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Nies AT, Schaeffeler E, Schwab M. Hepatic solute carrier transporters and drug therapy: Regulation of expression and impact of genetic variation. Pharmacol Ther 2022; 238:108268. [DOI: 10.1016/j.pharmthera.2022.108268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 07/25/2022] [Accepted: 08/15/2022] [Indexed: 11/30/2022]
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Tajiri A, Hirota T, Kawano S, Yonamine A, Ieiri I. Regulation of Organic Anion Transporting Polypeptide 2B1 Expression by MicroRNA in the Human Liver. Mol Pharm 2020; 17:2821-2830. [PMID: 32602343 DOI: 10.1021/acs.molpharmaceut.0c00193] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Organic anion transporting polypeptide 2B1 (OATP2B1, SLCO2B1) is an uptake transporter expressed in several tissues, including the liver, intestine, brain, kidney, and skeletal muscle. Hepatocyte nuclear factor 4 alpha (HNF4α) is known as an important transcriptional factor of OATP2B1 in the liver. It has been reported that there are large interindividual differences in OATP2B1 mRNA and protein expressions in human livers. The mechanism causing the interindividual differences in OATP2B1 expression is still unclear. MicroRNAs (miRNAs) control gene expression by leading translational repression and/or degradation of the target mRNA. There is no significant correlation between OATP2B1 mRNA and protein expression, suggesting that post-transcriptional regulating mechanisms, such as miRNAs, play an important role in the interindividual differences in OATP2B1 expression. In this study, we hypothesized that certain miRNAs cause the interindividual differences in OATP2B1 expression in the human liver. In silico analysis showed that miR-24 was a candidate miRNA regulating OATP2B1 expression. It has been reported that miR-24 degrades HNF4α mRNA expression. We revealed that the miR-24 expression level was negatively correlated with OATP2B1 mRNA, protein, and HNF4α mRNA expression levels in human livers. Transfection by the miR-24 precursor decreased the luciferase activity in the transfected cells with the vector containing the OATP2B1 3' untranslated region (3'UTR) or SLCO2B1 promoter region. In HepaRG cells, miR-24 decreased the OATP2B1 and HNF4α expression levels. These results suggest that miR-24 represses not only the translation of OATP2B1 but also the transcription of OATP2B1 by HNF4α mRNA degradation.
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Affiliation(s)
- Ayaka Tajiri
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takeshi Hirota
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Sasagu Kawano
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Akira Yonamine
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Ichiro Ieiri
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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Taniguchi T, Zanetti-Yabur A, Wang P, Usyk M, Burk RD, Wolkoff AW. Interindividual Diversity in Expression of Organic Anion Uptake Transporters in Normal and Cirrhotic Human Liver. Hepatol Commun 2020; 4:739-752. [PMID: 32363323 PMCID: PMC7193130 DOI: 10.1002/hep4.1489] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 01/23/2020] [Indexed: 12/12/2022] Open
Abstract
The liver plays an essential role in removing endogenous and exogenous compounds from the circulation. This function is mediated by specific transporters, including members of the family of organic anion transport proteins (OATPs) and the Na+-taurocholate transporting polypeptide (NTCP). In the present study, transporter protein expression was determined in liver samples from patients with cirrhosis or controls without liver disease. Five transporters (OATP1A2, OATP1B1, OATP1B3, OATP2B1, and NTCP) were studied. Transporter content in homogenates of human liver was quantified on western blots probed with transporter-specific antibodies in which a calibrated green fluorescent protein-tagged transporter standard was included. Liver samples from 21 patients with cirrhosis (hepatitis C in 17 and alcohol abuse in 4) and 17 controls without liver disease were analyzed. Expression of each of the transporters had a large spread, varying by an order of magnitude in cirrhotic and control livers. OATP1B1 was the most abundant transporter in controls (P < 0.01) but was significantly lower in cirrhotic livers as was NTCP expression (P < 0.01). There was little difference in transporter expression with respect to age or sex. Despite the large variability in transporter expression within a group, analysis in individuals showed that those with high or low expression of one transporter had a similar magnitude in expression of the others. Conclusion: Differences in transporter expression could explain unanticipated heterogeneity of drug transport and metabolism in individuals with and without liver disease.
