Artemiprincepsolides A—F, Novel Germacrane‐guaiane and Eudesmane‐guaiane Sesquiterpenoid Dimers from Artemisia princeps and Their Antihepatoma Activity.

Comprehensive Summary: Artemiprincepsolides A—F (1—6) were isolated from Artemisia princeps guided by bioactivity and elucidated by comprehensive spectral data and ECD calculation. Compounds 1—3 represented the first connecting model of germacrane‐guaiane hetero‐dimeric adducts, and compounds 4—6 were eudesmane‐guaiane hetero‐coupled sesquiterpenoid dimers, meanwhile, all these were presumably formed by Diels‐Alder cycloaddition. Compounds 1—6 were evaluated for their hepatomatic cytotoxicity on three hepatoma cell lines, and demonstrated cytotoxicity with IC50 values in the range of 5.0—67.3 μmol/L. Interestingly, compound 1 manifested significant cytotoxicity against HepG2, Huh7, and SK‐Hep‐1 cells with IC50 values of 9.9, 9.2, and 5.0 μmol/L, which were almost equivalent to the positive control, sorafenib. Flow cytometry data and Western blot assays revealed the most active compound 1 dose‐dependently inhibited cell migration and invasion, and significantly induced HepG2 cells arrest in G2/M phase by downregulating proteins pcdc2 and upregulating the level of protein CyclinB1; and induced apoptosis by downregulating of Bcl‐2 expression and upregulating Bax level. [ABSTRACT FROM AUTHOR]