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Assessment of cytochrome P4502E1 induction in alcoholic patients by chlorzoxazone pharmacokinetics.

Abstract：

:Chlorzoxazone is mainly metabolized to 6-hydroxychloroxazone (6-OHchlorzoxazone) by the ethanol-inducible cytochrome P450 2E1 (CYP2E1). To evaluate the impact of ethanol consumption on the enzyme induction, the pharmacokinetics of chlorozoxazone and 6-OHchlorzoxazone were studied in alcoholic and control subjects. Fifteen alcoholic male inpatients (all smokers, daily intake 333 +/- 191 g of absolute ethanol) and 20 healthy male volunteers (10 smokers and 10 non-smokers, weekly intake < 100 g of absolute ethanol) participated in this study. Following a 12 hr fasting period, each subject was orally administered 500 mg of chlorzoxazone. Venous blood and urine samples were collected over a 10 hr period. Areas under the curve of plasma concentration versus time (AUC) of chlorzoxazone and 6-OHchlorzoxazone was calculated. The total plasma clearance of chlorzoxazone was measured as the dose/AUC ratio. The mean total plasma clearance was not different between smoker and non-smoker controls but it was enhanced by 73% in alcoholic patients. These results indicate a negligible and non-significant effect of cigarette smoking in controls but an increased metabolism of chlorzoxazone in alcoholic patients (P < 0.05). This increase was corroborated by the 2-fold enhancement of the 6-OHchlorzoxazone/chlorzoxazone AUC ratio, compared to controls. A good correlation was found between this AUC ratio and the 6-OHchlorzoxazone/chlorzoxazone concentration ratio at t = 2 hr in patients and in controls (r = 0.88 and 0.85, respectively, P < 0.01). The concentration ratio increased by 150% in alcoholic patients and decreased by 65% in the seven alcoholics tested after 7 days of alcohol abstinence. It is therefore concluded that the 6-OHchlorzoxazone/chlorzoxazone concentration ratio at t = 2 hr could constitute a simple and non-traumatic marker of CYP2E1 induction.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Girre C,Lucas D,Hispard E,Menez C,Dally S,Menez JF

doi

10.1016/0006-2952(94)90524-x

subject

Has Abstract

pub_date

1994-04-29 00:00:00

pages

1503-8

issue

9

eissn

0006-2952

issn

1873-2968

pii

0006-2952(94)90524-X

journal_volume

47

pub_type

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