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Affiliation(s)
- Tatsuya Taniguchi
- Marion Bessin Liver Research Center Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY.,Division of Hepatology Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY
| | - Alana Zanetti-Yabur
- Marion Bessin Liver Research Center Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY.,Division of Hepatology Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY
| | - Pijun Wang
- Marion Bessin Liver Research Center Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY.,Division of Hepatology Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY
| | - Mykhaylo Usyk
- Department of Pediatrics Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY
| | - Robert D Burk
- Department of Pediatrics Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY.,Department of Epidemiology and Population Health Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY.,Department of Microbiology and Immunology Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY
| | - Allan W Wolkoff
- Marion Bessin Liver Research Center Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY.,Division of Hepatology Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY.,Department of Anatomy and Structural Biology Albert Einstein College of Medicine and Montefiore Medical Center Bronx NY
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Berlin S, Wallstabe S, Scheuch E, Oswald S, Hasan M, Wegner D, Grube M, Venner M, Ullrich A, Siegmund W. Intestinal and hepatic contributions to the pharmacokinetic interaction between gamithromycin and rifampicin after single-dose and multiple-dose administration in healthy foals. Equine Vet J 2017; 50:525-531. [PMID: 29239016 DOI: 10.1111/evj.12796] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Accepted: 12/02/2017] [Indexed: 11/28/2022]
Abstract
BACKGROUND Standard treatment of foals with severe abscessing lung infection caused by Rhodococcus equi using rifampicin and a macrolide antibiotic can be compromised by extensive inhibition and/or induction of drug metabolising enzymes (e.g. CYP3A4) and transport proteins (e.g. P-glycoprotein), as has been shown for rifampicin and clarithromycin. The combination of rifampicin with the new, poorly metabolised gamithromycin, a long-acting analogue of azithromycin and tulathromycin with lower pharmacokinetic interaction potential, might be a suitable alternative. OBJECTIVES To evaluate the pharmacokinetic interactions and pulmonary distribution of rifampicin and gamithromycin in healthy foals, and to investigate the cellular uptake of gamithromycin in vitro. STUDY DESIGN Controlled, four-period, consecutive, single-dose and multiple-dose study. METHODS Pharmacokinetics and lung distribution of rifampicin (10 mg/kg) and gamithromycin (6 mg/kg) were measured in nine healthy foals using LC-MS/MS. Enzyme induction was confirmed using the 4β-OH-cholesterol/cholesterol ratio. Affinity of gamithromycin to drug transport proteins was evaluated in vitro using equine hepatocytes and MDCKII-cells stably transfected with human OATP1B1, OATP1B3 and OATP2B1. RESULTS Rifampicin significantly (P<0.05) increased the plasma exposure of gamithromycin (16.2 ± 4.77 vs. 8.57 ± 3.10 μg × h/mL) by decreasing the total body clearance. Otherwise, gamithromycin significantly lowered plasma exposure of single- and multiple-dose rifampicin (83.8 ± 35.3 and 112 ± 43.1 vs. 164 ± 96.7 μg × h/mL) without a change in metabolic ratio and half-life. Gamithromycin was identified as an inhibitor of human OATP1B1, OATP1B3 and OATP2B1 and as a substrate of OATP2B1. In addition, it was extracted by equine hepatocytes via a mechanism which could be inhibited by rifampicin. MAIN LIMITATIONS Influence of gamithromycin on pulmonary distribution of rifampicin was not evaluated. CONCLUSION The plasma exposure of gamithromycin is significantly increased by co-administration of rifampicin which is most likely caused by inhibition of hepatic elimination.
