Abstract
The life-threatening potential of lung cancer has increased over the years due to its acquisition of chemotherapeutic resistance, especially to cisplatin, a first-line therapy. In response to this development, researchers have turned their attention to several compounds derived from natural origins, including cypripedin (CYP), a phenanthrenequinone substance extracted from Dendrobium densiflorum. The aim of the present study was to investigate the ability of CYP to induce apoptosis and enhance cisplatin-mediated death of human lung cancer NCI-H460 cells using cell viability and apoptosis assays. The induction of apoptosis by CYP was observed at a concentration of > 50 μM with the appearance of morphological changes, including DNA condensation and chromatin fragmentation. Together with, CYP was able to activate caspase-3 and downregulate the anti-apoptotic proteins Bcl-2 and Bcl-xL. Also, a non-cytotoxic dose of CYP synergistically potentiated the effect of cisplatin in non-small cell lung cancer line H460 cells, which clearly exhibited the apoptotic phenotype. Western blot analysis revealed that the underlying mechanism involved the downregulation of anti-apoptotic Bcl-xL, whereas the levels of other apoptotic regulatory proteins were not altered. This study provides interesting information on the potent effect of CYP as a chemotherapeutic sensitizer that could be further developed to improve the clinical outcomes of lung cancer patients.
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Change history
13 March 2018
In original publication of the article, unfortunately one of the author names was published incorrectly as “Boonchu Sritularuk”. The correct name is “Boonchoo Sritularak”.
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This research was supported by the Ratchadaphiseksomphot Endowment Fund, Chulalongkorn University.
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The original version of this article was revised: One of the author names was published incorrectly as "Boonchu Sritularuk" and the name is corrected in this version.
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Wattanathamsan, O., Treesuwan, S., Sritularak, B. et al. Cypripedin, a phenanthrenequinone from Dendrobium densiflorum, sensitizes non-small cell lung cancer H460 cells to cisplatin-mediated apoptosis. J Nat Med 72, 503–513 (2018). https://doi.org/10.1007/s11418-018-1176-z
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DOI: https://doi.org/10.1007/s11418-018-1176-z