Metabolic disposition of lansoprazole in relation to the S-mephenytoin 4'-hydroxylation phenotype status. Export

@article{citeulike:5272973, abstract = {OBJECTIVE: To assess the possible involvement of CYP2C19 in the metabolism of lansoprazole in vivo. METHODS: Sixteen male Korean subjects, who had been phenotyped as extensive metabolizers and poor metabolizers of S-mephenytoin 4'-hydroxylation polymorphism (n = 8 each) with racemic mephenytoin with use of the 8-hour urine analysis of 4'-hydroxymephenytoin, took an oral dose of 30 mg lansoprazole, and blood samples were collected up to 48 hours after dosing. Lansoprazole and its metabolites were measured by high-performance liquid chromatography with ultraviolet detection. RESULTS: The mean lansoprazole area under the concentration-time curve (AUC), elimination half-life (t1/2), and apparent oral clearance (CLoral) were significantly (p < 0.001) greater, longer, and lower, respectively, in the poor metabolizer than in the extensive metabolizer group. The mean values for the AUC of hydroxylansoprazole and AUC ratio of hydroxylansoprazole to lansoprazole were significantly (p < 0.01 to p < 0.001) less in the poor metabolizer than in the extensive metabolizer group, whereas those for the AUC of lansoprazole sulfone and ratio of lansoprazole sulfone to lansoprazole were greater (p < 0.001) in the former than in the latter group. In addition, the log10 4'-hydroxymephenytoin excreted in urine correlated significantly (p < 0.01) with the CLoral of lansoprazole. CONCLUSIONS: These results suggest that the hydroxylation of lansoprazole cosegregates with the genetically determined S-mephenytoin 4'-hydroxylation (CYP2C19) polymorphism in the Korean subjects.}, author = {Sohn, D. R. and Kwon, J. T. and Kim, H. K. and Ishizaki, T.}, citeulike-article-id = {5272973}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/S0009-9236(97)90137-5}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/9164419}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=9164419}, doi = {10.1016/S0009-9236(97)90137-5}, issn = {0009-9236}, journal = {Clinical pharmacology and therapeutics}, keywords = {cyp2c19, korea, nnn}, month = {May}, number = {5}, pages = {574--582}, posted-at = {2009-07-26 18:14:00}, priority = {2}, title = {Metabolic disposition of lansoprazole in relation to the S-mephenytoin 4'-hydroxylation phenotype status.}, url = {http://dx.doi.org/10.1016/S0009-9236(97)90137-5}, volume = {61}, year = {1997} }

TY - JOUR ID - citeulike:5272973 L3 - citeulike-article-id:5272973 N2 - OBJECTIVE: To assess the possible involvement of CYP2C19 in the metabolism of lansoprazole in vivo. METHODS: Sixteen male Korean subjects, who had been phenotyped as extensive metabolizers and poor metabolizers of S-mephenytoin 4'-hydroxylation polymorphism (n = 8 each) with racemic mephenytoin with use of the 8-hour urine analysis of 4'-hydroxymephenytoin, took an oral dose of 30 mg lansoprazole, and blood samples were collected up to 48 hours after dosing. Lansoprazole and its metabolites were measured by high-performance liquid chromatography with ultraviolet detection. RESULTS: The mean lansoprazole area under the concentration-time curve (AUC), elimination half-life (t1/2), and apparent oral clearance (CLoral) were significantly (p < 0.001) greater, longer, and lower, respectively, in the poor metabolizer than in the extensive metabolizer group. The mean values for the AUC of hydroxylansoprazole and AUC ratio of hydroxylansoprazole to lansoprazole were significantly (p < 0.01 to p < 0.001) less in the poor metabolizer than in the extensive metabolizer group, whereas those for the AUC of lansoprazole sulfone and ratio of lansoprazole sulfone to lansoprazole were greater (p < 0.001) in the former than in the latter group. In addition, the log10 4'-hydroxymephenytoin excreted in urine correlated significantly (p < 0.01) with the CLoral of lansoprazole. CONCLUSIONS: These results suggest that the hydroxylation of lansoprazole cosegregates with the genetically determined S-mephenytoin 4'-hydroxylation (CYP2C19) polymorphism in the Korean subjects. IS - 5 JF - Clinical pharmacology and therapeutics SN - 0009-9236 EP - 582 TI - Metabolic disposition of lansoprazole in relation to the S-mephenytoin 4'-hydroxylation phenotype status. VL - 61 SP - 574 KW - cyp2c19 KW - korea KW - nnn AU - Sohn, DR AU - Kwon, JT AU - Kim, HK AU - Ishizaki, T PY - 1997/05// UR - http://dx.doi.org/10.1016/S0009-9236(97)90137-5 ER -