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Affiliation(s)
- S Berlin
- Department of Clinical Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine of Greifswald, Greifswald, Germany
| | | | - E Scheuch
- Department of Clinical Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine of Greifswald, Greifswald, Germany
| | - S Oswald
- Department of Clinical Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine of Greifswald, Greifswald, Germany
| | - M Hasan
- Department of Clinical Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine of Greifswald, Greifswald, Germany
| | - D Wegner
- Department of Clinical Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine of Greifswald, Greifswald, Germany
| | - M Grube
- Department of General Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine of Greifswald, Greifswald, Germany
| | - M Venner
- Veterinary Clinic for Horses, Destedt, Germany
| | - A Ullrich
- PRIMACYT Cell Culture Technology GmbH, Schwerin, Germany
| | - W Siegmund
- Department of Clinical Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine of Greifswald, Greifswald, Germany
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Kim KA, Lee HM, Joo HJ, Park IB, Park JY. Effects of polymorphisms of the SLCO2B1 transporter gene on the pharmacokinetics of montelukast in humans. J Clin Pharmacol 2013; 53:1186-93. [PMID: 23970434 DOI: 10.1002/jcph.144] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 06/30/2013] [Indexed: 01/08/2023]
Abstract
Montelukast, a leukotriene receptor antagonist, is a substrate of organic anion transporting OATP2B1 encoded by the SLCO2B1. We evaluated the effects of six non-synonymous (c.1175C>T, c.1457C>T, c.43C>T, c.935G>A, c.601G>A, and c.644A>T) polymorphisms and one promoter (g.-282G>A) polymorphism on the pharmacokinetics of montelukast. A single dose of 10 mg montelukast was administered in 24 healthy subjects. Its levels were measured up to 24 hours and a pharmacokinetic analysis was performed based on the SLCO2B1 polymorphisms. We did not encounter subjects with c.1175C>T, c.43C>T, or c.644A>T polymorphisms. The remaining SLCO2B1 polymorphisms did not affect plasma levels of montelukast, and pharmacokinetic parameters of montelukast did not differ among genotype groups. Oral clearance results were as follows: (1) 3.3 L/h for c.935GG, 3.0 L/h for c.935GA, and 3.5 L/h for c.935AA; (2) 3.4 L/h for c.1457CC, 2.9 L/h for c.1457CT, and 3.2 L/h for c.1457TT; (3) 3.2 L/h for c.601GG, 3.4 L/h for c.601GA, and 3.4 L/h for c.601AA; (4) 3.2 L/h for g.-282GG, 3.4 L/h for g.-282GA, and 3.2 L/h for g.-282AA. The findings suggest that SLCO2B1 polymorphisms do not affect the pharmacokinetics of montelukast and that SLCO2B1 polymorphisms appear to be a minor determinant of inter-individual variability of montelukast.
