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Correlation between omeprazole hydroxylase and CYP2C19 genotype in North Indians
J K Lamba1, R K Dhiman, R Singh
1Department of Biochemistry, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
European Journal of Clinical Pharmacology
|January 17, 2002
Summary
This study found a strong link between omeprazole (OMZ) hydroxylase activity in North Indians and their CYP2C19 genetic makeup. Genetic variations in CYP2C19 influence how individuals metabolize OMZ.
Area of Science:
- Pharmacogenomics
- Drug Metabolism
- Genetics
Background:
- Omeprazole (OMZ) is a widely used proton pump inhibitor.
- CYP2C19 is a key enzyme involved in OMZ metabolism.
- Genetic variations in CYP2C19 can affect drug efficacy and safety.
Purpose of the Study:
- To investigate the correlation between in vitro hepatic omeprazole (OMZ) hydroxylase activity and CYP2C19 genotype in North Indians.
- To understand the impact of CYP2C19 polymorphisms on OMZ metabolism in this population.
Main Methods:
- Liver microsomes from 15 North Indians were used to assay OMZ hydroxylase activity.
- High-performance liquid chromatography (HPLC) was employed to quantify 5-OH-OMZ.
- Genotyping for CYP2C19*2 and *3 polymorphisms was performed using PCR-based methods.
Main Results:
- Thirteen subjects were classified as extensive metabolizers (EMs) with varying OMZ hydroxylase activity.
- Homozygous CYP2C19*1/*1 individuals exhibited the highest activity.
- Two subjects identified as poor metabolizers (PMs) with CYP2C19*2/*2 genotype showed significantly reduced activity.
Conclusions:
- A clear concordance exists between in vitro OMZ hydroxylase activity and CYP2C19 genotype in North Indians.
- These findings highlight the importance of pharmacogenetics in predicting OMZ metabolism.