Isogomisin O

Planta Med. 2007 Aug;73(10):1116-26.

Composition and biological activity of different extracts from Schisandra sphenanthera and Schisandra chinensis.[Pubmed: 17611932]

Plants of the Schisandraceae family contain a variety of pharmacologically active lignans like schizandrin, deoxyschizandrin, deangeloylgomisin B, gomisin A, gomisin O, gamma-schizandrin and Isogomisin O.
METHODS AND RESULTS:
Here we have compared the composition of different polar and non-polar extracts of Schisandra sphenanthera and Schisandra chinensis. We also have screened the extracts for antiproliferative and anti-inflammatory effects in different cell-based and cell-free assays. Extracts produced with the non-polar solvents CO(2), hexane and CO(2)/5% ethanol had a similar composition. In contrast, polar extraction with ethanol provided a considerably higher yield, but a lower content of volatiles and lignans in comparison to the non-polar extracts. The proliferation of the epidermal cell lines HaCaT and A431 was dose-dependently inhibited by both the Schisandra sphenanthera and Schisandra chinensis extracts, the non-polar extracts being superior to the polar ones. The non-polar Schisandra sphenanthera extract was the most active with a half-maximal inhibitory concentration of 20 microg/mL. In a cell-free enzyme inhibition assay with recombinant cyclooxygenase-2 (COX-2) the non-polar Schisandra sphenanthera extract dose-dependently inhibited COX-2 catalysed prostaglandin (PG) production (IC(50) = 0.2 microg/mL). It also reduced the ultraviolet-B (UVB)-induced PGE (2) production (IC(50) = 4 microg/mL) and COX-2 expression in HaCaT keratinocytes.
CONCLUSIONS:
We conclude that non-polar SChisandra extracts obtained by CO(2) extraction might be useful in the prevention and treatment of hyperproliferative and inflammatory skin diseases.

Chem Pharm Bull (Tokyo). 2007 Aug;55(8):1281-3.

Lignans from Schisandra propinqua var. propinqua.[Pubmed: 17666862]

METHODS AND RESULTS:
Two new dibenzocyclooctadiene lignans angeloyl-(+)-gomisin K(3) (1) and methylIsogomisin O (2), together with six known ones, Isogomisin O, angeloylIsogomisin O, gomisin O, angeloygomisin O, benzoylgomisin O, epigomisin O, and four 1,4-bis(phenyl)-2,3-dimethylbutane type lignans, pregomisin, meso-dihydroguaiaretic acid, isoanwulignan, and sphenanlignan were isolated from the aerial parts of Schisandra propinqua var. propinqua.
CONCLUSIONS:
The structures of 1 and 2 were elucidated by spectroscopic methods including extensive 1D- and 2D-NMR techniques.