title: Association study of ABCB1 and CYP3A5 gene polymorphisms with sirolimus trough concentration and dose requirements in Chinese renal transplant recipients.
abstract: The objective of this study was to investigate the possible association of the ABCB1 gene C3435 T polymorphism and the CYP3A5 gene A6986G polymorphism with sirolimus (SRL) trough concentration and dose requirements in Chinese stable renal transplant recipients. Blood samples were collected from 105 healthy volunteers and 50 renal transplant patients, whose polymorphisms of the ABCB1 and CYP3A5 genes were determined by polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP). Plasma concentrations of SRL were determined with HPLC. The allele frequencies of the ABCB1 mutation in Chinese healthy volunteers and renal transplant recipients were 51.0% and 44.0% (p>0.05), while the allele frequencies of the CYP3A5 mutation were 72.9% and 71.0% (p>0.05). The SRL concentration/dose ratio (C/D) in patients with CYP3A5 (*)3/(*)3 were significantly higher than that of those with (*)1 allele (p<0.05). However, no significant differences were observed between C/D and ABCB1 SNPs (p>0.05). These results confirm that when treated with a SRL-based therapy and low-dose steroids, patients carrying the CYP3A5(*)1 allele required significantly more SRL to achieve adequate blood trough concentrations. In patients with SRL-based therapy, genotyping of the CYP3A5 genes may help to optimize the SRL management in renal transplant recipients.
authors.affiliation: Clinical Pharmacology Research Laboratory, The First Affiliated Hospital of Soochow University, Suzhou 215006, China. miaolysuzhou@163.com
authors.forename: Li-Yan
authors.initials: LY
authors.lastname: Miao
authors.forename: Chen-Rong
authors.initials: CR
authors.lastname: Huang
authors.forename: Jian-Quan
authors.initials: JQ
authors.lastname: Hou
authors.forename: Mei-Ying
authors.initials: MY
authors.lastname: Qian
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics*; D000328:Adult; D000704:Analysis of Variance; D044466:Asian People / Q000235:genetics*; D016009:Chi-Square Distribution; D016572:Cyclosporine / Q000493:pharmacokinetics / Q000627:therapeutic use; D051544:Cytochrome P-450 CYP3A; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004247:DNA / Q000097:blood / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D007166:Immunosuppressive Agents / Q000493:pharmacokinetics* / Q000627:therapeutic use; D016030:Kidney Transplantation / Q000208:ethnology / Q000379:methods*; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide; D020123:Sirolimus / Q000493:pharmacokinetics / Q000627:therapeutic use; D016559:Tacrolimus / Q000493:pharmacokinetics / Q000627:therapeutic use
chemical_list: C513055:ABCB1 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D007166:Immunosuppressive Agents; D016572:Cyclosporine; D004247:DNA; D003577:Cytochrome P-450 Enzyme System; C510164:CYP3A5 protein, human; D051544:Cytochrome P-450 CYP3A; D020123:Sirolimus; D016559:Tacrolimus