The Cytotoxic Cardiac Glycoside (−)-Cryptanoside A from the Stems of Cryptolepis dubia and Its Molecular Targets

Yulin Ren, Elizabeth N. Kaweesa, Lei Tian, Sijin Wu, Kongmany Sydara, Mouachanh Xayvue, Curtis E. Moore, Djaja D. Soejarto, Xiaolin Cheng, Jianhua Yu, Joanna E. Burdette, A. Douglas Kinghorn*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A cardiac glycoside epoxide, (−)-cryptanoside A (1), was isolated from the stems of Cryptolepis dubia collected in Laos, for which the complete structure was confirmed by analysis of its spectroscopic and single-crystal X-ray diffraction data, using copper radiation at a low temperature. This cardiac glycoside epoxide exhibited potent cytotoxicity against several human cancer cell lines tested, including HT-29 colon, MDA-MB-231 breast, OVCAR3 and OVCAR5 ovarian cancer, and MDA-MB-435 melanoma cells, with the IC50 values found to be in the range 0.1-0.5 μM, which is comparable with that observed for digoxin. However, it exhibited less potent activity (IC50 1.1 μM) against FT194 benign/nonmalignant human fallopian tube secretory epithelial cells when compared with digoxin (IC50 0.16 μM), indicating its more selective activity toward human cancer versus benign/nonmalignant cells. (−)-Cryptanoside A (1) also inhibited Na+/K+-ATPase activity and increased the expression of Akt and the p65 subunit of NF-κB but did not show any effects on the expression of PI3K. A molecular docking profile showed that (−)-cryptanoside A (1) binds to Na+/K+-ATPase, and thus 1 may directly target Na+/K+-ATPase to mediate its cancer cell cytotoxicity.

Original languageEnglish
Pages (from-to)1411-1419
Number of pages9
JournalJournal of Natural Products
Issue number6
Publication statusPublished - 23 Jun 2023
Externally publishedYes


Dive into the research topics of 'The Cytotoxic Cardiac Glycoside (−)-Cryptanoside A from the Stems of Cryptolepis dubia and Its Molecular Targets'. Together they form a unique fingerprint.

Cite this