Beta-ionone inhibits colonic aberrant crypt foci formation in rats, suppresses cell growth, and induces retinoid X receptor-alpha in human colon cancer cells

Molecular Cancer Therapeutics
Naveena B JanakiramChinthalapally V Rao

Abstract

Beta-ionone, an end-ring analogue of beta-carotenoid, which is a constituent of vegetables and fruits, has been analyzed for colon cancer chemoprevention and treatment. beta-Ionone induced cell growth inhibition and apoptosis in human colon cancer HCT116 cell line. We tested the in vivo chemopreventive efficacy in rat colon carcinogenesis model using aberrant crypt foci (ACF) as endpoint marker. HCT116 cells treated with subtoxic concentrations of beta-ionone resulted dose-dependent cell growth suppression with G1-S-phase growth arrest and significant induction of apoptosis. beta-Ionone up-regulated expression of retinoid X receptor-alpha mRNA dose-dependently in HCT116 cells. To evaluate inhibitory properties of beta-ionone on colonic ACF, 7-week-old male F344 rats were fed experimental diets containing 0%, 0.1%, or 0.2% beta-ionone. After 1 week, rats received s.c. injections of azoxymethane, 15 mg/kg body weight, once weekly for 2 weeks. Rats were continued on respective experimental diets and sacrificed 8 weeks after the azoxymethane treatment. Colons were evaluated histopathologically for ACF. Administration of dietary 0.1% and 0.2% beta-ionone significantly suppressed total colonic ACF formation up to 34% to 38% (P<0.0002...Continue Reading

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