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DOI: 10.1055/s-0042-106168
Unusual Cytotoxic Steroidal Saponins from the Gorgonian Astrogorgia dumbea
Publikationsverlauf
received 09. September 2015
revised 11. März 2016
accepted 22. März 2016
Publikationsdatum:
28. Juni 2016 (online)
![](https://www.thieme-connect.de/media/plantamedica/20160910/lookinside/thumbnails/10-1055-s-0042-106168_pmz0896-1.jpg)
Abstract
Three steroidal saponins, including astrogorgiosides A (1) and B (2) bearing acetamido-glucose moieties, and astrogorgioside C (3) with a 19-nor and bearing an aromatized B ring steroid aglycone, together with a known major saponin dimorphoside A (4), were obtained from the gorgonian Astrogorgia dumbea collected near Dongshan Island in East China Sea. Structures of these compounds were elucidated by in-depth spectral and chemical methods, including 2D-NMR, HR-ESI-MS spectra, and acidic hydrolysis. For the first time, acetamido-glucose moiety is being reported from a gorgonian. The B-ring aromatized steroid aglycone of compound 3 is also rare in marine natural products. Compounds 1–3 exhibited moderate cytotoxic activity with IC50 values of 26.8–45.6 µM against human tumor cells Bel-7402 and K562.
Key words
Astrogorgia dumbea - Plexauridae - steroidal saponin - astrogorgiosides A–C - cytotoxic activity-
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