Inhibition of human cytochrome P450 enzymes by the natural hepatotoxin safrole.

@article{citeulike:1445338, abstract = {The hepatotoxin, safrole is a methylenedioxy phenyl compound, found in sassafras oil and certain other essential oils. Recombinant cytochrome P450 (CYP, P450) and human liver microsomes were studied to investigate the selective inhibitory effects of safrole on human P450 enzymes and the mechanisms of action. Using Escherichia coli-expressed human P450, our results demonstrated that safrole was a non-selective inhibitor of CYP1A2, CYP2A6, CYP2D6, CYP2E1, and CYP3A4 in the IC(50) order CYP2E1 < CYP1A2 < CYP2A6 < CYP3A4 < CYP2D6. Safrole strongly inhibited CYP1A2, CYP2A6, and CYP2E1 activities with IC(50) values less than 20 microM. Safrole caused competitive, non-competitive, and non-competitive inhibition of CYP1A2, CYP2A6 and CYP2E1 activities, respectively. The inhibitor constants were in the order CYP1A2 < CYP2E1 < CYP2A6. In human liver microsomes, 50 microM safrole strongly inhibited 7-ethoxyresorufin O-deethylation, coumarin hydroxylation, and chlorzoxazone hydroxylation activities. These results revealed that safrole was a potent inhibitor of human CYP1A2, CYP2A6, and CYP2E1. With relatively less potency, CYP2D6 and CYP3A4 were also inhibited.}, address = {National Research Institute of Chinese Medicine, 155-1, Li-Nong Street, Sec. 2, Taipei 112, Taiwan, ROC. ueng@nricm.edu.tw}, author = {Ueng, Y. F. and Hsieh, C. H. and Don, M. J. }, citeulike-article-id = {1445338}, doi = {10.1016/j.fct.2005.01.008}, issn = {0278-6915}, journal = {Food Chem Toxicol}, keywords = {betel, cyp450}, month = {May}, number = {5}, pages = {707--712}, posted-at = {2007-07-10 05:38:31}, priority = {2}, title = {Inhibition of human cytochrome P450 enzymes by the natural hepatotoxin safrole.}, url = {http://dx.doi.org/10.1016/j.fct.2005.01.008}, volume = {43}, year = {2005} }

TY - JOUR ID - citeulike:1445338 L3 - citeulike-article-id:1445338 TI - Inhibition of human cytochrome P450 enzymes by the natural hepatotoxin safrole. JF - Food Chem Toxicol VL - 43 IS - 5 SP - 707 EP - 712 AD - National Research Institute of Chinese Medicine, 155-1, Li-Nong Street, Sec. 2, Taipei 112, Taiwan, ROC. ueng@nricm.edu.tw SN - 0278-6915 N2 - The hepatotoxin, safrole is a methylenedioxy phenyl compound, found in sassafras oil and certain other essential oils. Recombinant cytochrome P450 (CYP, P450) and human liver microsomes were studied to investigate the selective inhibitory effects of safrole on human P450 enzymes and the mechanisms of action. Using Escherichia coli-expressed human P450, our results demonstrated that safrole was a non-selective inhibitor of CYP1A2, CYP2A6, CYP2D6, CYP2E1, and CYP3A4 in the IC(50) order CYP2E1 < CYP1A2 < CYP2A6 < CYP3A4 < CYP2D6. Safrole strongly inhibited CYP1A2, CYP2A6, and CYP2E1 activities with IC(50) values less than 20 microM. Safrole caused competitive, non-competitive, and non-competitive inhibition of CYP1A2, CYP2A6 and CYP2E1 activities, respectively. The inhibitor constants were in the order CYP1A2 < CYP2E1 < CYP2A6. In human liver microsomes, 50 microM safrole strongly inhibited 7-ethoxyresorufin O-deethylation, coumarin hydroxylation, and chlorzoxazone hydroxylation activities. These results revealed that safrole was a potent inhibitor of human CYP1A2, CYP2A6, and CYP2E1. With relatively less potency, CYP2D6 and CYP3A4 were also inhibited. KW - betel KW - cyp450 AU - Ueng, YF AU - Hsieh, CH AU - Don, MJ PY - 2005/05// UR - http://dx.doi.org/10.1016/j.fct.2005.01.008 ER -