016/j.cell.2013.03.020] [PMID: 23562644]
[http://dx.doi.org/10.1038/nature14344] [PMID: 25799988]
[http://dx.doi.org/10.3164/jcbn.11-004FR] [PMID: 21297918]
[http://dx.doi.org/10.1371/journal.pone.0141370] [PMID: 26491966]
[http://dx.doi.org/10.1016/j.ejmech.2009.04.020] [PMID: 19447526]
[http://dx.doi.org/10.1016/j.bioorg.2019.102997] [PMID: 31136902]
[http://dx.doi.org/10.1016/j.ejmech.2019.05.015] [PMID: 31108261]
[http://dx.doi.org/10.1016/j.bioorg.2017.09.009] [PMID: 28938224]
[http://dx.doi.org/10.1016/j.ejmech.2018.01.042] [PMID: 29407956]
[http://dx.doi.org/10.1016/j.ejmech.2019.05.040] [PMID: 31128433]
[PMID: 30500087 ]
[http://dx.doi.org/10.1016/j.bioorg.2018.06.003] [PMID: 29920422]
[http://dx.doi.org/10.1111/cbdd.12928] [PMID: 28019082]
[http://dx.doi.org/10.1016/S0344-0338(96)80088-4] [PMID: 8880867]
[http://dx.doi.org/10.1016/j.bmc.2014.11.017] [PMID: 25498235]
[http://dx.doi.org/10.1002/med.21418] [PMID: 27879006]
[http://dx.doi.org/10.1042/bj3260001] [PMID: 9337844]
[http://dx.doi.org/10.1074/jbc.M008363200] [PMID: 11058599]