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Affiliation(s)
- Kyoung-Ah Kim
- Department of Clinical Pharmacology & Toxicology, Anam Hospital, Korea University College of Medicine, Seoul, Korea
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SLCO2B1 c.935G>A single nucleotide polymorphism has no effect on the pharmacokinetics of montelukast and aliskiren. Pharmacogenet Genomics 2013; 23:19-24. [PMID: 23151832 DOI: 10.1097/fpc.0b013e32835bac90] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
OBJECTIVE A nonsynonymous single nucleotide polymorphism (SNP) in the SLCO2B1 gene encoding organic anion transporting polypeptide 2B1 (OATP2B1), c.935G>A (p.R312Q; rs12422149), has been associated with reduced plasma concentrations of montelukast in patients with asthma. Our aim was to examine the possible effects of the SLCO2B1 c.935G>A SNP on the single-dose pharmacokinetics of the suggested OATP2B1 substrates montelukast and aliskiren. METHODS Sixteen healthy volunteers with the SLCO2B1 c.935GG genotype, 12 with the c.935GA genotype, and five with the c.935AA genotype ingested a single 10 mg dose of montelukast or a 150 mg dose of aliskiren, with a washout period of 1 week. Plasma montelukast concentrations were measured up to 24 h. Plasma and urine aliskiren concentrations were measured up to 72 and 12 h, respectively, and plasma renin activity up to 24 h after aliskiren intake. RESULTS The SLCO2B1 genotypes had no significant effect on the pharmacokinetics of montelukast or aliskiren. The geometric mean ratios with 90% confidence intervals of montelukast area under the plasma concentration-time curve from 0 h to infinity (AUC(0-∞)) in participants with the c.935GA or the c.935AA genotype to those with the c.935GG genotype were 1.02 (0.87, 1.21) or 0.88 (0.71, 1.10), respectively (P=0.557). The geometric mean ratios (90% confidence interval) of aliskiren AUC(0-∞) in participants with the c.935GA or the c.935AA genotype to those with the c.935GG genotype were 0.98 (0.74, 1.30) or 1.24 (0.85, 1.80), respectively (P=0.576). CONCLUSION These data do not support the suggested functional significance of the SLCO2B1 c.935G>A SNP on OATP2B1 activity in vivo.
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Knauer MJ, Girdwood AJ, Kim RB, Tirona RG. Transport function and transcriptional regulation of a liver-enriched human organic anion transporting polypeptide 2B1 transcriptional start site variant. Mol Pharmacol 2013; 83:1218-28. [PMID: 23531488 DOI: 10.1124/mol.112.083618] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Human organic anion transporting polypeptide 2B1 (OATP2B1) is a membrane transporter that facilitates the cellular uptake of a number of endogenous compounds and drugs. OATP2B1 is widely expressed in tissues including the small intestine, liver, kidney, placenta, heart, skeletal muscle, and platelets. It was recently shown that differential promoter usage in tissues results in expression of five OATP2B1 transcriptional start site variants that use distinct first exons but share common subsequent exons. These variants are expected to encode either a full-length (OATP2B1-FL) or shortened protein lacking 22 N terminus amino acids (OATP2B1-Short). Little is known regarding the transport activity and regulation of OATP2B1 variants with N terminus truncation. Here, using absolute quantitative polymerase chain reaction, we find the full-length variant is the major form expressed in duodenum but the short variant predominates in liver. Using a transient heterologous cell expression system, we find that the transport activities of the short OATP2B1 variant toward substrates estrone sulfate and rosuvastatin are similar to the well characterized full-length variant. Transcriptional activity screening of the liver-enriched OATP2B1 variant promoter identified hepatocyte nuclear factor 4 α (HNF4α) as a novel transacting factor. With a combination of in silico screening, promoter mutation in cell-based reporter assays, small interfering RNA knockdown, and chromatin immunoprecipitation (ChIP) studies, we identified a functional HNF4α binding site close to the transcription start site (-17 to -4 bp). We conclude that the major OATP2B1 protein form in liver is transport competent and its hepatic expression is regulated by HNF4α.
