Dosage Optimization Based on Population Pharmacokinetic Analysis of Tacrolimus in Chinese Patients with Nephrotic Syndrome
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Abstract
Purpose
The objective of this study was to merge genetic and non-genetic factors of tacrolimus pharmacokinetics to establish a more stable population pharmacokinetic model for individualized dosage regimen in Chinese nephrotic syndrome patients.
Methods
Nephrotic syndrome patients (>16 years old) treated with tacrolimus were included in the study. The population pharmacokinetic approach was analyzed using NONMEM version 7.3.0 software. Monte Carlo simulations were performed to optimize the dosage according to the population pharmacokinetic parameters of tacrolimus.
Results
The mean apparent clearance (CL/F) of tacrolimus was 13.4 L/h, with an inter-individual variability of 22.4%. The CL/F of tacrolimus in Wuzhi tablets co-administration and CYP3A5 non-expresser groups were 19.3% and 19.1% lower than that of the non-Wuzhi tablets and CYP3A5 expresser groups, respectively. The NR1I2 rs2276707 TT variant carriers had 1.17-fold CL/F compared to the CC/CT variant carriers. Monte Carlo simulation showed that the nephrotic syndrome patients that were CYP3A5 non-expressers or co-administered Wuzhi tablets received 50% or 33.3% lower dose of tacrolimus to reach the target concentration. In contrast, the NR1I2 rs227707 TT genotype carriers were administered a 33.3% higher dose of tacrolimus than the NR1I2 rs227707 CC/CT genotype carriers.
Conclusions
A new population pharmacokinetic model was established to describe the pharmacokinetics of tacrolimus in nephrotic syndrome patients, which can be used to select rational dosage regimens to achieve a desirable whole-blood concentration.
KEY WORDS
dosage optimization genetic polymorphisms nephrotic syndrome population pharmacokinetics tacrolimusAbbreviations
- 95% CIs
95% confidence intervals
- ALB
Albumin
- ALT
Alanine aminotransferase
- AST
Aspartate aminotransferase
- C0
Whole blood trough concentrations
- CL
Clearance
- CWRES
Conditional weighted residuals
- CYP3A4
Cytochrome P450 3A4
- CYP3A5
Cytochrome P450 3A5
- DV
Observed concentration
- F
Bioavailability
- HCT
Hematocrit
- HGB
Hemoglobin
- IPRED
Individual predicted concentration
- MDR1
Multiple drug resistance 1
- MRP2
Multidrug resistance -associated protein 2
- NPDE
Normalized prediction distribution errors
- OFV
Objective function value
- PRED
Predicted concentration
- PsN
Perl-Speaks-NONMEM
- PXR
Pregnane X receptor
- RBC
Red blood cells
- SNPs
Single nucleotide polymorphisms
- SUMO4
Small ubiquitin-related modifier 4
- Vd
Volume of distribution
- VPC
Visual predictive check
Notes
Supplementary material
Correlations between covariates. WT weight, ALB albumin, ALT alanine aminotransferase, AST aspartate aminotransferase, RBC red blood cells, HGB hemoglobin, HCT hematocrit. (PNG 190 kb)
Effects of covariates on tacrolimus oral clearance (L/h). AST aspartate aminotransferase, ALT alanine aminotransferase, ALB albumin, HGB hemoglobin, HCT hematocrit, RBC red blood cells, CYP3A4 Cytochrome P450 3A4, CYP3A5 Cytochrome P450 3A5, MDR1 Multiple drug resistance 1, MRP2 Multidrug resistance -associated protein 2, SUMO4 Small ubiquitin-related modifier 4, NR1I2 (PXR) Pregnane X receptor. (PNG 348 kb)
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