Flavopiridol Pharmacogenetics: Clinical and Functional Evidence for the Role of SLCO1B1/OATP1B1 in Flavopiridol Disposition
| Autor: | Sunjoo Ahn, Wolfgang Sadee, Michael R. Grever, Amy J. Johnson, David Jarjoura, Wenjun Ni, Jia Ji, Zunyan Dai, Audrey C. Papp, Mitch A. Phelps, Katherine L. Farley, Thomas S. Lin, Xiaobai Li, James T. Dalton, John C. Byrd |
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| Rok vydání: | 2010 |
| Předmět: |
Male
Candidate gene Glucuronosyltransferase Organic anion transporter 1 Organic Anion Transporters lcsh:Medicine Pharmacology 030226 pharmacology & pharmacy 0302 clinical medicine Piperidines ATP Binding Cassette Transporter Subfamily G Member 2 Tissue Distribution lcsh:Science Aged 80 and over education.field_of_study Multidisciplinary biology Liver-Specific Organic Anion Transporter 1 Middle Aged Multidrug Resistance-Associated Protein 2 Neoplasm Proteins 3. Good health 030220 oncology & carcinogenesis UDP-Glucuronosyltransferase 1A9 Female Multidrug Resistance-Associated Proteins Pharmacology/Personalized Medicine Research Article Adult Genotype Metabolic Clearance Rate Population Genetics and Genomics/Pharmacogenomics Single-nucleotide polymorphism Models Biological Polymorphism Single Nucleotide Cell Line 03 medical and health sciences Pharmacokinetics Animals Humans education Protein Kinase Inhibitors Aged Flavonoids Analysis of Variance lcsh:R Leukemia Lymphocytic Chronic B-Cell HEK293 Cells biology.protein ATP-Binding Cassette Transporters lcsh:Q SLCO1B1 Pharmacogenetics Pharmacology/Drug Development |
| Zdroj: | PLoS ONE, Vol 5, Iss 11, p e13792 (2010) PLoS ONE |
| ISSN: | 1932-6203 |
| Popis: | Background: Flavopiridol is a cyclin-dependent kinase inhibitor in phase II clinical development for treatment of various forms of cancer. When administered with a pharmacokinetically (PK)-directed dosing schedule, flavopiridol exhibited striking activity in patients with refractory chronic lymphocytic leukemia. This study aimed to evaluate pharmacogenetic factors associated with inter-individual variability in pharmacokinetics and outcomes associated with flavopiridol therapy. Methodology/Principal Findings: Thirty-five patients who received single-agent flavopiridol via the PK-directed schedule were genotyped for 189 polymorphisms in genes encoding 56 drug metabolizing enzymes and transporters. Genotypes were evaluated in univariate and multivariate analyses as covariates in a population PK model. Transport of flavopiridol and its glucuronide metabolite was evaluated in uptake assays in HEK-293 and MDCK-II cells transiently transfected with SLCO1B1. Polymorphisms in ABCC2, ABCG2, UGT1A1, UGT1A9, and SLCO1B1 were found to significantly correlate with flavopiridol PK in univariate analysis. Transport assay results indicated both flavopiridol and flavopiridol-glucuronide are substrates of the SLCO1B1/OATP1B1 transporter. Covariates incorporated into the final population PK model included bilirubin, SLCO1B1 rs11045819 and ABCC2 rs8187710. Associations were also observed between genotype and response. To validate these findings, a second set of data with 51 patients was evaluated, and overall trends for associations between PK and PGx were found to be consistent. Conclusions/Significance: Polymorphisms in transport genes were found to be associated with flavopiridol disposition and outcomes. Observed clinical associations with SLCO1B1 were functionally validated indicating for the first time its relevance as a transporter of flavopiridol and its glucuronide metabolite. A second 51-patient dataset indicated similar trends between genotype in the SLCO1B1 and other candidate genes, thus providing support for these findings. Further study in larger patient populations will be necessary to fully characterize and validate the clinical impact of polymorphisms in SLCO1B1 and other transporter and metabolizing enzyme genes on outcomes from flavopiridol therapy. |
| Databáze: | OpenAIRE |
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