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Jiang L, Sun XY, Wang SQ, Liu YL, Lu LJ, Wu WH, Zhi H, Wang ZY, Liu XD, Liu L. Indoxyl sulphate-TNFα axis mediates uremic encephalopathy in rodent acute kidney injury. Acta Pharmacol Sin 2024; 45:1406-1424. [PMID: 38589687 PMCID: PMC11192958 DOI: 10.1038/s41401-024-01251-6] [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: 10/18/2023] [Accepted: 02/26/2024] [Indexed: 04/10/2024] Open
Abstract
Acute kidney injury (AKI) is often accompanied by uremic encephalopathy resulting from accumulation of uremic toxins in brain possibly due to impaired blood-brain barrier (BBB) function. Anionic uremic toxins are substrates or inhibitors of organic anionic transporters (OATs). In this study we investigated the CNS behaviors and expression/function of BBB OAT3 in AKI rats and mice, which received intraperitoneal injection of cisplatin 8 and 20 mg/kg, respectively. We showed that cisplatin treatment significantly inhibited the expressions of OAT3, synaptophysin and microtubule-associated protein 2 (MAP2), impaired locomotor and exploration activities, and increased accumulation of uremic toxins in the brain of AKI rats and mice. In vitro studies showed that uremic toxins neither alter OAT3 expression in human cerebral microvascular endothelial cells, nor synaptophysin and MAP2 expressions in human neuroblastoma (SH-SY5Y) cells. In contrast, tumour necrosis factor alpha (TNFα) and the conditioned medium (CM) from RAW264.7 cells treated with indoxyl sulfate (IS) significantly impaired OAT3 expression. TNFα and CM from IS-treated BV-2 cells also inhibited synaptophysin and MAP2 expressions in SH-SY5Y cells. The alterations caused by TNFα and CMs in vitro, and by AKI and TNFα in vivo were abolished by infliximab, a monoclonal antibody designed to intercept and neutralize TNFα, suggesting that AKI impaired the expressions of OAT3, synaptophysin and MAP2 in the brain via IS-induced TNFα release from macrophages or microglia (termed as IS-TNFα axis). Treatment of mice with TNFα (0.5 mg·kg-1·d-1, i.p. for 3 days) significantly increased p-p65 expression and reduced the expressions of Nrf2 and HO-1. Inhibiting NF-κB pathway, silencing p65, or activating Nrf2 and HO-1 obviously attenuated TNFα-induced downregulation of OAT3, synaptophysin and MAP2 expressions. Significantly increased p-p65 and decreased Nrf2 and HO-1 protein levels were also detected in brain of AKI mice and rats. We conclude that AKI inhibits the expressions of OAT3, synaptophysin and MAP2 due to IS-induced TNFα release from macrophages or microglia. TNFα impairs the expressions of OAT3, synaptophysin and MAP2 partly via activating NF-κB pathway and inhibiting Nrf2-HO-1 pathway.
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Affiliation(s)
- Ling Jiang
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Xue-Ying Sun
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Si-Qian Wang
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Yan-Lin Liu
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Ling-Jue Lu
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Wen-Han Wu
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Hao Zhi
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Zhong-Yan Wang
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China
| | - Xiao-Dong Liu
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China.
| | - Li Liu
- Center of Drug Metabolism and Pharmacokinetics, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, China.
