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Santhanes D, Zhang H, Wilkins A, John Aitken R, Gannon AL, Liang M. Engineering pH-sensitive dissolution of lipid-polymer nanoparticles by Eudragit integration impacts plasmid DNA (pDNA) transfection. Eur J Pharm Biopharm 2024; 199:114299. [PMID: 38643953 DOI: 10.1016/j.ejpb.2024.114299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 04/06/2024] [Accepted: 04/18/2024] [Indexed: 04/23/2024]
Abstract
Lipid-polymer nanoparticles offer a promising strategy for improving gene nanomedicines by combining the benefits of biocompatibility and stability associated with the individual systems. However, research to date has focused on poly-lactic-co-glycolic acid (PLGA) and resulted in inefficient transfection. In this study, biocompatible Eudragit constructs E100 and RS100 were formulated as lipid-polymer nanoparticles loaded with pDNA expressing red fluorescent protein (RFP) as a model therapeutic. Using a facile nanoprecipitation technique, a core-shell structure stabilised by lipid-polyethylene glycol (PEG) surfactant was produced and displayed resistance to ultracentrifugation. Both cationic polymers E100 (pH-sensitive dissolution at 5) and RS100 (pH-insensitive dissolution) produced 150-200 nm sized particles with a small positive surface charge (+3-5 mV) and high pDNA encapsulation efficiencies (EE) of 75-90%. The dissolution properties of the Eudragit polymers significantly impacted the biological performance in human embryonic kidney cells (HEK293T). Nanoparticles composed of polymer RS100 resulted in consistently high cell viability (80-100%), whereas polymer E100 demonstrated dose-dependent behaviour (20-90% cell viability). The low dissolution of polymer RS100 over the full pH range and the resulting nanoparticles failed to induce RFP expression in HEK293T cells. In contrast, polymer E100-constructed nanoparticles resulted in reproducible and gradually increasing RFP expression of 26-42% at 48-72 h. Intraperitoneal (IP) injection of the polymer E100-based nanoparticles in C57BL/6 mice resulted in targeted RFP expression in mouse testes with favourable biocompatibility one-week post-administration. These findings predicate Eudragit based lipid-polymer nanoparticles as a novel and effective carrier for nucleic acids, which could facilitate pre-clinical evaluation and translation of gene nanomedicines.
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Affiliation(s)
- Diviya Santhanes
- School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Huiming Zhang
- Electron Microscopy and X-ray Unit, Research and Innovation Division, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Alex Wilkins
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Robert John Aitken
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Anne-Louise Gannon
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Mingtao Liang
- School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia.
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2
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Kaci H, Bakos É, Needs PW, Kroon PA, Valentová K, Poór M, Özvegy-Laczka C. The 2-aminoethyl diphenylborinate-based fluorescent method identifies quercetin and luteolin metabolites as substrates of Organic anion transporting polypeptides, OATP1B1 and OATP2B1. Eur J Pharm Sci 2024; 196:106740. [PMID: 38437885 DOI: 10.1016/j.ejps.2024.106740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/28/2024] [Accepted: 03/01/2024] [Indexed: 03/06/2024]
Abstract
Organic anion transporting polypeptides (OATPs), OATP1B1 and OATP2B1 are membrane proteins mediating the cellular uptake of chemically diverse organic compounds. OATP1B1 is exclusively expressed in hepatocytes and plays a key role in hepatic detoxification. The ubiquitously expressed OATP2B1 promotes the intestinal absorption of orally administered drugs. Flavonoids are widely found in foods and beverages, and many of them can inhibit OATP function, resulting in food-drug interactions. In our previous work, we have shown that not only luteolin (LUT) and quercetin (Q), but also some of their metabolites can inhibit OATP1B1 and OATP2B1 activity. However, data about the potential direct transport of these flavonoids by OATPs have been incomplete. Hence, in the current study, we developed a simple, fluorescence-based method for the measurement of intracellular flavonoid levels. The method applies a cell-permeable small molecule (2-aminoethyl diphenylborinate, 2-APB), that, upon forming a complex with flavonoids, results in their fluorescence enhancement. This way the direct uptake of LUT and Q, and also their metabolites' could be investigated both by confocal microscopy and in a fluorescence plate reader in living cells. With this approach we identified quercetin-3'-O-sulfate, luteolin-3'-O-glucuronide, luteolin-7-O-glucuronide and luteolin-3'-O-sulfate as substrates of both OATP1B1 and OATP2B1. Our results highlight that OATP1B1 and OATP2B1 can be key participants in the transmembrane movement of LUT and Q conjugates with otherwise low cell permeability. In addition, the novel method developed in this study can be a good completion to existing fluorescence-based assays to investigate OATP function.
