title: Study of urinary 6 beta-hydroxycortisol/cortisol ratio in spot urine sample as a biomarker of 3A4 enzyme activity in healthy and epileptic subjects of Egyptian population.
abstract: The ratio of urinary 6 beta-hydroxycortisol/cortisol (6 beta-OHC/FC) in morning spot urine samples collected from 8:00 a.m. to 12:00 p.m. was studied using ELIZA kits (Stabiligen) in a group of healthy adult Egyptians (control group) of both sex (n=65, age range: 16-48 years). The frequency distribution of urinary 6 beta-OHC/FC ratio was widely distributed among subjects with higher values in males in comparison to females. No bimodality in either sex was observed. Another group of adult epileptic patients (n=16) was studied for the influence of chronic carbamazepine antiepileptic drug administration on urinary 6 beta-OHC/FC ratio in spot urine samples. The induction property of carbamazepine on CYP3A4 was observed through significant increase (p=0.01) in 6 beta-OHC/FC ratio among epileptic patients in comparison with control subjects. In conclusion, the frequency distribution of urinary 6 beta-OHC/FC ratio among Egyptians shows sexual dimorphism. Also, measurement of urinary 6 beta-OHC/FC ratio provides a simple non-invasive method to monitor CYP3A4 enzyme induction during administration of carbamazepine antiepileptic drug.
authors.affiliation: Pharmacology Department, Faculty of Medicine, Assiut University, Assiut, Egypt. ehegypt@yahoo.com
authors.forename: Ehab S
authors.initials: ES
authors.lastname: El Desoky
authors.forename: Hanan O
authors.initials: HO
authors.lastname: Mohamed
authors.forename: Wafaa M A
authors.initials: WM
authors.lastname: Farghaly
authors.forename: Sherifa A
authors.initials: SA
authors.lastname: Hamed
authors.forename: Mohsen A
authors.initials: MA
authors.lastname: Hedaya
authors.forename: Jean-Pascal
authors.initials: JP
authors.lastname: Siest
mesh_terms: D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000652:urine; D051544:Cytochrome P-450 CYP3A; D003577:Cytochrome P-450 Enzyme System / Q000652:urine*; D004534:Egypt; D004789:Enzyme Activation / Q000502:physiology; D004827:Epilepsy / Q000201:enzymology* / Q000652:urine*; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000031:analogs & derivatives* / Q000652:urine*; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis
chemical_list: D015415:Biomarkers; C001380:6 beta-hydroxycortisol; D003577:Cytochrome P-450 Enzyme System; C104464:CYP3A protein, human; D051544:Cytochrome P-450 CYP3A; C510163:CYP3A4 protein, human; D006854:Hydrocortisone