title: Importance of cytochrome P-450IIIA activity in determining dosage and blood levels of FK 506 and cyclosporine in liver transplant recipients.
abstract: We have investigated the importance of cytochrome P-450IIIA enzyme activity in influencing dosage of the immunosuppressive drugs FK 506 and cyclosporine after liver transplantation. Cytochrome P-450IIIA enzyme activity in vivo was measured 1 yr postoperatively in 37 stable orthotopic liver graft recipients (21 receiving FK 506 and 16 given cyclosporine) by the erythromycin breath test and the production of monoethylglycinexylidide from lignocaine. A strong correlation existed between FK 506 dose and erythromycin breath test results (r = 0.583, p < 0.007), but no corresponding relationship with monoethylglycinexylidide production was observed. The FK 506 dose (14 to 196 micrograms/kg/day) also correlated closely with circulating predose levels of the drug in both plasma and blood (r = 0.538 and 0.731, p = 0.015 and < 0.001, respectively). Although no correlation existed between cyclosporine dose (0.254 to 0.494 mg/kg/day) and trough blood levels, a relationship was demonstrated when erythromycin breath test results were included in the derived equation: Drug dose/cytochrome P-450IIIA activity alpha drug level (p = 0.011 vs. 0.175 without erythromycin breath test). A corresponding enhancement was demonstrated with erythromycin breath test results to relate FK 506 dose and plasma levels (p = 0.006 versus 0.015 without erythromycin breath test results), although breath test results and FK 506 levels were highly discordant (p > 0.8). The use of monoethylglycinexylidide test results as an alternative measure of cytochrome P-450IIIA activity provided no comparable increase in correlation for FK 506 or cyclosporine.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Institute of Liver Studies, King's College Hospital, London, United Kingdom.
authors.forename: Y
authors.initials: Y
authors.lastname: Cakaloglu
authors.forename: J M
authors.initials: JM
authors.lastname: Tredger
authors.forename: J
authors.initials: J
authors.lastname: Devlin
authors.forename: R
authors.initials: R
authors.lastname: Williams
mesh_terms: D001189:Aryl Hydrocarbon Hydroxylases; D001944:Breath Tests; D016572:Cyclosporine / Q000008:administration & dosage* / Q000097:blood*; D051544:Cytochrome P-450 CYP3A; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D004917:Erythromycin; D005260:Female; D006801:Humans; D008012:Lidocaine / Q000031:analogs & derivatives / Q000378:metabolism; D016031:Liver Transplantation; D008297:Male; D010089:Oxidoreductases, N-Demethylating / Q000378:metabolism*; D011237:Predictive Value of Tests; D012044:Regression Analysis; D016559:Tacrolimus / Q000008:administration & dosage* / Q000097:blood*
chemical_list: D004917:Erythromycin; D016572:Cyclosporine; D003577:Cytochrome P-450 Enzyme System; D008012:Lidocaine; C001173:monoethylglycinexylidide; D001189:Aryl Hydrocarbon Hydroxylases; D051544:Cytochrome P-450 CYP3A; D010089:Oxidoreductases, N-Demethylating; D016559:Tacrolimus