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Affiliation(s)
- Hana Kaci
- Institute of Molecular Life Sciences, RCNS, HUN-REN, H-1117 Budapest, Magyar tudósok krt. 2., Hungary; Doctoral School of Biology, Institute of Biology, ELTE Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/C, Hungary
| | - Éva Bakos
- Institute of Molecular Life Sciences, RCNS, HUN-REN, H-1117 Budapest, Magyar tudósok krt. 2., Hungary
| | - Paul W Needs
- Food, Microbiome & Health Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, Norfolk NR4 7UQ, UK
| | - Paul A Kroon
- Food, Microbiome & Health Programme, Quadram Institute Bioscience, Norwich Research Park, Norwich, Norfolk NR4 7UQ, UK
| | - Kateřina Valentová
- Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, Prague CZ-142 00, Czech Republic
| | - Miklós Poór
- Molecular Medicine Research Group, János Szentágothai Research Centre, University of Pécs, Ifjúság útja 20, Pécs H-7624, Hungary; Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Rókus u. 2, Pécs H-7624, Hungary; Department of Laboratory Medicine, Medical School, University of Pécs, Ifjúság útja 13, Pécs H-7624, Hungary
| | - Csilla Özvegy-Laczka
- Institute of Molecular Life Sciences, RCNS, HUN-REN, H-1117 Budapest, Magyar tudósok krt. 2., Hungary.
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3
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Kwon J, Kim MS, Blagojevic C, Mailloux J, Medwid S, Tirona RG, Wang R, Schwarz UI. Differential effects of OATP2B1 on statin accumulation and toxicity in a beta cell model. Toxicol Mech Methods 2024; 34:130-147. [PMID: 37771097 DOI: 10.1080/15376516.2023.2262568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 09/19/2023] [Indexed: 09/30/2023]
Abstract
An increased risk of new-onset diabetes mellitus has been recently reported for statin therapy, and experimental studies have shown reduced glucose-stimulated insulin secretion (GSIS) and mitochondrial dysfunction in beta cells with effects differing among agents. Organic anion transporting polypeptide (OATP) 2B1 contributes to hepatic uptake of rosuvastatin, atorvastatin and pravastatin, three known substrates. Since OATP2B1 is present in beta cells of the human pancreas, we investigated if OATP2B1 facilitates the local accumulation of statins in a rat beta cell model INS-1 832/13 (INS-1) thereby amplifying statin-induced toxicity. OATP2B1 overexpression in INS-1 cells via adenoviral transduction showed 2.5-, 1.8- and 1.4-fold higher cellular retention of rosuvastatin, atorvastatin and pravastatin, respectively, relative to LacZ control, while absolute intracellular concentration was about twice as high for the lipophilic atorvastatin compared to the more hydrophilic rosuvastatin and pravastatin. After 24 h statin treatment at high concentrations, OATP2B1 enhanced statin toxicity involving activation of intrinsic apoptosis (caspase 3/7 activation) and mitochondrial dysfunction (NADH dehydrogenase activity) following rosuvastatin and atorvastatin, which was partly reversed by isoprenoids. OATP2B1 had no effect on statin-induced reduction in GSIS, mitochondrial electron transport chain complex expression or caspase 9 activation. We confirmed a dose-dependent reduction in insulin secretion by rosuvastatin and atorvastatin in native INS-1 with a modest change in cellular ATP. Collectively, our results indicate a role of OATP2B1, which is abundant in human beta cells, in statin accumulation and statin-induced toxicity but not insulin secretion of rosuvastatin and atorvastatin in INS-1 cells.
