Abstract
Plants are major source for discovery and development of anticancer drugs. Several plant-based anticancer drugs are currently in clinical use. Fagonia indica is a plant of medicinal value in the South Asian countries. Using mass spectrometry and NMR spectroscopy, several compounds were purified from the F. indica extract. We have used one of the purified compounds quinovic acid (QA) and found that QA strongly suppressed the growth and viability of human breast and lung cancer cells. QA did not inhibit growth and viability of non-tumorigenic breast cells. QA mediated its anticancer effects by inducing cell death. QA-induced cell death was associated with biochemical features of apoptosis such as activation of caspases 3 and 8 as well as PARP cleavage. QA also upregulated mRNA and protein levels of death receptor 5 (DR5). Further investigation revealed that QA did not alter DR5 gene promoter activity, but enhanced DR5 mRNA and protein stabilities. DR5 is one of the major components of the extrinsic pathway of apoptosis. Accordingly, Apo2L/TRAIL, the DR5 ligand, potentiated the anticancer effects of QA. Our results indicate that QA mediates its anticancer effects, at least in part, by engaging DR5-depentent pathway to induce apoptosis. Based on our results, we propose that QA in combination with Apo2L/TRAIL can be further investigated as a novel therapeutic approach for breast and lung cancers.
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Acknowledgements
We thank Dr. Wafik el-Deiry (Brown University) for providing DR5 promoter-luciferase construct. Asma Umer Khayam was supported by a fellowship from Higher Education Commission, Islamabad, Pakistan. This work was supported, in part, by the Carol M. Baldwin Breast Cancer Research Fund and Michael E. Connolly Endowment for Lung Cancer Research, Upstate Cancer Center grant to Dr. M. Saeed Sheikh.
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AUK: Conceptualization; Investigation; Methodology; Validation; Writing—original draft; Writing—review & editing. HP: Investigation; Methodology; Validation; Writing—review & editing. NAF: Methodology; Validation; Writing—review & editing. AEFM: Methodology; Validation; Writing—review & editing. ED: Methodology; Validation; Writing—review & editing. BM: Resources; Supervision; Writing—review & editing. YH: Resources; Supervision; Writing—review & editing. MSS: Conceptualization; Investigation; Funding acquisition; Project administration; Resources; Supervision; Writing—original draft; Writing—review & editing.
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11010_2020_3841_MOESM1_ESM.tif
Supplementary file1 Supplementary Figure 1 QA does not regulate DR5 gene promoter. (A) Schematic of DR5 gene promoter luciferase construct used in this study. (B) QA effect on DR5 promoter activity in A549 lung cancer cells. QA does not upregulate DR5 promoter. In the same experiments, cells were separately treated with thapsigargin (TG), used as a positive control that is known to upregulate DR5 promoter activity. As expected, TG upregulates DR5 promoter activity. QA or TG treatment was for 24 hours. (C) QA does not upregulate DR5 promoter activity in MCF-7 human breast cancer cells. Cells were transiently transfected with DR5 promoter luciferase construct. After ~24 hours, cells were treated with QA or vehicle control for the indicated periods of time. Relative luciferase activity was calculated and plotted as fold induction. The values are presented as mean ± SEM of three independent measurements. (TIF 69 kb)
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Khayam, A.U., Patel, H., Faiola, N.A. et al. Quinovic acid purified from medicinal plant Fagonia indica mediates anticancer effects via death receptor 5. Mol Cell Biochem 474, 159–169 (2020). https://doi.org/10.1007/s11010-020-03841-4
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DOI: https://doi.org/10.1007/s11010-020-03841-4