Title:The In Vitro Anti-Cancer Activities of 17βH-Neriifolin Isolated from Cerbera odollam and its Binding Activity on Na+, K+-ATPase
Volume: 21
Issue: 1
Author(s): Nurhanan M. Yunos*, Asiah Osman, Muhammad H. Jauri, Nor J. Sallehudin and Siti Syarifah Mohd Mutalip
Affiliation:
- Bioactivity Programme, Natural Products Division, Forest Research Institute Malaysia, 52109, Kepong Selangor,Malaysia
Keywords:
17βH-neriifolin, cardiac glycoside, anti-cancer, apoptosis, Na+, K+-ATPase, ouabain.
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.