title: Effect of CYP3A5 genotype on renal allograft recipients treated with tacrolimus.
abstract: OBJECTIVE
  Tacrolimus concentrations are associated with CYP3A5 genotype. The purpose of this study was to evaluate the outcomes and drug concentrations/doses among a posttransplant population with various CYP3A5 genotypes within 12 months.
  
  
  METHODS
  Sixty seven kidney recipients receiving immunosuppression with tacrolimus + mycophenolate mofetil + prednisolone were grouped according to their CYP3A5 genotypes (*1/*1; *1/*3; *3/*3). The initial dose of tacrolimus (0.15 mg/kg/d) was adjusted according to achieve a target therapeutic window. All patients underwent a protocol biopsy at 1 month posttransplantation. We assayed serum creatinine and tacrolimus blood trough concentrations to calculate the concentration per dosage during follow-up. We also investigated the incidence of acute rejection episodes and the nephrotoxicity of tacrolimus according to the renal biopsy.
  
  
  RESULTS
  There was no significant difference among serum creatinine concentrations. Tracrolimus blood concentrations showed a significant difference at day 7 and 1 month with no significant difference at 3, 6, or 12 months among the three groups. The CYP3A5*3/*3 group showed the largest concentration per dosage (C/D) and CYP3A5*1/*1, the smallest C/D. There was a significant difference among the three groups. The occurrence of an acute rejection episode within 3 months showed a significant difference among the three groups but not from 3 to 12 months after transplantation. Nephrotoxicity was greatest among the CYP3A5*3/*3 group.
  
  
  CONCLUSIONS
  CYP3A5 influenced the blood concentrations of tacrolimus. Our study suggested to choose the initial dosage according to the CYP3A5 genotype to obtain a better outcome and reduce the incidences of acute rejection episodes and nephrotoxicity.
authors: Research Institute of Nephrology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China.
authors: J S
authors: JS
authors: Chen
authors: L S
authors: LS
authors: Li
authors: D R
authors: DR
authors: Cheng
authors: S M
authors: SM
authors: Ji
authors: Q Q
authors: QQ
authors: Sun
authors: Z
authors: Z
authors: Cheng
authors: J Q
authors: JQ
authors: Wen
authors: G Z
authors: GZ
authors: Sha
authors: Z H
authors: ZH
authors: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D002102:Cadaver; D002648:Child; D003404:Creatinine / Q000097:blood; D051544:Cytochrome P-450 CYP3A / Q000235:genetics*; D004359:Drug Therapy, Combination; D005260:Female; D005838:Genotype; D006801:Humans; D007166:Immunosuppressive Agents / Q000097:blood / Q000627:therapeutic use; D016030:Kidney Transplantation / Q000276:immunology* / Q000473:pathology; D007684:Kidney Tubules / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D016559:Tacrolimus / Q000097:blood / Q000627:therapeutic use*; D014019:Tissue Donors; D014184:Transplantation, Homologous; D055815:Young Adult
chemical_list: D007166:Immunosuppressive Agents; D003404:Creatinine; C510164:CYP3A5 protein, human; D051544:Cytochrome P-450 CYP3A; D016559:Tacrolimus