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Affiliation(s)
- Michael J Knauer
- Department of Physiology and Pharmacology, The University of Western Ontario, London, Ontario, Canada
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Nassif A, Jia J, Keiser M, Oswald S, Modess C, Nagel S, Weitschies W, Hosten N, Siegmund W, Kühn JP. Visualization of hepatic uptake transporter function in healthy subjects by using gadoxetic acid-enhanced MR imaging. Radiology 2012; 264:741-50. [PMID: 22771883 DOI: 10.1148/radiol.12112061] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
PURPOSE To determine if genetic polymorphisms of liver-specific human organic anion transporting polypeptide (OATP) 1B1 and OATP1B3 influence cellular uptake of gadoxetic acid in vitro and if functionally relevant polymorphisms are confounders for liver enhancement by gadoxetic acid in healthy subjects. MATERIALS AND METHODS This study received ethics approval, and all subjects provided written informed consent. Cellular uptake of gadoxetic acid by OATP1B1 and OATP1B3 and their frequent genetic variants was measured by using stable transfected embryonic kidney HEK293 cells. Liver signal intensity at gadoxetic acid-enhanced MR imaging and pharmacokinetics of gadoxetic acid were evaluated in 36 healthy carriers of SLCO1B1/1B3 wild-type alleles (n = 10), SLCO1B1*1b/*1b (n = 8), SLCO1B1*15/*15 (n = 7), SLCO1B1*5/*15 (n = 1), SLCO1B1*1a/*5 (n = 6), and SLCO1B3*4/*4 (n = 4) by using T1-weighted MR imaging and liquid chromatography tandem mass spectrometry. RESULTS Transport activity for gadoxetic acid was increased in cells transfected with SLCO1B1c.388A>G (12.8 pmol/[mg·min]6 3.53, P = .001) but decreased in cells with SLCO1B1c.388A>G/521T>C (3.11 pmol/[mg·min] ± 0.918, P = .004) compared with cells with nonvariant transporter (6.32 pmol/[mg·min] ± 2.73). Compared with activity of cells transfected with the nonvariant SLCO1B3 (7.43 pmol/[mg·min] ± 2.43), SLCO1B3c.699G>A was a gain-of-function variant (15.1 pmol/[mg·min] ± 5.52, P = .002), whereas SLCO1B3c.334T>G (0.364 pmol/[mg·min] ± 0.125, P = .0001) and SLCO1B3c.1564G>T (0.295 pmol/[mg·min] ± 0.247, P = .0001) were variants with lower function. Liver enhancement with gadoxetic acid was reduced in subjects with OATP1B1*1a/*5 compared with wild-type subjects and those with OATP1B1*1b/*1b (area under enhancement curve, 3-480 minutes in arbitrary units [au]; 20.7 au ± 6.85 vs 36.5 au ± 8.08 [P = .006] vs 34.6 au ± 8.92 [P = .026]). The OATP1B3*4 polymorphism was not of functional relevance. No pharmacokinetic characteristics of gadoxetic acid were influenced by genetic polymorphisms of OATP1B1 and OATP1B3. CONCLUSION Liver-specific OATP1B1 and OATP1B3 are uptake carriers for gadoxetic acid in subjects. Genetic polymorphisms of OATP1B1 are signal confounders in gadoxetic acid-enhanced liver MR imaging.
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Affiliation(s)
- Ali Nassif
- Department of Clinical Pharmacology, Ernst-Moritz-Arndt University Greifswald, Ferdinand-Sauerbruch-Strasse NK, Greifswald D-17475, Germany
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Stieger B, Meier PJ. Pharmacogenetics of drug transporters in the enterohepatic circulation. Pharmacogenomics 2012; 12:611-31. [PMID: 21619426 DOI: 10.2217/pgs.11.53] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
This article summarizes the impact of the pharmacogenetics of drug transporters expressed in the enterohepatic circulation on the pharmacokinetics and pharmacodynamics of drugs. The role of pharmacogenetics in the function of drug transporter proteins in vitro is now well established and evidence is rapidly accumulating from in vivo pharmacokinetic studies, which suggests that genetic variants of drug transporter proteins can translate into clinically relevant phenotypes. However, a large amount of conflicting information on the clinical relevance of drug transporter proteins has so far precluded the emergence of a clear picture regarding the role of drug transporter pharmacogenetics in medical practice. This is very well exemplified by the case of P-glycoprotein (MDR1, ABCB1). The challenge is now to develop pharmacogenetic models with sufficient predictive power to allow for translation into drug therapy. This will require a combination of pharmacogenetics of drug transporters, drug metabolism and pharmacodynamics of the respective drugs.
