| Title: | Effects of feeding Artemisia filifolia and Helenium flexuosum on rabbit cytochrome P450 isozymes |
| Author(s): | Eissa FZ; Qualls CW; Burrows GE; Lish JW; |
| Address: | "Oklahoma Animal Disease Diagnostic Laboratory, USA" |
| ISSN/ISBN: | 0145-6296 (Print) 0145-6296 (Linking) |
| Abstract: | "Six groups of 4 rabbits each were treated as follows: Control; phenobarbital (PB); 3-methylcholanthrene (3MC); proadifen hydrochloride (SKF-525A); Artemisia filifolia and Helenium flexuosum. Prototype P450 inducers (PB and 3MC) increased basal hepatic cytochrome P450 content by 2-3 fold whereas the P450 inhibitor (SKF-525A) had no effect on basal cytochrome P450 content. PB-induction of hepatic microsomes significantly increased the rate of dealkylation of long alkyl chain alkoxyresorufin ethers, benzyloxyresorufin and pentoxyresorufin 47-fold and 17-fold, respectively, but had little or no effect on short alkyl chains. 3MC-induction of microsomes increased dealkylation of all alkoxyresorufin ethers tested, preferentially dealkylating ethers with short alkyl chain in the order: methoxy > ethoxy > propoxy. Artemisia filifolia or Helenium flexuosum had no effect on basal hepatic cytochrome P450 content. However, microsomal dealkylation activity of short alkyl chain alkoxyresorufin ethers (methoxy, ethoxy and propoxy) was inhibited approximately 50%. When these plants are eaten for several days, they may inhibit biotransformation processes in herbivores through the same isoenzymes induced by 3MC" |
| Keywords: | Animal Feed Animals *Artemisia Biotransformation/drug effects Cytochrome P-450 Enzyme System/drug effects/*metabolism Enzyme Induction/drug effects Enzyme Inhibitors/administration & dosage/*toxicity Isoenzymes/drug effects/*metabolism Liver/drug effects/; |
| Notes: | "MedlineEissa, F Z Qualls, C W Jr Burrows, G E Lish, J W eng 1996/02/01 Vet Hum Toxicol. 1996 Feb; 38(1):19-23" |
