RT Journal Article SR Electronic T1 INHIBITORY EFFECTS OF FRUIT JUICES ON CYP3A ACTIVITY JF Drug Metabolism and Disposition JO Drug Metab Dispos FD American Society for Pharmacology and Experimental Therapeutics SP 521 OP 523 DO 10.1124/dmd.105.007930 VO 34 IS 4 A1 Kim, Hyunmi A1 Yoon, Yune-Jung A1 Shon, Ji-Hong A1 Cha, In-June A1 Shin, Jae-Gook A1 Liu, Kwang-Hyeon YR 2006 UL http://dmd.aspetjournals.org/content/34/4/521.abstract AB There have been very limited reports on the effects of commercial fruit juices on human CYP3A activity. Therefore, the inhibitory effects of readily available commercial fruit juices on midazolam 1′-hydroxylase activity, a marker of CYP3A, were evaluated in pooled human liver microsomes. The fruit juices investigated were black raspberry, black mulberry, plum, and wild grape. White grapefruit, pomegranate, and orange juice were used as positive and negative controls. The black mulberry juice showed the most potent inhibition of CYP3A except for grapefruit juice. The inhibition depended on the amount of a fruit juice added to the incubation mixture. The inhibitory potential of human CYP3A was in the order: grapefruit > black mulberry > wild grape > pomegranate > black raspberry. The IC50 values of all fruit juices tested were reduced after preincubation with microsomes in the presence of the NADPH-generating system, suggesting that a mechanism-based inhibitory component was present in these fruit juices, as in the case of grapefruit. The results suggest that, like grapefruit juice, commercial fruit juices also have the potential to inhibit CYP3A-catalzyed midazolam 1′-hydroxylation. Therefore, in vivo studies investigating the interactions between fruit juices such as black mulberry and wild grape and CYP3A substrates are necessary to determine whether inhibition of CYP3A activity by fruit juices is clinically relevant. The American Society for Pharmacology and Experimental Therapeutics