Abstract:
:To search for possible cancer chemopreventive agents from natural sources, we performed primary screening of metabolites of Alternaria porri by examining their possible inhibitory effects on Epstein-Barr virus early antigen (EBV-EA) activation induced by 12-O-tetradecanoylphorbol-13-acetate (TPA) in Raji cells. The ethyl acetate extract of A. porri showed the inhibitory effect on EBV-EA activation. Three porritoxins (1-3) were obtained as inhibitory active compounds for EBV-EA from ethyl acetate extract. 6-(3',3'-Dimethylallyloxy)-4-methoxy-5-methylphthalide (2) showed the strongest activity among them. Inhibitory effect of porritoxin (1) and (2) was superior to that of beta-carotene, a well-known anti-tumor promoter. Furthermore, the structure-activity correlation of porritoxins and their related compounds were discussed.
journal_name
Nat Prod Resjournal_title
Natural product researchauthors
Horiuchi M,Tokuda H,Ohnishi K,Yamashita M,Nishino H,Maoka Tdoi
10.1080/14786410500046646keywords:
subject
Has Abstractpub_date
2006-02-01 00:00:00pages
161-6issue
2eissn
1478-6419issn
1478-6427pii
Q17V029302431578journal_volume
20pub_type
杂志文章abstract::Methanolic extracts of 18 Thai plants from Doi Tung, the north of Thailand, were examined for brine shrimp lethality and antioxidative activity using 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. In brine shrimp lethality, the highly toxic plant extracts were Mitrephora wangii (LC(50) 14.8 µg mL(-1)) and Hydrocotyle jav...
journal_title:Natural product research
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