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Affiliation(s)
- Jihoon Kwon
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Michelle S Kim
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Christina Blagojevic
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Jaymie Mailloux
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Samantha Medwid
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Rommel G Tirona
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Rennian Wang
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Ute I Schwarz
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
- Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
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4
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Bashiardes S, Christodoulou C. Orally Administered Drugs and Their Complicated Relationship with Our Gastrointestinal Tract. Microorganisms 2024; 12:242. [PMID: 38399646 PMCID: PMC10893523 DOI: 10.3390/microorganisms12020242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/18/2024] [Accepted: 01/22/2024] [Indexed: 02/25/2024] Open
Abstract
Orally administered compounds represent the great majority of all pharmaceutical compounds produced for human use and are the most popular among patients since they are practical and easy to self-administer. Following ingestion, orally administered drugs begin a "perilous" journey down the gastrointestinal tract and their bioavailability is modulated by numerous factors. The gastrointestinal (GI) tract anatomy can modulate drug bioavailability and accounts for interpatient drug response heterogeneity. Furthermore, host genetics is a contributor to drug bioavailability modulation. Importantly, a component of the GI tract that has been gaining notoriety with regard to drug treatment interactions is the gut microbiota, which shares a two-way interaction with pharmaceutical compounds in that they can be influenced by and are able to influence administered drugs. Overall, orally administered drugs are a patient-friendly treatment option. However, during their journey down the GI tract, there are numerous host factors that can modulate drug bioavailability in a patient-specific manner.
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Affiliation(s)
- Stavros Bashiardes
- Molecular Virology Department, Cyprus Institute of Neurology and Genetics, Iroon Avenue 6, Nicosia 2371, Cyprus;
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5
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Kinzi J, Hussner J, Schäfer AM, Treyer A, Seibert I, Tillmann A, Mueller V, Gherardi C, Vonwyl C, Hamburger M, Meyer Zu Schwabedissen HE. Influence of Slco2b1-knockout and SLCO2B1-humanization on coproporphyrin I and III levels in rats. Br J Pharmacol 2024; 181:36-53. [PMID: 37533302 DOI: 10.1111/bph.16205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 03/15/2023] [Accepted: 07/20/2023] [Indexed: 08/04/2023] Open
Abstract
BACKGROUND AND PURPOSE Coproporphyrin (CP) I and III are byproducts of haem synthesis currently investigated as biomarkers for drug-drug interactions involving hepatic organic anion transporting polypeptide (OATP) 1B transporters. Another hepatically expressed OATP-member is OATP2B1. The aim of this study was to test the impact of OATP2B1, which specifically transports CPIII, on CP serum levels, applying novel rat models. EXPERIMENTAL APPROACH CPIII transport kinetics and the interplay between OATP2B1 and multidrug resistance-associated proteins (MRPs) were determined in vitro using the vTF7 expression system. Novel rSlco2b1-/- and SLCO2B1+/+ rat models were characterized for physiological parameters and for CP serum levels. Hepatic and renal expression of transporters involved in CP disposition were determined by real-time qPCR, Western blot analysis, and immunohistochemistry. KEY RESULTS In vitro experiments revealed differences in transport kinetics comparing human and rat OATP2B1 and showed a consistent, species-specific interplay with hMRP3/rMRP3. Deletion of rOATP2B1 was associated with a trend towards lower CPI serum levels compared with wildtype rats, while CPIII remained unchanged. Comparing SLCO2B1+/+ with knockout rats revealed an effect of sex: only in females the genetic modification influenced CP serum levels. Analysis of hepatic and renal transporters revealed marginal, but in part, statistically significant differences in rMRP2 abundance, which may contribute to the observed changes in CP serum levels. CONCLUSION AND IMPLICATIONS Our findings support that factors other than OATP1B transporters are of relevance for basal CP levels. Only in female rats, humanization of SLCO2B1 affects basal CPI and CPIII serum levels, despite isomer selectivity of OATP2B1.
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Affiliation(s)
- Jonny Kinzi
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Janine Hussner
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Anima M Schäfer
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Andrea Treyer
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Isabell Seibert
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Annika Tillmann
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Vanessa Mueller
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Clarisse Gherardi
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Celina Vonwyl
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Matthias Hamburger
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
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6
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Zheng E, Madura P, Grandos J, Broncel M, Pawlos A, Woźniak E, Gorzelak-Pabiś P. When the same treatment has different response: The role of pharmacogenomics in statin therapy. Biomed Pharmacother 2024; 170:115966. [PMID: 38061135 DOI: 10.1016/j.biopha.2023.115966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 11/22/2023] [Accepted: 11/27/2023] [Indexed: 01/10/2024] Open
Abstract
Statins, also known as HMG-CoA reductase inhibitors, are one of the most potently prescribed and thoroughly researched medications, predominantly utilized for managing cardiovascular diseases by modulating serum cholesterol levels. Despite the well-documented efficacy of statins in reducing overall mortality via attenuating the risk of cardiovascular diseases, notable interindividual variability in therapeutic responses persists as such variability could compromise the lipid-lowering efficacy of the drug, potentially increasing susceptibility to adverse effects or attenuating therapeutic outcomes.This phenomenon has catalysed a growing interest in the scientific community to explore common genetic polymorphisms within genes that encode for pivotal enzymes within the pharmacokinetic pathways of statins. In our review, we focus to provide insight into potentially clinically relevant polymorphisms associated with statins' pharmacokinetic participants and assess their consequent implications on modulating the therapeutic outcomes of statins among distinct genetic carrier.
