EFFECT OF DIETARY CAFFEIC AND CHLOROGENIC ACIDS ON IN-VIVO XENOBIOTICENZYME-SYSTEMS

The plant phenols chlorogenic and caffeic acids were tested for their affinity to alter hepatic and intestinal xenobiotic Phase I and Phase II enzyme activities in mice. Mice were fed isocaloric and isonitrogen ous powdered diets containing 0 and 0.2% caffeic and chlorogenic acids , respectively. Animals pre-treated with benzo(a)pyrene (B(a)P) were s acrificed 18 h after an oral dose (50 mg/kg Bwt). B(a)P induced animal s exhibited higher (p < 0.05) microsomal AHH, UDPGT, P-450 and cytosol ic GST liver enzyme activities. The presence of these phenolics in the diet was shown to have little effect in modulating hepatic xenobiotic activating-detoxification enzymes. The dietary intake of caffeic and chlorogenic acids was particularly evident with intestinal xenobiotic AHH and GST enzyme activity. These data indicate that the presence of caffeic and chlorogenic acids in the diet may have an integral role in modulating the carcinogenic potential of reactive xenobiotics such as B(a)P.