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Affiliation(s)
- Bruno Stieger
- Division of Clinical Pharmacology & Toxicology, University Hospital, 8091 Zurich, Switzerland
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Hachad H, Overby CL, Argon S, Yeung CK, Ragueneau-Majlessi I, Levy RH. e-PKGene: a knowledge-based research tool for analysing the impact of genetics on drug exposure. Hum Genomics 2012; 5:506-15. [PMID: 21807605 PMCID: PMC3286185 DOI: 10.1186/1479-7364-5-5-506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
e-PKGene (www.pharmacogeneticsinfo.org) is a manually curated knowledge product developed in the Department of Pharmaceutics at the University of Washington, USA. The tool integrates information from the literature, public repositories, reference textbooks, product prescribing labels and clinical review sections of new drug approval packages. The database's easy-to-use web portal offers tools for visualisation, reporting and filtering of information. The database helps scientists to mine pharmacokinetic and pharmacodynamic information for drug-metabolising enzymes and transporters, and provides access to available quantitative information on drug exposure contained in the literature. It allows in-depth analysis of the impact of genetic variants of enzymes and transporters on pharmacokinetic responses to drugs and metabolites. This review gives a brief description of the database organisation, its search functionalities and examples of use.
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Affiliation(s)
- Houda Hachad
- Department of Pharmaceutics, University of Washington, Seattle, USA
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Chae YJ, Lee KR, Noh CK, Chong S, Kim DD, Shim CK, Chung SJ. Functional consequences of genetic variations in the human organic anion transporting polypeptide 1B3 (OATP1B3) in the Korean population. J Pharm Sci 2011; 101:1302-13. [PMID: 22147445 DOI: 10.1002/jps.23005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 10/18/2011] [Accepted: 11/11/2011] [Indexed: 01/09/2023]
Abstract
The objectives of this study were to investigate the allele frequencies and linkage disequilibrium (LD) in the organic anion transporting polypeptide 1B3 (OATP1B3) in the Korean population and to examine the functional consequences. Using samples from 48 Koreans, direct sequencing was carried out to determine the allele frequencies and LD of OATP1B3 in a representative Korean population. Thirty-six genetic variations in the transporter were found in Koreans; among them, five undocumented variations (i.e.,-6436G>C in the 5'-upstream region, 26A>C and 586A>G in the protein coding region, and IVS6-72A>T and IVS12-80A>T in intron regions) were identified. In the upstream region, -5035G>A was found to have lowered gene expression, as determined by a reporter gene assay, suggesting that this variation reduces the expression of OATP1B3 in humans. The functional relevance of the genetic variations in the protein coding region was determined by an uptake study involving representative substrates in human embryonic kidney 293 cells expressing wild type or variant forms. Variations involving 699G>A showed a reduced uptake activity for testosterone, but not for estradiol 17β-d-glucuronide or methotrexate, indicating that the functional impact of the variations is substrate specific. Considering the kinetic relevance of OATP1B3, the functionally affected variations may be therapeutically important.
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Affiliation(s)
- Yoon-Jee Chae
- Department of Pharmaceutics, College of Pharmacy, Seoul National University, Gwanak-gu, Seoul 151-742, Korea
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Abstract
Interindividual differences in drug transporter expression can result in variability in drug response. This variation in gene expression is determined, in part, by the actions of nuclear hormone receptors that act as xenobiotic- and endobiotic-sensing transcription factors. Among the ligand-activated nuclear receptors, signaling through the pregnane X receptor (PXR), constitutive androstane receptor (CAR), farnesoid X receptor (FXR), and vitamin D receptor (VDR) constitute major pathways regulating drug transporter expression in tissues. Hence, these endobiotic- and xenobiotic-sensing nuclear receptors are intrinsically involved in environmental influences of drug response. Moreover, because nuclear receptor genes are polymorphic, these transcription factors are also thought to contribute to heritability of variable drug action. In this chapter, the molecular aspects of drug transporter gene regulation by ligand-activated nuclear receptors will be reviewed including their clinical relevance.
