%0 Journal Article
%T Inhibitory effects of amiodarone on simvastatin metabolism in human liver microsomes<br>
%A Chao Wan
%A Jiang wei Zhang
%A Ning Zhu
%A Ling Yang
%A <br>
%J 老年心脏病学杂志(英文版)
%D 2009
%I Science Press
%X Objective To investigate the effects ofamiodarone (AMD) on simvastatin (SV) in human liver microsomes and the possible underlying mechanisms. Methods Time-, NADPH- and concentration-dependent inhibitions were tested in HLM. The logarithm of relative inhibition values was plotted versus preincubation time (0, 5, 10, 15, 20min) for a series concentration of AMD used (0, 2, 5,25, 50 μ mol/L), and the slopes determined by linear regression. These slope values represente the observed inactivation rate constants (kobs). A double-reciprocal plot was then constructed using the reciprocal of the ko～ (y-axis) and the reciprocal of the associated inhibitor concentration (x-axis) to estimate the values ofkinact and K, which were two principal kinetic constants that were specific for mechanism-based inhibition (MBI).drug-drug interactions (DDI) potential was predicted based on in vitro data and by using the in vitro-in vivo extrapolation. Results The time-, concentration- and NADPH-dependent charactga'istics confirmed that when SV was the substrate of CYP3A4, the inhibition of AMD to CYP3A4 is MBI. Kj and kinact value were calculated to be 5.1 μ mol/L and 0.018min-1 The Clint of SV was reduced 2.96-5.63 fold when it was administrated with AMD. Conclusion Based on the results, AMD would inhibit SV metabolism via the mechanism-based manner, which would lead to DDI when they are taken together. Careful clinical observation is recommended when AMD and SV have to be simultaneously prescribed.
%K amiodarone
%K simvastatin
%K CYP3A4
%K drug-drug interaction
%K mechanism-based inhibition<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=A9DB1C13C87CE289EA38239A9433C9DC&cid=AD36F34DDC3BA7B0&jid=4DC702B3A2386A4814E2FF9CFB799B27&aid=C07E8759223CE5EB1A2FF919248381AB&yid=DE12191FBD62783C&vid=B31275AF3241DB2D&iid=0B39A22176CE99FB&sid=EDA22B444205D04A&eid=7F5DDA4924737DF5&journal_id=1671-5411&journal_name=Journalofgeriatriccardiology:JGC&referenced_num=0&reference_num=20