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Current Drug Metabolism

Editor-in-Chief

ISSN (Print): 1389-2002
ISSN (Online): 1875-5453

Research Article

Impact of POR*28 Variant on Tacrolimus Pharmacokinetics in Kidney Transplant Patients with Different CYP3A5 Genotypes

Author(s): Janaina B. F. Everton, Fernando J. B. Patrício, Manuel S. Faria, Teresa C. A. Ferreira, Natalino Salgado Filho, Gyl E.B. Silva, Elen A. Romão and Marcelo Magalhães*

Volume 23, Issue 3, 2022

Published on: 09 June, 2022

Page: [233 - 241] Pages: 9

DOI: 10.2174/1389200223666220516094226

Price: $65

Abstract

Background: The introduction of tacrolimus (TAC) to clinical practice was essential to the establishment of transplantation as a therapy for patients with chronic renal disease. However, the higher interindividual variation of TAC metabolism has been an important limiting factor for its clinical use. Although the relationship between CYP3A5 polymorphisms and TAC pharmacokinetics (PK) is well established, the effects of other genetic variants on TAC metabolism, such as POR*28, still remain uncertain.

Objective: The study aimed to evaluate the impact of POR variants on TAC PK in renal transplant patients with different CYP3A5 genotypes (expressers and non-expressers).

Methods: A total of 115 patients were included in this study. Genomic DNA was isolated from peripheral blood, and the real-time PCR technique was used to analyze the polymorphism POR rs1057868; C>T.

Results: During the initial post-transplant period, variant allele carriers (*1/*28 and *28/*28) showed a lower TAC dose requirement than POR wild homozygotes (*1/*1). Regarding the influence of the different polymorphisms of POR within the CYP3A5 expresser and non-expresser groups, no differences were observed in any of the PK parameters analyzed during 12 months after transplantation.

Conclusion: In the studied population, the variant allelic POR*28 was significantly associated with lower TAC dose requirements and higher Co/D ratio in the first-month post-transplant. However, the effects of this polymorphism on the CYP3A5 enzyme activity were not observed.

Keywords: Genetic polymorphism, pharmacokinetics, POR, Co/D ratio, kidney transplantation, risk of rejection, admixed population.

Graphical Abstract

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