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Okamura T, Kikuchi T, Ogawa M, Zhang MR. Improved synthesis of 6-bromo-7-[ 11C]methylpurine for clinical use. EJNMMI Radiopharm Chem 2024; 9:10. [PMID: 38334858 PMCID: PMC10857989 DOI: 10.1186/s41181-024-00240-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 01/25/2024] [Indexed: 02/10/2024] Open
Abstract
BACKGROUND Multidrug resistance-associated protein 1 (MRP1), an energy-dependent efflux pump, is expressed widely in various tissues and contributes to many physiological and pathophysiological processes. 6-Bromo-7-[11C]methylpurine ([11C]7m6BP) is expected to be useful for the assessment of MRP1 activity in the human brain and lungs. However, the radiochemical yield (RCY) in the synthesis of [11C]7m6BP was low, limiting its clinical application, because the methylation of the precursor with [11C]CH3I provided primarily the undesired isomer, 6-bromo-9-[11C]methylpurine ([11C]9m6BP). To increase the RCY of [11C]7m6BP, we investigated conditions for improving the [11C]7m6BP/[11C]9m6BP selectivity of the methylation reaction. RESULTS [11C]7m6BP was manually synthesized via the methylation of 6-bromopurine with [11C]CH3I in various solvents and at different temperatures in the presence of potassium carbonate for 5 min. Several less polar solvents, including tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-MeTHF), and ethyl acetate (AcOEt) improved the [11C]7m6BP/[11C]9m6BP selectivity from 1:1 to 2:1, compared with the conventionally used solvents for the alkylation of 6-halopurines, acetone, acetonitrile, and N,N-dimethylformamide. However, a higher temperature (140 °C or 180 °C) was needed to progress the 11C-methylation in the less polar solvents, and the manual conditions could not be directly translated to an automated synthesis. [11C]Methyl triflate ([11C]CH3OTf) was thus used as a methylating agent to increase the conversion at a lower temperature. The 11C-methylation using [11C]CH3OTf at 100 °C proceeded efficiently in THF, 2-MeTHF, and AcOEt with maintenance of the improved selectivity. Starting from 28 to 34 GBq [11C]CO2, [11C]7m6BP was produced with 2.3-2.6 GBq for THF, 2.7-3.3 GBq for AcOEt, and 2.8-3.9 GBq for 2-MeTHF at approximately 30 min after the end of bombardment (n = 3 per solvent). The isolated RCYs (decay corrected) for THF, 2-MeTHF, and AcOEt were 24-28%, 29-35%, and 22-31% (n = 3), respectively. CONCLUSIONS The use of THF, 2-MeTHF, and AcOEt improved the [11C]7m6BP/[11C]9m6BP selectivity in the methylation reaction, and the improved method provided [11C]7m6BP with sufficient radioactivity for clinical use.
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Affiliation(s)
- Toshimitsu Okamura
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
| | - Tatsuya Kikuchi
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Masanao Ogawa
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
- SHI Accelerator Service, Ltd., 7-1-1 Nishigotanda, Shinagawa-ku, Tokyo, 141-0031, Japan
| | - Ming-Rong Zhang
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
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Ronaldson PT, Davis TP. Blood-brain barrier transporters: a translational consideration for CNS delivery of neurotherapeutics. Expert Opin Drug Deliv 2024; 21:71-89. [PMID: 38217410 PMCID: PMC10842757 DOI: 10.1080/17425247.2024.2306138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 01/12/2024] [Indexed: 01/15/2024]
Abstract
INTRODUCTION Successful neuropharmacology requires optimization of CNS drug delivery and, by extension, free drug concentrations at brain molecular targets. Detailed assessment of blood-brain barrier (BBB) physiological characteristics is necessary to achieve this goal. The 'next frontier' in CNS drug delivery is targeting BBB uptake transporters, an approach that requires evaluation of brain endothelial cell transport processes so that effective drug accumulation and improved therapeutic efficacy can occur. AREAS COVERED BBB permeability of drugs is governed by tight junction protein complexes (i.e., physical barrier) and transporters/enzymes (i.e., biochemical barrier). For most therapeutics, a component of blood-to-brain transport involves passive transcellular diffusion. Small molecule drugs that do not possess acceptable physicochemical characteristics for passive permeability may utilize putative membrane transporters for CNS uptake. While both uptake and efflux transport mechanisms are expressed at the brain microvascular endothelium, uptake transporters can be targeted for optimization of brain drug delivery and improved treatment of neurological disease states. EXPERT OPINION Uptake transporters represent a unique opportunity to optimize brain drug delivery by leveraging the endogenous biology of the BBB. A rigorous understanding of these transporters is required to improve translation from the bench to clinical trials and stimulate the development of new treatment paradigms for neurological diseases.
