Universität zu Köln

Tomalik-Scharte, Dorota, Suleiman, Ahmed Abbas, Frechen, Sebastian, Kraus, Daria, Kerkweg, Uta, Rokitta, Dennis, Di Gion, Paola, Queckenberg, Christian and Fuhr, Uwe (2014). Population Pharmacokinetic Analysis of Circadian Rhythms in Hepatic CYP3A Activity Using Midazolam. J. Clin. Pharmacol., 54 (10). S. 1162 - 1170. HOBOKEN: WILEY-BLACKWELL. ISSN 1552-4604

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Abstract

Diurnal changes in the activity of drug metabolizing enzymes may contribute to the variability in drug disposition and drug effects. The aim of this study was to quantify the circadian rhythmicity exhibited by hepatic CYP3A. A 10g/kg intravenous bolus dose, followed by a 30-hour 4g/kg/h intravenous infusion of midazolam, used as a probe substrate for hepatic CYP3A activity, was administered to 16 healthy volunteers (8 males and 8 females). Blood samples were drawn hourly for 24hours after achieving steady state, and plasma concentrations of midazolam and its main metabolite 1-OH midazolam were determined. Population pharmacokinetic analysis was performed using nonlinear mixed effects modeling. One-compartment pharmacokinetic models best described midazolam and 1-OH midazolam pharmacokinetic disposition. An unequivocal but minor diurnal pattern was identified in the midazolam plasma concentration profiles, which was described using a cosine function with a 24-hours period. The fluctuation in the relative CYP3A activity ranged between 10% above average around 15:00, and 10% below average around 03:00. None of the covariates tested had a significant impact on the parameters estimated. Although a diurnal pattern in hepatic CYP3A activity was identified, its magnitude suggests that it is small and without clinical significance for drug therapy.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tomalik-Scharte, Dorota UNSPECIFIED UNSPECIFIED UNSPECIFIED Suleiman, Ahmed Abbas UNSPECIFIED UNSPECIFIED UNSPECIFIED Frechen, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Kraus, Daria UNSPECIFIED UNSPECIFIED UNSPECIFIED Kerkweg, Uta UNSPECIFIED UNSPECIFIED UNSPECIFIED Rokitta, Dennis UNSPECIFIED UNSPECIFIED UNSPECIFIED Di Gion, Paola UNSPECIFIED UNSPECIFIED UNSPECIFIED Queckenberg, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Fuhr, Uwe UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-427769
DOI:	10.1002/jcph.318
Journal or Publication Title:	J. Clin. Pharmacol.
Volume:	54
Number:	10
Page Range:	S. 1162 - 1170
Date:	2014
Publisher:	WILEY-BLACKWELL
Place of Publication:	HOBOKEN
ISSN:	1552-4604
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CYTOCHROME-P450 3A; TEMPORAL VARIATION; METABOLISM; LIVER; TIME; EXPRESSION; INFUSION; HUMANS; CLOCK; BIOAVAILABILITY Multiple languages Pharmacology & Pharmacy Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42776