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Published on: January 27, 2014
CYP2C8*3 and *4 define CYP2C8 phenotype: An approach with the substrate cinitapride
Diana María Campodónico1, Pablo Zubiaur1,2, Paula Soria-Chacartegui1
1Clinical Pharmacology Department, Instituto Teófilo Hernando, Instituto de Investigación Sanitaria La Princesa (IP), Hospital Universitario de La Princesa, Universidad Autónoma de Madrid (UAM), Madrid, Spain.
Genetic variants in CYP2C8 significantly impact cinitapride drug levels. Specific CYP2C8 alleles influence cinitapride pharmacokinetics, affecting drug metabolism and potentially patient response.
Area of Science:
- Pharmacogenomics
- Drug Metabolism
- Clinical Pharmacology
Background:
- Cinitapride is a gastrointestinal prokinetic agent used for functional dyspepsia and GERD.
- Individual variability in drug response necessitates understanding genetic influences on drug pharmacokinetics.
Purpose of the Study:
- To investigate the impact of pharmacogene variants, particularly in CYP2C8 and CYP3A4, on cinitapride pharmacokinetics and safety.
- To evaluate the functional consequences of specific CYP2C8 alleles on enzyme activity.
Main Methods:
- Genotyping of 56 variants in 19 genes (including CYP2C8, CYP3A4) in 25 healthy volunteers.
- Analysis of pharmacokinetic parameters (AUC, Cmax) in relation to genetic profiles.
- Characterization of pharmacogenetic phenotypes (UM, RM, NM, IM, PM) for CYP2C8.
Main Results:
- CYP2C8*3 carriers exhibited significantly reduced cinitapride AUC (42%) and Cmax (35%).
- CYP2C8*4 allele carriers showed increased AUC (45%) and Cmax (63%), though not statistically significant.
- Established methods to infer pharmacogenetic phenotypes based on CYP2C8 alleles.
Conclusions:
- CYP2C8 genetic variants significantly influence cinitapride pharmacokinetics.
- Findings are relevant for optimizing cinitapride therapy and understanding metabolism of other CYP2C8 substrates.
- Further research is needed to fully characterize extreme metabolizer phenotypes (UMs, PMs).
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