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Affiliation(s)
| | - Thomas P. Davis
- Department of Pharmacology, University of Arizona College of Medicine
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Mairinger S, Hernández-Lozano I, Zachhuber L, Filip T, Löbsch M, Zeitlinger M, Hacker M, Ehrhardt C, Langer O. Effect of budesonide on pulmonary activity of multidrug resistance-associated protein 1 assessed with PET imaging in rats. Eur J Pharm Sci 2023; 184:106414. [PMID: 36858275 DOI: 10.1016/j.ejps.2023.106414] [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: 12/07/2022] [Revised: 02/10/2023] [Accepted: 02/25/2023] [Indexed: 03/02/2023]
Abstract
Multidrug resistance-associated protein 1 (MRP1/ABCC1) is a highly abundant efflux transporter in the lungs, which protects cells from toxins and oxidative stress and has been implicated in the pathophysiology of chronic obstructive pulmonary disease and cystic fibrosis. There is evidence from in vitro studies that the inhaled glucocorticoid budesonide can inhibit MRP1 activity. We used positron emission tomography (PET) imaging with 6-bromo-7-[11C]methylpurine ([11C]BMP), which is transformed in vivo into a radiolabeled MRP1 substrate, to assess whether intratracheally (i.t.) aerosolized budesonide affects pulmonary MRP1 activity in rats. Three groups of rats (n = 5-6 each) underwent dynamic PET scans of the lungs after i.t. aerosolization of either [11C]BMP alone, or [11C]BMP mixed with either budesonide (0.04 mg, corresponding to the maximum soluble dose) or the model MRP1 inhibitor MK571 (2 mg). From PET-measured radioactivity concentration-time curves, the rate constant describing radioactivity elimination from the right lung (kE,lung) and the area under the curve (AUClung) were calculated from 0 to 5 min after start of the PET scan as measures of pulmonary MRP1 activity. Co-administration of MK571 resulted in a pronounced decrease in kE,lung (25-fold, p < 0.0001) and an increase in AUClung (5.3-fold, p < 0.0001) when compared with vehicle-treated animals. In contrast, in budesonide-treated animals kE,lung and AUClung were not significantly different from the vehicle group. Our results show that i.t. aerosolized budesonide at an approximately 5 times higher dose than the maximum clinical dose leads to no change in pulmonary MRP1 activity, suggesting a lack of an effect of inhaled budesonide treatment on the MRP1-mediated cellular detoxifying capacity of the lungs. However, the strong effect observed for MK571 raises the possibility for the occurrence of transporter-mediated drug-drug interactions at the pulmonary epithelium with inhaled medicines.
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Affiliation(s)
- Severin Mairinger
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria; Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna Austria.
| | - Irene Hernández-Lozano
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria.
| | - Lena Zachhuber
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna Austria.
| | - Thomas Filip
- Core Facility Laboratory Animal Breeding and Husbandry, Medical University of Vienna, 1090 Vienna, Austria; Center for Biomedical Research, Medical University of Vienna, 1090 Vienna, Austria.
| | - Mathilde Löbsch
- Core Facility Laboratory Animal Breeding and Husbandry, Medical University of Vienna, 1090 Vienna, Austria.
| | - Markus Zeitlinger
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria.
| | - Marcus Hacker
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna Austria.
| | - Carsten Ehrhardt
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.
| | - Oliver Langer
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria; Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna Austria.
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Pérez-Sala D, Pajares MA. Appraising the Role of Astrocytes as Suppliers of Neuronal Glutathione Precursors. Int J Mol Sci 2023; 24:ijms24098059. [PMID: 37175763 PMCID: PMC10179008 DOI: 10.3390/ijms24098059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 04/25/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
The metabolism and intercellular transfer of glutathione or its precursors may play an important role in cellular defense against oxidative stress, a common hallmark of neurodegeneration. In the 1990s, several studies in the Neurobiology field led to the widely accepted notion that astrocytes produce large amounts of glutathione that serve to feed neurons with precursors for glutathione synthesis. This assumption has important implications for health and disease since a reduction in this supply from astrocytes could compromise the capacity of neurons to cope with oxidative stress. However, at first glance, this shuttling would imply a large energy expenditure to get to the same point in a nearby cell. Thus, are there additional underlying reasons for this expensive mechanism? Are neurons unable to import and/or synthesize the three non-essential amino acids that are the glutathione building blocks? The rather oxidizing extracellular environment favors the presence of cysteine (Cys) as cystine (Cis), less favorable for neuronal import. Therefore, it has also been proposed that astrocytic GSH efflux could induce a change in the redox status of the extracellular space nearby the neurons, locally lowering the Cis/Cys ratio. This astrocytic glutathione release would also increase their demand for precursors, stimulating Cis uptake, which these cells can import, further impacting the local decline of the Cis/Cys ratio, in turn, contributing to a more reduced extracellular environment and subsequently favoring neuronal Cys import. Here, we revisit the experimental evidence that led to the accepted hypothesis of astrocytes acting as suppliers of neuronal glutathione precursors, considering recent data from the Human Protein Atlas. In addition, we highlight some potential drawbacks of this hypothesis, mainly supported by heterogeneous cellular models. Finally, we outline additional and more cost-efficient possibilities by which astrocytes could support neuronal glutathione levels, including its shuttling in extracellular vesicles.
