Rapid Screening Phenotype Test To Evaluate CYP 2C19 Enzyme Activity Using Stable Isotope [13C]Pantoprazole

Summary

The purpose of this study is to determine the function of an enzyme that breaks down drugs and helps the removal of drugs from your body. This enzyme is called cytochrome P450 2C19 and is located in your liver. Exposure to other medications or variations in genes that you have inherited from your parents, may speed up or slow the function of this enzyme. As a result, some patients may develop unwanted effects from a drug while some other patients may not get benefit from taking the same drug. The aim of this study is to determine the function of this enzyme in your liver. We will do this by performing a series of breath tests and blood samples after you take pantoprazole. Pantoprazole is approved as an oral and intravenous drug by the Food and Drug Administration (FDA).

Timeline

Start

2007-03

Primary completion

2008-12

Completion

2009-01

Publications

• Background Desta Z, Zhao X, Shin JG, Flockhart DA. Clinical significance of the cytochrome P450 2C19 genetic polymorphism. Clin Pharmacokinet. 2002;41(12):913-58. doi: 10.2165/00003088-200241120-00002.
• Background Goldstein JA. Clinical relevance of genetic polymorphisms in the human CYP2C subfamily. Br J Clin Pharmacol. 2001 Oct;52(4):349-55. doi: 10.1046/j.0306-5251.2001.01499.x.
• Background De Morais SM, Wilkinson GR, Blaisdell J, Meyer UA, Nakamura K, Goldstein JA. Identification of a new genetic defect responsible for the polymorphism of (S)-mephenytoin metabolism in Japanese. Mol Pharmacol. 1994 Oct;46(4):594-8.
• Background de Morais SM, Wilkinson GR, Blaisdell J, Nakamura K, Meyer UA, Goldstein JA. The major genetic defect responsible for the polymorphism of S-mephenytoin metabolism in humans. J Biol Chem. 1994 Jun 3;269(22):15419-22.
• Background Ibeanu GC, Blaisdell J, Ghanayem BI, Beyeler C, Benhamou S, Bouchardy C, Wilkinson GR, Dayer P, Daly AK, Goldstein JA. An additional defective allele, CYP2C19*5, contributes to the S-mephenytoin poor metabolizer phenotype in Caucasians. Pharmacogenetics. 1998 Apr;8(2):129-35. doi: 10.1097/00008571-199804000-00006.
• Background Ibeanu GC, Goldstein JA, Meyer U, Benhamou S, Bouchardy C, Dayer P, Ghanayem BI, Blaisdell J. Identification of new human CYP2C19 alleles (CYP2C19*6 and CYP2C19*2B) in a Caucasian poor metabolizer of mephenytoin. J Pharmacol Exp Ther. 1998 Sep;286(3):1490-5.
• Background Ferguson RJ, De Morais SM, Benhamou S, Bouchardy C, Blaisdell J, Ibeanu G, Wilkinson GR, Sarich TC, Wright JM, Dayer P, Goldstein JA. A new genetic defect in human CYP2C19: mutation of the initiation codon is responsible for poor metabolism of S-mephenytoin. J Pharmacol Exp Ther. 1998 Jan;284(1):356-61.
• Background Sim SC, Risinger C, Dahl ML, Aklillu E, Christensen M, Bertilsson L, Ingelman-Sundberg M. A common novel CYP2C19 gene variant causes ultrarapid drug metabolism relevant for the drug response to proton pump inhibitors and antidepressants. Clin Pharmacol Ther. 2006 Jan;79(1):103-13. doi: 10.1016/j.clpt.2005.10.002.

Drugs

Indications

No indication recorded.