New lanostanoids from the fungus Ganoderma concinna

Abstract

Three new compounds, 5alpha-lanosta-7,9(11),24-triene-3,8-hydroxy-26-al (1), 5alpha-lanosta-7,9(11),24-triene-15alpha-26-dihydroxy-3-one (2), and 8alpha,9alpha-epoxy-4,4,14alpha-trimethyl-3,7,11,15,20-pentaoxo-5alpha-pregnane (3), were isolated from Ganoderma concinna along with 12 known compounds. The structures of compounds I and 2 were determined on the basis of MS and NMR studies. The structure of 3 was determined by MS, NMR, and single-crystal X-ray diffraction. Compounds 1, 2, and 3 induce apoptosis in human promyelocytic leukemia HL-60 cells, as indicated by examining the morphological features of cells and detection of DNA fragmentation by gel electrophoresis.