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Affiliation(s)
- Edward Zheng
- Dept. of Internal Diseases and Clinical Pharmacology, The Laboratory of Tissue Immunopharmacology, Medical University of Lodz, Poland
| | - Paulina Madura
- Dept. of Internal Diseases and Clinical Pharmacology, The Laboratory of Tissue Immunopharmacology, Medical University of Lodz, Poland
| | - Jakub Grandos
- Dept. of Internal Diseases and Clinical Pharmacology, The Laboratory of Tissue Immunopharmacology, Medical University of Lodz, Poland
| | - Marlena Broncel
- Dept. of Internal Diseases and Clinical Pharmacology, The Laboratory of Tissue Immunopharmacology, Medical University of Lodz, Poland
| | - Agnieszka Pawlos
- Dept. of Internal Diseases and Clinical Pharmacology, The Laboratory of Tissue Immunopharmacology, Medical University of Lodz, Poland
| | - Ewelina Woźniak
- Dept. of Internal Diseases and Clinical Pharmacology, The Laboratory of Tissue Immunopharmacology, Medical University of Lodz, Poland
| | - Paulina Gorzelak-Pabiś
- Dept. of Internal Diseases and Clinical Pharmacology, The Laboratory of Tissue Immunopharmacology, Medical University of Lodz, Poland.
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7
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Yajima K, Akiyoshi T, Sakamoto K, Suzuki Y, Oka T, Imaoka A, Yamamura H, Kurokawa J, Ohtani H. Determination of single-molecule transport activity of OATP2B1 by measuring the number of transporter molecules using electrophysiological approach. J Pharmacol Sci 2023; 153:153-160. [PMID: 37770156 DOI: 10.1016/j.jphs.2023.08.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 08/12/2023] [Accepted: 08/29/2023] [Indexed: 10/03/2023] Open
Abstract
Transporter-mediated clearance is determined by two factors, its single-molecule clearance, and expression level. However, no reliable method has been developed to evaluate them separately. This study aimed to develop a reliable method for evaluating the single-molecule activity of membrane transporters, such as organic anion transporting polypeptide (OATP) 2B1. HEK293 cells that co-expressed large conductance calcium-activated potassium (BK) channel and OATP2B1 were established and used for the following experiments. i) BK channel-mediated whole-cell conductance was measured using patch-clamp technique and divided by its unitary conductance to estimate the number of channels on plasma membrane (QI). ii) Using plasma membrane fraction, quantitative targeted absolute proteomics determined the stoichiometric ratio (ρ) of OATP2B1 to BK channel. iii) The uptake of estrone 3-sulfate was evaluated to calculate the Michaelis constant and uptake clearance (CL) per cell. Single-molecule clearance (CLint) was calculated by dividing CL by QI·ρ. QI and ρ values were estimated to be 916 and 2.16, respectively, yielding CLint of 5.23 fL/min/molecule. We successfully developed a novel method to reliably measure the single-molecule activity of a transporter, which could be used to evaluate the influences of factors such as genetic variations and post-translational modifications on the intrinsic activity of transporters.