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Pollex EK, Hutson JR. Genetic polymorphisms in placental transporters: implications for fetal drug exposure to oral antidiabetic agents. Expert Opin Drug Metab Toxicol 2011; 7:325-39. [DOI: 10.1517/17425255.2011.553188] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Niemi M, Pasanen MK, Neuvonen PJ. Organic anion transporting polypeptide 1B1: a genetically polymorphic transporter of major importance for hepatic drug uptake. Pharmacol Rev 2011; 63:157-81. [PMID: 21245207 DOI: 10.1124/pr.110.002857] [Citation(s) in RCA: 463] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The importance of membrane transporters for drug pharmacokinetics has been increasingly recognized during the last decade. Organic anion transporting polypeptide 1B1 (OATP1B1) is a genetically polymorphic influx transporter expressed on the sinusoidal membrane of human hepatocytes, and it mediates the hepatic uptake of many endogenous compounds and xenobiotics. Recent studies have demonstrated that OATP1B1 plays a major, clinically important role in the hepatic uptake of many drugs. A common single-nucleotide variation (coding DNA c.521T>C, protein p.V174A, rs4149056) in the SLCO1B1 gene encoding OATP1B1 decreases the transporting activity of OATP1B1, resulting in markedly increased plasma concentrations of, for example, many statins, particularly of active simvastatin acid. The variant thereby enhances the risk of statin-induced myopathy and decreases the therapeutic indexes of statins. However, the effect of the SLCO1B1 c.521T>C variant is different on different statins. The same variant also markedly affects the pharmacokinetics of several other drugs. Furthermore, certain SLCO1B1 variants associated with an enhanced clearance of methotrexate increase the risk of gastrointestinal toxicity by methotrexate in the treatment of children with acute lymphoblastic leukemia. Certain drugs (e.g., cyclosporine) potently inhibit OATP1B1, causing clinically significant drug interactions. Thus, OATP1B1 plays a major role in the hepatic uptake of drugs, and genetic variants and drug interactions affecting OATP1B1 activity are important determinants of individual drug responses. In this article, we review the current knowledge about the expression, function, substrate characteristics, and pharmacogenetics of OATP1B1 as well as its role in drug interactions, in parts comparing with those of other hepatocyte-expressed organic anion transporting polypeptides, OATP1B3 and OATP2B1.
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Affiliation(s)
- Mikko Niemi
- Department of Clinical Pharmacology, University of Helsinki, PO Box 20, Helsinki, FI-00014, Finland.
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Fahrmayr C, Fromm MF, König J. Hepatic OATP and OCT uptake transporters: their role for drug-drug interactions and pharmacogenetic aspects. Drug Metab Rev 2010; 42:380-401. [PMID: 20100011 DOI: 10.3109/03602530903491683] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Uptake transporters in the basolateral membrane of hepatocytes are important for the hepatobiliary elimination of drugs. Further, since drug-metabolizing enzymes are located intracellularly, uptake into hepatocytes is a prerequisite for their subsequent metabolism. Therefore, alteration of uptake transporter function (e.g., by concomitantly administered drugs or due to functional consequences of genetic variations, leading to reduced transport function) may result in a change in drug pharmacokinetics. In this review, we focus on the hepatocellularly expressed members of the OATP and OCT family, their impact on transport-mediated drug-drug interactions, and on the functional consequences of variations in genes encoding these transporters.
