Auraptene, a coumarin-related compound, has been isolated from the cold-pressed oil of natsumikan (Citrus natsudaidai HAYATA), as an inhibitor of 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced Epstein-Barr virus (EBV) activation in Raji cells. In a two-stage carcinogenesis experiment with 1.6 nmol of TPA and 0.19 μmol of 7,12-dimethyl benz[a]anthracene (DMBA) in ICR mouse skin, topical application of 160 nmol of auraptene significantly reduced tumor incidence and the number of tumors per mouse by 27% and 23%, respectively. Auraptene at 50 μM almost completely suppressed TPA-induced superoxide (O2-)and hydroperoxide (ROOH) generation in differentiated HL-60 cells as well as lypopolysaccharide (LPS)/interferon-γ(IFN-γ)-induced nitric oxide (NO) generation in RAW 264.7 cells. Dietary feeding of auraptene at a dose of 100 or 500 ppm inhibited azoxymethane (AOM)-induced rat colonic aberrant crypt foci (ACF) formation in a dose-dependent manner. Oral administration of auraptene (50 - 200 mg/kg body wt.) clearly enhanced the glutathione S-transferase (GST) activity in mouse liver, suggesting that auraptene is an effective chemopreventer in both tumor initiation and promotion phases.
|Number of pages||10|
|Journal||ACS Symposium Series|
|Publication status||Published - Dec 1 1998|
ASJC Scopus subject areas
- Chemical Engineering(all)