Mechanism-based Inactivation of Cytochrome P450 3a (cyp3a) by Hiv Protease Inhibitors

نویسندگان

  • C. Steven Ernest
  • Stephen D. Hall
  • David R. Jones
چکیده

256 words Introduction 473 words Discussion – 1238 words d) List of non-standard abbreviations: CYP, cytochrome P450; b5, cytochrome b5; AUC, area under the plasma concentration time curve; ki, reversible inhibition constant; kdeg, rate constant for enzyme degradation; kinact, the maximal rate constant for inactivation; KI, inactivator This article has not been copyedited and formatted. The final version may differ from this version. JPET Fast Forward. Published on November 2, 2004 as DOI: 10.1124/jpet.104.075416 at A PE T Jornals on O cber 9, 2017 jpet.asjournals.org D ow nladed from

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Induction of P-glycoprotein and cytochrome P450 3A by HIV protease inhibitors.

P-Glycoprotein (Pgp) and cytochrome P450 3A (CYP3A) are important enzymes affecting the disposition of HIV protease inhibitors (HIV PIs). After multiple dosing experiments in rats, decreases in the plasma concentrations and area under plasma concentration-time curve (AUC) for HIV PIs have been observed. The purpose of these studies was to determine the changes in Pgp and CYP3A expression and HI...

متن کامل

Complex drug interactions of HIV protease inhibitors 1: inactivation, induction, and inhibition of cytochrome P450 3A by ritonavir or nelfinavir.

Conflicting drug-drug interaction (DDI) studies with the HIV protease inhibitors (PIs) suggest net induction or inhibition of intestinal or hepatic CYP3A. As part of a larger DDI study in healthy volunteers, we determined the effect of extended administration of two PIs, ritonavir (RTV) or nelfinavir (NFV), or the induction-positive control rifampin on intestinal and hepatic CYP3A activity as m...

متن کامل

Mechanism-based inactivation of CYP3A by HIV protease inhibitors.

Human immunodeficiency virus (HIV) protease inhibitors (PIs) are inhibitors of CYP3A enzymes, but the mechanism is poorly defined. In this study, time- and concentration-dependent decreases in activity as defined by maximum rate of inactivation (k(inact)) and inhibitor concentration that gives 50% maximal inactivation (K(I)) of CYP3A by amprenavir, indinavir, lopinavir, nelfinavir, ritonavir, a...

متن کامل

Characterization of Ritonavir-Mediated Inactivation of Cytochrome P450 3A4 s

Ritonavir is a human immunodeficiency virus (HIV) protease inhibitor and an inhibitor of cytochrome P450 3A4, the major human hepatic drug-metabolizing enzyme. Given the potent inhibition of CYP3A4 by ritonavir, subtherapeutic doses of ritonavir are used to increase plasma concentrations of other HIV drugs oxidized by CYP3A4, thereby extending their clinical efficacy. However, the mechanism of ...

متن کامل

Cytochrome P450 enzymes and transporters induced by anti-human immunodeficiency virus protease inhibitors in human hepatocytes: implications for predicting clinical drug interactions.

Although many of the clinically significant drug interactions of the anti-human immunodeficiency virus (HIV) protease inhibitors (PIs) can be explained by their propensity to inactivate CYP3A enzymes, paradoxically these drugs cause (or lack) interactions with CYP3A substrates that cannot be explained by this mechanism (e.g., alprazolam). To better understand these paradoxical interactions (or ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004