| Summary: | Two new natural compounds, sulfated polyhydroxysteroid, microdiscusol G ( 1 ), and polyhydroxysteroid bioside, microdiscusoside A ( 2 ), along with eight previously known polar steroid substances 3–10 , were isolated from the Arctic starfish Asterias microdiscus . The structures of 1 and 2 have been elucidated by extensive 1D and 2D NMR spectroscopy and HRESIMS techniques. The 28-sulfooxy-24-methylcholestane side chain in 1 has been found among starfish steroid metabolites for the first time. Steroid saponins 9 and 10 exhibited cytotoxic effects against normal cells JB6 Cl41 and cancer cells HT-29, MDA-MB-231, THP-1, and Raji and effectively suppressed cell proliferation and colony formation of cancer cells HT-29 and MDA-MB-231 in non-toxic concentrations. Compounds 5 , 7 , and 8 were inactive or less active in the same experiments.
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