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Pharmacogenetic effects of regulatory nuclear receptors (PXR, CAR, RXRα and HNF4α) on docetaxel disposition in Chinese nasopharyngeal cancer patients
Purpose This exploratory study was aimed at elucidating the pharmacogenetics of regulatory nuclear receptors (PXR, CAR, RXRα and HNF4α) and their implications on docetaxel pharmacokinetics and pharmacodynamics in local Chinese nasopharyngeal cancer patients. Methods A total of 59 single nucleotide p...
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Published in: | European journal of clinical pharmacology 2014-02, Vol.70 (2), p.155-166 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Purpose
This exploratory study was aimed at elucidating the pharmacogenetics of regulatory nuclear receptors (PXR, CAR, RXRα and HNF4α) and their implications on docetaxel pharmacokinetics and pharmacodynamics in local Chinese nasopharyngeal cancer patients.
Methods
A total of 59 single nucleotide polymorphisms (SNPs), including tag-SNPs and functionally relevant SNPs of the genes encoding these regulatory nuclear receptors (PXR/
NR1I2
, CAR/
NR1I3
, RXRα/
NR2B1
and HNF4α/
NR2A1
), were profiled in the patients enrolled in our study by direct sequencing (
N
= 50). The generalized linear model was employed to estimate the haplotypic effects on the pharmacokinetics and pharmacodynamics of the patients.
Results
The pharmacokinetic profiles of docetaxel in these patients were characterized by marked interindividual variability, with approximately four- to sixfold variations observed in C
max
, AUC
0-∞
and CL. Individual SNP association tests revealed that polymorphisms in
NR2B1
and
NR2A1
were significantly correlated with altered docetaxel pharmacokinetics. Subsequent haplotype association analysis identified the
NR2B1
LD block 2 AG haplotype [*+4458G>A(rs3132291) and *+4988A>G(rs4842198)] to be significantly associated with altered pharmacokinetics, in which patients carrying two copies of the AG haplotype had approximately a 20 % decreased C
max
and AUC
0-∞
and a 21 % increased CL compared to those who carried only one copy or no copies of the haplotype. A number of SNPs in
NR1I2
,
NR1I3
,
NR2B1
and
NR2A1
were also associated with a significant decrease in blood counts from baseline. No haplotype was found to exert any effects on the pharmacodynamics parameters.
Conclusions
The present exploratory study identified several SNPs in the genes encoding regulatory nuclear receptors which may account for the interpatient variability in docetaxel pharmacokinetics and pharmacodynamics. These findings highlight the important role of regulatory nuclear receptors on the disposition of docetaxel. |
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ISSN: | 0031-6970 1432-1041 |
DOI: | 10.1007/s00228-013-1596-3 |