title: Interiotherins C and D, two new lignans from Kadsura interior and antitumor-promoting effects of related neolignans on Epstein-Barr virus activation.
abstract: Two new lignans, interiotherins C (1) and D (2), together with the known compounds interiorin (3), heteroclitin F (4), neokadsuranin (5), heteroclitin D (6), kadsurin (7), gomisin A (8), schisandrin C (9), interiotherin A (10), angeloylgomisin R (11), gomisin G (12), interiotherin B (13), and gomisin C (14), were isolated from the stems of Kadsura interior. The structures and stereochemistries of the new compounds were determined from mass, CD, and NMR spectral data. Fourteen neolignans were screened as potential antitumor promoters by examining their ability to inhibit Epstein-Barr virus early antigen (EBV-EA) activation (induced by 12-O-tetradecanoylphorbol-13-acetate) in Raji cells. Neokadsuranin (5) and schisandrin C (9) were the most potent compounds. These data suggest that some neolignans might be valuable antitumor promoters or chemopreventors.
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000998:Antiviral Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002681:China; D002942:Circular Dichroism; D034242:Cyclooctanes; D004149:Dioxoles / Q000494:pharmacology; D004854:Herpesvirus 4, Human / Q000187:drug effects; D032135:Kadsura / Q000737:chemistry*; D017705:Lignans / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D008214:Lymphocytes / Q000187:drug effects / Q000821:virology; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D024301:Plant Bark / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D014407:Tumor Cells, Cultured / Q000187:drug effects; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D000998:Antiviral Agents; D034242:Cyclooctanes; D004149:Dioxoles; D017705:Lignans; C470170:interiotherin C; C470171:interiotherin D; C082093:schisantherin D