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Affiliation(s)
- Kodai Yajima
- Division of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30, Shibakoen Minato-ku, Tokyo, 105-8512, Japan.
| | - Takeshi Akiyoshi
- Division of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30, Shibakoen Minato-ku, Tokyo, 105-8512, Japan; Department of Clinical Pharmacy, School of Medicine, Keio University, 35, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Kazuho Sakamoto
- Department of Bio-Informational Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka-shi, Shizuoka, 422-8526, Japan.
| | - Yoshiaki Suzuki
- Department of Molecular and Cellular Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabedori, Mizuho-ku, Nagoya, 467-8603, Japan.
| | - Takayuki Oka
- Nanion Technologies Japan K.K., Tokyo Laboratory, Wakamatsu-cho, Shinjuku-ku, Tokyo, 162-0056, Japan.
| | - Ayuko Imaoka
- Division of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30, Shibakoen Minato-ku, Tokyo, 105-8512, Japan.
| | - Hisao Yamamura
- Department of Molecular and Cellular Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabedori, Mizuho-ku, Nagoya, 467-8603, Japan.
| | - Junko Kurokawa
- Department of Bio-Informational Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka-shi, Shizuoka, 422-8526, Japan.
| | - Hisakazu Ohtani
- Division of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30, Shibakoen Minato-ku, Tokyo, 105-8512, Japan; Department of Clinical Pharmacy, School of Medicine, Keio University, 35, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan; Department of Pharmacy, Keio University Hospital, 35, Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
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8
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Kinzi J, Grube M, Hussner J, Seibert I, Hamburger M, Meyer Zu Schwabedissen HE. The influence of OATP2B1 and atorvastatin on coproporphyrin isomers in rats. J Pharmacol Sci 2023; 153:170-174. [PMID: 37770158 DOI: 10.1016/j.jphs.2023.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/04/2023] [Accepted: 09/11/2023] [Indexed: 10/03/2023] Open
Abstract
Coproporphyrin I (CPI) and III (CPIII) are discussed as biomarkers for organic anion transporting polypeptides (OATPs). We report on CPI and CPIII levels in wildtype, rSlco2b1-knockout, and SLCO2B1-humanized rats at baseline and after administration of atorvastatin, an inhibitor of the CPIII-specific rOATP2B1/hOATP2B1 and the CPI/CPIII-transporting rOATP1B2. OATP-inhibition by atorvastatin leads to significantly increased CPI and CPIII serum levels. However, basal CP serum levels in rSlco2b1-knockout animals were significantly lower (CPI), or unaffected (CPIII). In the presence of atorvastatin, this genotype effect was abolished. In conclusion, our results indicate an unexpected impact of OATP2B1 on CP serum levels in rats.
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Affiliation(s)
- Jonny Kinzi
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Markus Grube
- Center of Drug Absorption and Transport, Institute for Pharmacology, University Medicine Greifswald, Felix-Hausdorff-Str. 3, 17487 Greifswald, Germany
| | - Janine Hussner
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Isabell Seibert
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Matthias Hamburger
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
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9
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Unlu G, Prizer B, Erdal R, Yeh HW, Bayraktar EC, Birsoy K. Metabolic-scale gene activation screens identify SLCO2B1 as a heme transporter that enhances cellular iron availability. Mol Cell 2022; 82:2832-2843.e7. [PMID: 35714613 PMCID: PMC9356996 DOI: 10.1016/j.molcel.2022.05.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 04/14/2022] [Accepted: 05/18/2022] [Indexed: 11/16/2022]
Abstract
Iron is the most abundant transition metal essential for numerous cellular processes. Although most mammalian cells acquire iron through transferrin receptors, molecular players of iron utilization under iron restriction are incompletely understood. To address this, we performed metabolism-focused CRISPRa gain-of-function screens, which revealed metabolic limitations under stress conditions. Iron restriction screens identified not only expected members of iron utilization pathways but also SLCO2B1, a poorly characterized membrane carrier. SLCO2B1 expression is sufficient to increase intracellular iron, bypass the essentiality of the transferrin receptor, and enable proliferation under iron restriction. Mechanistically, SLCO2B1 mediates heme analog import in cellular assays. Heme uptake by SLCO2B1 provides sufficient iron for proliferation through heme oxygenases. Notably, SLCO2B1 is predominantly expressed in microglia in the brain, and primary Slco2b1-/- mouse microglia exhibit strong defects in heme analog import. Altogether, our work identifies SLCO2B1 as a microglia-enriched plasma membrane heme importer and provides a genetic platform to identify metabolic limitations under stress conditions.