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Affiliation(s)
- Christina Fahrmayr
- Department of Clinical Pharmacology and Clinical Toxicology, Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-University Erlangen-Nuremberg, Germany
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Ogasawara K, Terada T, Katsura T, Hatano E, Ikai I, Yamaoka Y, Inui KI. Hepatitis C virus-related cirrhosis is a major determinant of the expression levels of hepatic drug transporters. Drug Metab Pharmacokinet 2010; 25:190-9. [PMID: 20460825 DOI: 10.2133/dmpk.25.190] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Hepatic drug transporters are responsible for both hepatic uptake and the biliary excretion of drugs. Expression changes in hepatic drug transporter genes have been observed in various pathophysiological conditions. However, it has not been comprehensively investigated what factors substantially influence the mRNA levels of hepatic drug transporters. In this study, we quantified the mRNA expression of 17 drug transporters using noncancerous liver tissue samples and carried out stepwise multiple regression analysis to identify the factors affecting their expression from 18 clinical variables. For 17 drug transporters, the mRNA level of organic anion transporting polypeptide (OATP) 2B1 was highest, followed by that of organic cation transporter 1, organic anion transporter 2, OATP1B1, OATP1B3, multidrug resistance-associated protein (MRP) 6, and MRP3. Stepwise multiple regression analysis demonstrated MRP4 mRNA level to be predicted with the greatest accuracy among 17 drug transporters. Of clinical variables entered into the prediction model for MRP4, hepatitis C virus (HCV) infection and liver cirrhosis were crucial factors affecting MRP4 mRNA and protein levels. Furthermore, HCV-related cirrhosis influenced the mRNA levels of 8 drug transporters besides MRP4. These findings indicate that HCV-related cirrhosis is a crucial factor affecting the expression of hepatic drug transporters, especially MRP4.
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Affiliation(s)
- Ken Ogasawara
- Department of Pharmacy, Kyoto University Hospital, Japan
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Leonhardt M, Keiser M, Oswald S, Kühn J, Jia J, Grube M, Kroemer HK, Siegmund W, Weitschies W. Hepatic uptake of the magnetic resonance imaging contrast agent Gd-EOB-DTPA: role of human organic anion transporters. Drug Metab Dispos 2010; 38:1024-8. [PMID: 20406852 DOI: 10.1124/dmd.110.032862] [Citation(s) in RCA: 187] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Contrast-enhancing magnetic resonance imaging with the liver-specific agent gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA) has been shown to improve the detection rate of focal lesions. There is evidence from preclinical studies that multidrug organic anion transporters are involved in hepatic uptake of Gd-EOB-DTPA. Therefore, we evaluated affinity of the contrast agent to human organic anion-transporting polypeptides (OATP1B1, OATP1B3, OATP2B1) and to the Na(+)/taurocholate cotransporting polypeptide (NTCP) using stable transfected human embryonic kidney (HEK) 293 cells. In competition assays, Gd-EOB-DTPA inhibited the uptake of bromosulfophthalein (BSP) by OATP1B1 (IC(50) = 0.6 mM) and OATP1B3 (IC(50) = 0.4 mM). In comparison, the IC(50) values for rifampicin were 11.9 (OATP1B1), 1.4 (OATP1B3), and 80.5 muM (OATP2B1), respectively. Uptake of BSP by OATP2B1, uptake of taurocholic acid by NTCP, and viability of all HEK cells were not influenced by Gd-EOB-DTPA in concentrations up to 10 mM. In uptake assays using a new liquid chromatography-tandem mass spectrometry method for quantification, Gd-EOB-DTPA was a substrate for OATP1B1 (K(m) = 0.7 mM, V(max) = 10.5 pmol/mg x min), OATP1B3 (K(m) = 4.1 mM, V(max) = 22.7 pmol/mg x min), and NTCP (K(m) = 0.04 mM, V(max) = 1.4 pmol/mg x min). The uptake by OATP2B1 was not different from the vector control. In conclusion, Gd-EOB-DTPA is a substrate of the liver-specific OATP1B1, OATP1B3, and NTCP.
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Affiliation(s)
- Mirko Leonhardt
- Department of Pharmacy, Ernst-Moritz-Arndt-University of Greifswald, Greifswald, Germany
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