Aim To compare plasma 4-hydroxycholesterol:cholesterol with urinary 6-hydroxycortisol:cortisol as markers of cytochrome P4503A4 activity before and after treatment with rifampicin for 2 weeks. Method 6-hydroxycortisol and cortisol were determined by liquid chromatography tandem mass spectrometry and 4-hydroxycholesterol was determined by gas chromatographymass spectrometry in three groups of healthy volunteers. Results Induction ratios for 6-hydroxycortisol:cortisol were 1.8, 3.9 and 4.5 for 20mgday1, 100mgday1 or 500mgday1 of rifampicin, respectively. The corresponding ratios for 4-hydroxycholesterol:cholesterol were 1.5, 2.4 and 3.8. Conclusions Plasma 4-hydroxycholesterol:cholesterol gave similar induction ratios to urinary 6-hydroxycortisol:cortisol.
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Chinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Caritas Inst Higher Educ, Sch Hlth Sci, Tseung Kwan O, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Chan, S. W.
Xiao, Y.
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Chinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Xiao, Y.
Hu, M.
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Chinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Hu, M.
Yin, O. Q. P.
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Chinese Univ Hong Kong, Sch Pharm, Hong Kong, Hong Kong, Peoples R China
Novartis Pharmaceut, Florham Pk, NJ USAChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Yin, O. Q. P.
Chu, T. T. W.
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Chinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Chu, T. T. W.
Fok, B. S. P.
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Chinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Fok, B. S. P.
Lee, V. H. L.
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Chinese Univ Hong Kong, Sch Pharm, Hong Kong, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
Lee, V. H. L.
Tomlinson, B.
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Chinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China