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Affiliation(s)
- Dolores Pérez-Sala
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - María A Pajares
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), Ramiro de Maeztu 9, 28040 Madrid, Spain
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Sake JA, Selo MA, Burtnyak L, Dähnhardt HE, Helbet C, Mairinger S, Langer O, Kelly VP, Ehrhardt C. Knockout of ABCC1 in NCI-H441 cells reveals CF to be a suboptimal substrate to study MRP1 activity in organotypic in vitro models. Eur J Pharm Sci 2023; 181:106364. [PMID: 36563915 DOI: 10.1016/j.ejps.2022.106364] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 12/04/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
Multidrug resistance-associated protein 1 (MRP1/ABCC1) is an efflux transporter responsible for the extrusion of endogenous substances as well as xenobiotics and their respective metabolites. Its high expression levels in lung tissue imply a key role in pulmonary drug disposition. Moreover, its association with inflammatory lung diseases underline MRP1's relevance in drug development and precision-medicine. With the aim to develop a tool to better understand MRP1's role in drug disposition and lung disease, we generated an ABCC1-/- clone based on the human distal lung epithelial cell line NCI-H441 via a targeted CRISPR/Cas9 approach. Successful knockout (KO) of MRP1 was confirmed by qPCR, immunoblot and Sanger sequencing. To assess potential compensatory upregulation of transporters with a similar substrate recognition pattern as MRP1, expression levels of MRP2-9 as well as OAT1-4, 6, 7 and 10 were measured. Functional transporter activity was determined via release studies with two prodrug/substrate pairs, i.e. 5(6)-carboxyfluorescein (CF; formed from its diacetate prodrug) and S-(6-(7-methylpurinyl))glutathione (MPG; formed from its prodrug 6-bromo-7-methylpurine, BMP), respectively. Lastly, transepithelial electrical resistance (TEER) of monolayers of the KO clone were compared with wildtype (WT) NCI-H441 cells. Of eight initially generated clones, the M2 titled clone showed complete absence of mRNA and protein in accordance with the designed genome edit. In transport studies using the substrate CF, however, no differences between the KO clone and WT NCI-H441 cells were observed, whilst no differences in expression of potential compensatory transporters was noted. On the other hand, when using BMP/MPG, the release of MPG was reduced to 11.5% in the KO clone. Based on these results, CF appears to be a suboptimal probe for the study of MRP1 function, particularly in organotypic in vitro and ex vivo models. Our ABCC1-/- NCI-H441 clone further retained the ability to form electrically tight barriers, making it a useful model to study MRP1 function in vitro.
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Affiliation(s)
- Johannes A Sake
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
| | - Mohammed Ali Selo
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland; Faculty of Pharmacy, University of Kufa, Al-Najaf, Iraq
| | - Lyubomyr Burtnyak
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Henriette E Dähnhardt
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
| | - Camelia Helbet
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
| | - Severin Mairinger
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria; Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Oliver Langer
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria; Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Vincent P Kelly
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Carsten Ehrhardt
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland.
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Liu HJ, Xu P. Strategies to overcome/penetrate the BBB for systemic nanoparticle delivery to the brain/brain tumor. Adv Drug Deliv Rev 2022; 191:114619. [PMID: 36372301 PMCID: PMC9724744 DOI: 10.1016/j.addr.2022.114619] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/23/2022] [Accepted: 11/06/2022] [Indexed: 11/13/2022]
Abstract
Despite its prevalence in the management of peripheral tumors, compared to surgery and radiation therapy, chemotherapy is still a suboptimal intervention in fighting against brain cancer and cancer brain metastases. This discrepancy is mainly derived from the complicatedly physiological characteristic of intracranial tumors, including the presence of blood-brain barrier (BBB) and limited enhanced permeability and retention (EPR) effect attributed to blood-brain tumor barrier (BBTB), which largely lead to insufficient therapeutics penetrating to tumor lesions to produce pharmacological effects. Therefore, dependable methodologies that can boost the efficacy of chemotherapy for brain tumors are urgently needed. Recently, nanomedicines have shown great therapeutic potential in brain tumors by employing various transcellular strategies, paracellular strategies, and their hybrids, such as adsorptive-mediated transcytosis, receptor-mediated transcytosis, BBB disruption technology, and so on. It is compulsory to comprehensively summarize these practices to shed light on future directions in developing therapeutic regimens for brain tumors. In this review, the biological and pathological characteristics of brain tumors, including BBB and BBTB, are illustrated. After that, the emerging delivery strategies for brain tumor management are summarized into different classifications and supported with detailed examples. Finally, the potential challenges and prospects for developing and clinical application of brain tumor-oriented nanomedicine are discussed.
