Variability of cytochrome P450 1A2 activity over time in young and elderly healthy volunteers.

Abstract:

AIMS:To assess the age-associated changes over time of plasma paraxanthine/caffeine (PAX/CAF) ratios used as a probe for CYP1A2 activity. METHODS:Intraindividual and interindividual variabilities in PAX/CAF ratio were compared by phenotyping with caffeine, 16 young and 16 elderly healthy subjects on five occasions. RESULTS:PAX/CAF ratio variability was comparable regardless of age (intraindividual CV: 17.6 +/- 6% and 16.2 +/- 5.9%, interindividual CV: 48.1 +/- 2.9% and 42.7 +/- 3.6% in young and elderly, respectively). The PAX/CAF ratio was lower in elderly than in young subjects (95% CI for the difference: 0.004, 0.32) but the difference was not significant in nonsmokers compared separately. CONCLUSIONS:The variability over time of the PAX/CAF ratio is not influenced by age.

journal_name

Br J Clin Pharmacol

authors

Simon T,Becquemont L,Hamon B,Nouyrigat E,Chodjania Y,Poirier JM,Funck-Brentano C,Jaillon P

doi

10.1046/j.0306-5251.2001.01494.x

keywords:

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

601-4

issue

5

eissn

0306-5251

issn

1365-2125

pii

1494

journal_volume

52

pub_type

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