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Selective induction of DNA damage, G2 abrogation, and mitochondrial apoptosis by leaf extract of traditional medicinal plant Wrightia arborea in K562 cells

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Abstract

Plants have proved to be an important source of anti-cancer drugs. Wrightia arborea, an Indian Ayurvedic medicinal plant, is used traditionally to treat a variety of ailments. This study evaluates the antiproliferative/apoptotic potential of Wrightia arborea leaf extracts, prepared in different organic solvents, on cancer cell lines. MTT assay, light and fluorescence microscopy, flow cytometry, DNA laddering, alkaline comet assay, and western blotting were some of the techniques used for evaluation. Combinations of camptothecin, either with CHK1 inhibitor-PD407824 or with W. arborea leaf extract, were deployed to determine the G2 abrogating potential of the extract. The chloroform extract (WAC) selectively killed K562 cells, without affecting cancerous MCF-7, Hep G2 cells, and normal human peripheral blood lymphocytes. Cell death was characterized by observation of apoptotic bodies, increased Ca2+ and ROS, phosphatidyl serine externalization, mitochondrial membrane depolarization, DNA laddering, increased sub-G1 population, and altered expression of caspase 3, −9, and PARP. WAC also induced DNA damage, alterations in key G2/M phase protein expression, cell cycle perturbation, and potent G2 abrogation. The present study showed that W. arborea leaf extract, WAC, is capable of selectively killing leukemic cancer cells leaving normal lymphocytes unaffected. Our results indicate that this is effectuated through DNA damage and G2 abrogation leading to mitochondrial apoptosis. Taken together, this report contributes toward a better understanding of the anticancer properties of this traditional medicinal plant extract possessing valuable bioactive constituents which can serve as a bioresource for promising complimentary/alternative/chemopreventive therapeutics.

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Acknowledgements

Lakshmipriya T. acknowledges the financial support from University Grants Commission (Govt. of India) for Rajiv Gandhi National Fellowship. The authors thank Dr. Pradeep, Dept. of Botany, University of Calicut, for plant identification; Dr. Santhosh Kumar K., Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, for allowing the use of FACS machine; and Mrs. Indu Ramachandran for technical help with FACS.

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Authors and Affiliations

  1. Department of Biotechnology, University of Calicut, Malappuram, Kerala, 673635, India

    T. Lakshmipriya, T. Soumya & P. R. Manish Kumar

  2. School of Health sciences, University of Calicut, Malappuram, 673635, India

    P. R. Jayasree

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  1. T. Lakshmipriya
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Correspondence to P. R. Manish Kumar.

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Lakshmipriya, T., Soumya, T., Jayasree, P.R. et al. Selective induction of DNA damage, G2 abrogation, and mitochondrial apoptosis by leaf extract of traditional medicinal plant Wrightia arborea in K562 cells. Protoplasma 255, 203–216 (2018). https://doi.org/10.1007/s00709-017-1137-5

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