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Affiliation(s)
- Hai-Jun Liu
- Department of Discovery and Biomedical Sciences, College of Pharmacy, University of South Carolina, 715 Sumter, Columbia, SC 29208, USA
| | - Peisheng Xu
- Department of Discovery and Biomedical Sciences, College of Pharmacy, University of South Carolina, 715 Sumter, Columbia, SC 29208, USA.
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Wölfl-Duchek M, Mairinger S, Hernández-Lozano I, Filip T, Zoufal V, Löbsch M, Stanek J, Kuntner C, Wanek T, Bauer M, Pahnke J, Langer O. Use of PET Imaging to Assess the Efficacy of Thiethylperazine to Stimulate Cerebral MRP1 Transport Activity in Wild-Type and APP/PS1-21 Mice. Int J Mol Sci 2022; 23:6514. [PMID: 35742960 PMCID: PMC9224167 DOI: 10.3390/ijms23126514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/08/2022] [Accepted: 06/09/2022] [Indexed: 11/16/2022] Open
Abstract
Multidrug resistance-associated protein 1 (MRP1, encoded by the ABCC1 gene) may contribute to the clearance of amyloid-beta (Aβ) peptides from the brain into the blood and stimulation of MRP1 transport activity may be a therapeutic approach to enhance brain Aβ clearance. In this study, we assessed the effect of thiethylperazine, an antiemetic drug which was shown to stimulate MRP1 activity in vitro and to decrease Aβ load in a rapid β-amyloidosis mouse model (APP/PS1-21), on MRP1 transport activity by means of positron emission tomography (PET) imaging with the MRP1 tracer 6-bromo-7-[11C]methylpurine. Groups of wild-type, APP/PS1-21 and Abcc1(-/-) mice underwent PET scans before and after a 5-day oral treatment period with thiethylperazine (15 mg/kg, once daily). The elimination rate constant of radioactivity (kelim) was calculated from time-activity curves in the brain and the lungs as a measure of tissue MRP1 activity. Treatment with thiethylperazine had no significant effect on MRP1 activity in the brain and the lungs of wild-type and APP/PS1-21 mice. This may either be related to a lack of an MRP1-stimulating effect of thiethylperazine in vivo or to other factors, such as substrate-dependent MRP1 stimulation, insufficient target tissue exposure to thiethylperazine or limited sensitivity of the PET tracer to measure MRP1 stimulation.
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Affiliation(s)
- Michael Wölfl-Duchek
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria; (M.W.-D.); (S.M.); (I.H.-L.); (M.B.)
| | - Severin Mairinger
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria; (M.W.-D.); (S.M.); (I.H.-L.); (M.B.)
- Department of Biomedical Imaging und Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria; (J.S.); (C.K.); (T.W.)
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
| | - Irene Hernández-Lozano
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria; (M.W.-D.); (S.M.); (I.H.-L.); (M.B.)
| | - Thomas Filip
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
- Core Facility Laboratory Animal Breeding and Husbandry, Medical University of Vienna, 1090 Vienna, Austria
| | - Viktoria Zoufal
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
| | - Mathilde Löbsch
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
- Core Facility Laboratory Animal Breeding and Husbandry, Medical University of Vienna, 1090 Vienna, Austria
| | - Johann Stanek
- Department of Biomedical Imaging und Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria; (J.S.); (C.K.); (T.W.)
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
| | - Claudia Kuntner
- Department of Biomedical Imaging und Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria; (J.S.); (C.K.); (T.W.)
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
| | - Thomas Wanek
- Department of Biomedical Imaging und Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria; (J.S.); (C.K.); (T.W.)
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
| | - Martin Bauer
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria; (M.W.-D.); (S.M.); (I.H.-L.); (M.B.)
| | - Jens Pahnke
- Department of Neuro-/Pathology, Oslo University Hospital (OUS), University of Oslo (UiO), 0424 Oslo, Norway;
- LIED, University of Lübeck, 23562 Lübeck, Germany
- Department of Pharmacology, Faculty of Medicine, University of Latvia, 1586 Rīga, Latvia
- