Abstract:
BACKGROUND:Tacrolimus pharmacokinetic characteristics vary greatly among individuals. Tacrolimus is a substrate of cytochrome p450 (CYP), of subfamily CYP3A. CYP3A activity is the sum of the activities of the family of CYP3A genes, including CYP3A5. Subjects with the CYP3A5*1/*1 genotype express large amounts of CYP3A5. Heterozygotes (genotype CYP3A5*1/*3) also express the enzyme. We postulated that CYP3A5 polymorphism is associated with tacrolimus pharmacokinetic variations. METHODS:CYP3A5 genotype was evaluated in 80 renal transplant recipients and correlated with the daily tacrolimus dose and concentration-to-dose ratio. RESULTS:The frequency of the homozygous CYP3A5*1 genotype (CYP3A5*1/*1) was 5%, and 11% of subjects were heterozygous (CYP3A5*1/*3). The mean doses required to obtain the targeted concentration-to-dose ratio were significantly lower in patients with the CYP3A5*1/*1 genotype. CONCLUSIONS:Determination of CYP3A5 genotype is predictive of the dose of tacrolimus in renal transplant recipients and may help to determine the initial daily dose needed by individual patients for adequate immunosuppression without excess nephrotoxicity.
journal_name
Transplantationjournal_title
Transplantationauthors
Thervet E,Anglicheau D,King B,Schlageter MH,Cassinat B,Beaune P,Legendre C,Daly AKdoi
10.1097/01.TP.0000090753.99170.89subject
Has Abstractpub_date
2003-10-27 00:00:00pages
1233-5issue
8eissn
0041-1337issn
1534-6080journal_volume
76pub_type
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