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Affiliation(s)
- Gokhan Unlu
- Laboratory of Metabolic Regulation and Genetics, The Rockefeller University, New York, NY 10065, USA
| | - Benjamin Prizer
- Laboratory of Metabolic Regulation and Genetics, The Rockefeller University, New York, NY 10065, USA
| | - Ranya Erdal
- Laboratory of Metabolic Regulation and Genetics, The Rockefeller University, New York, NY 10065, USA; Medical Scientist Training Program, Hacettepe University Faculty of Medicine, Ankara 06230, Turkey
| | - Hsi-Wen Yeh
- Laboratory of Metabolic Regulation and Genetics, The Rockefeller University, New York, NY 10065, USA
| | - Erol C Bayraktar
- Laboratory of Metabolic Regulation and Genetics, The Rockefeller University, New York, NY 10065, USA
| | - Kıvanç Birsoy
- Laboratory of Metabolic Regulation and Genetics, The Rockefeller University, New York, NY 10065, USA.
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10
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Zamek-Gliszczynski MJ, Sangha V, Shen H, Feng B, Wittwer MB, Varma MVS, Liang X, Sugiyama Y, Zhang L, Bendayan R. Transporters in drug development: International transporter consortium update on emerging transporters of clinical importance. Clin Pharmacol Ther 2022; 112:485-500. [PMID: 35561119 DOI: 10.1002/cpt.2644] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 05/08/2022] [Indexed: 11/07/2022]
Abstract
During its 4th transporter workshop in 2021, the International Transporter Consortium (ITC) provided updates on emerging clinically relevant transporters for drug development. Previously highlighted and new transporters were considered based on up-to-date clinical evidence of their importance in drug-drug interactions and potential for altered drug efficacy and safety, including drug-nutrient interactions leading to nutrient deficiencies. For the first time, folate transport pathways (PCFT, RFC, and FRα) were examined in-depth as a potential mechanism of drug-induced folate deficiency and related toxicities (e.g., neural tube defects, megaloblastic anemia). However, routine toxicology studies conducted in support of drug development appear sufficient to flag such folate deficiency toxicities, while prospective prediction from in vitro folate metabolism and transport inhibition is not well enough established to inform drug development. Previous suggestion of retrospective study of intestinal OATP2B1 inhibition to explain unexpected decreases in drug exposure were updated. Furthermore, when the absorption of a new molecular entity is more rapid and extensive than can be explained by passive permeability, evaluation of OATP2B1 transport may be considered. Emerging research on hepatic and renal OAT2 is summarized, but current understanding of the importance of OAT2 was deemed insufficient to justify specific consideration for drug development. Hepatic, renal, and intestinal MRPs (MRP2, MRP3, MRP4) were revisited. MRPs may be considered when they are suspected to be the major determinant of drug disposition (e.g., direct glucuronide conjugates); MRP2 inhibition as a mechanistic explanation for drug-induced hyperbilirubinemia remains justified. There were no major changes in recommendations from previous ITC whitepapers.
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Affiliation(s)
| | - Vishal Sangha
- Department of Pharmaceutical Sciences, University of Toronto, Leslie Dan Faculty of Pharmacy, 144 College Street, Toronto, ON, M5S 3M2, Canada
| | - Hong Shen
- Drug Metabolism and PK, Bristol Myers Squibb Company, Route 206 & Province Line Road, Princeton, NJ, 08543, USA
| | - Bo Feng
- Drug Metabolism and PK, Vertex Pharmaceuticals, Inc, 50 Northern Avenue, Boston, MA, 02210, USA
| | - Matthias B Wittwer
- Roche Pharma Research and Early Development, Pharmaceutical Sciences, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd, Grenzacherstrasse 124, CH-4070, Basel, Switzerland
| | - Manthena V S Varma
- PK, Dynamics and Metabolism, Medicine Design, Pfizer Inc, Worldwide R&D, Groton, CT, 06340, USA
| | - Xiaomin Liang
- Drug Metabolism, Gilead Sciences, Inc, 333 Lakeside Drive, Foster City, CA, 94404, USA
| | - Yuichi Sugiyama
- Laboratory of Quantitative System PK/Pharmacodynamics, School of Pharmacy, Josai International University, Kioicho Campus, Tokyo, 102-0093, Japan
| | - Lei Zhang
- Office of Research and Standards, Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, 10903 New Hampshire Ave, Silver Spring, MD, 20993, USA
| | - Reina Bendayan
- Department of Pharmaceutical Sciences, University of Toronto, Leslie Dan Faculty of Pharmacy, 144 College Street, Toronto, ON, M5S 3M2, Canada
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