Lignans from the stems of Sambucus williamsii and their effects on osteoblastic UMR106 cells

Three new lignans, sambucunol A (8) ((+)-erythro-1-(4-hydroxy-3- methoxyphenyl)-2-[4-(4-hydroxy-3-methoxycinnamoyloxypropanyl)-2-hydroxyphenoxy] -1, 3-propanediol), sambucunol B (9) ((+)-threo-1-(4-hydroxyl-3-methoxyphenyl)- 2-[4-(4-hydroxy-3-methoxy-cinnamoyloxy propanyl)-2-hydroxyphenoxy]-1, 3-propanediol) and buddlenol G (10) (2-{4-[2, 3-dihydro-3-hydroxymethyl-7- hydroxy-5-(4-hydroxy-3-methoxycinnamoyloxypropanyl)-2-benzofuranyl]-2, 6-dimethoxyphenoxy}-1-(4- hydroxy-3-methoxyphenyl) -1, 3-propanediol), along with seven known ones, including (-)-syringaresinol (1), (-)-pinoresinol (2), 1, 2-bis(4-hydroxy-3-methoxy phenyl)-1, 3-propanediol (3), (-)-erythro-1-(4- hydroxy-3-methoxyphenyl)-2-[4-(3-hydroxy propanyl)-2-methoxyphenoxy]-1, 3-propanediol (4), (-)-threo-1-(4-hydroxy-3-methoxyphenyl)-2-[4-(3- hydroxypropanyl)-2-methoxy phenoxy]-1, 3-propanediol (5), (-)-lariciresinol (6) and (-)-dihydrodehydrodiconiferyl alcohol (7), were isolated from the 60% ethanol extract of stems of Sambucus williamsii Hance by chromatographic methods. Their structures were established by spectral analysis. The effects of isolated compounds on the osteoblast-like UMR106 cell proliferation and ALP activities were determined. Compounds 2, 7 and 10 showed stimulating effects both on UMR106 cell proliferation and ALP activity. Compounds 1, 3, 6 and 8 stimulated UMR106 cell proliferation, while compounds 4 and 5 induced ALP activity in UMR106 cell.