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Acetylamine derivative of diospyrin, a plant-derived binaphthylquinonoid, inhibits human colon cancer growth in Nod-Scid mice

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Summary

Anticancer activity of diospyrin and its derivatives (15) was evaluated against thirteen human cell lines. Compared to diospyrin (1), the acetylamine derivative (4) exhibited increase in cytotoxicity, particularly in HT-29 colon cancer cells, showing GI50 values of 33.90 and 1.96 μM, respectively. Also, enhanced toxicity was observed when cells, pre-treated with compound 4, were exposed to radiation. In vivo assessment of 4 was undertaken on tumour-bearing Nod-Scid mice treated at 4 mg/kg/day. Significant reduction in relative tumour volume (~86–91 %) was observed during the 12th–37th days after drug treatment. Increased caspase-3 activity and DNA ladder formation was observed in HT-29 cells after treatment with 4, suggesting induction of apoptotic death after drug treatment. Moreover, flow cytometric determination of Annexin V- FITC positive and PI negative cells demonstrated 17.4, 26.4, and 27.9 % of early apoptosis, respectively, upon treatment with 5, 10 and 25 μM of 4. HT-29 cells after treatment with 4 (1–25 μM) revealed ~2.5- 3- folds generation of ROS. Furthermore, concentration dependent decrease of mitochondrial trans-membrane potential (∆ψm), and expression of Bcl-2/Bax and other marker proteins suggested involvement of mitochondrial pathway of cell death. Overall, our results demonstrated the underlying cell-death mechanism of the plant-derived naphthoquinonoid (4), and established it as a prospective chemotherapeutic ‘lead’ molecule against colon cancer.

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Acknowledgments

The study was funded by the Department of Atomic Energy, Mumbai (Grant No. 2008/37/30/BRNS). SH is funded by a fellowship from the Department of Biotechnology, New Delhi. SG is a recipient of Young Scientist Award, Department of Science and Technology, New Delhi (SERB Grant No. SB/ FT/ LS- 116/ 2012). The authors acknowledge Dr. A.S. Juvekar for organising anticancer drug screening at ACTREC, Mumbai, and Shri Sanjay Shinde for technical assistance in irradiation of samples at BARC, Mumbai.

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The authors declare that they have no conflict of interest.

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Correspondence to B. N. Pandey or Banasri Hazra.

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Sudipta Hazra and Subhalakshmi Ghosh equal contribution

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Hazra, S., Ghosh, S., Kumar, A. et al. Acetylamine derivative of diospyrin, a plant-derived binaphthylquinonoid, inhibits human colon cancer growth in Nod-Scid mice. Invest New Drugs 33, 22–31 (2015). https://doi.org/10.1007/s10637-014-0165-7

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