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Current Pharmaceutical Biotechnology

Author(s): Nurhanan M. Yunos*, Asiah Osman, Muhammad H. Jauri, Nor J. Sallehudin and Siti Syarifah Mohd Mutalip

DOI: 10.2174/1389201020666190917154850

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The In Vitro Anti-Cancer Activities of 17βH-Neriifolin Isolated from Cerbera odollam and its Binding Activity on Na+, K+-ATPase

Page: [37 - 44] Pages: 8

  • * (Excluding Mailing and Handling)

Abstract

Background: 17βH-neriifolin, a cardiac glycoside compound had been successfully isolated from Cerbera odollam leaves based on the bioassay guided-isolation procedure. The aim of these studies were to determine the in vitro anti-cancer and binding effects of 17βH-neriifolin on Na+, K+-ATPase.

Methods: The in vitro anti-cancer effects were evaluated using Sulphorhodamine B and Hoescht 33342 assays. The Na+, K+-ATPase assay was carried out using Malachite Green assay. In silico molecular docking studies and in vitro malachite green assay were used to predict the binding activities of 17βH-neriifolin on Na+, K+-ATPase and ouabain was also included as for comparison studies.

Results: The compound was tested against breast (MCF-7, T47D), colorectal (HT-29), ovarian (A2780, SKOV-3) and skin (A375) cancer cell lines that gave IC50 values ranged from 0.022 ± 0.0015 to 0.030 ± 0.0018 μM. The mechanism of cell death of 17βH-neriifolin was further evaluated using Hoescht 33342 assay and it was found that the compound killed the cancer cells via apoptosis. 17βHneriifolin and ouabain both bound at α-subunit in Na+, K+-ATPase and their binding energy were - 8.16 ± 0.74 kcal/mol and -8.18 ± 0.48 kcal/mol respectively.

Conclusion: The results had confirmed the anti-proliferative effects exerted by 17βH-neriifolin in the breast, colorectal, ovarian and skin cancer cell lines. 17βH-neriifolin had shown to cause apoptotic cell death in the respective cancer cell lines.17βH-neriifolin and ouabain both bound at α-subunit in Na+, K+-ATPase and their binding energy were -8.16 ± 0.74 kcal/mol and -8.18 ± 0.48 kcal/mol respectively. This is the first report to reveal that 17βH-neriifolin managed to bind to the pocket of α-subunit of Na+.K+-ATPase.

Keywords: 17βH-neriifolin, cardiac glycoside, anti-cancer, apoptosis, Na+, K+-ATPase, ouabain.

Graphical Abstract

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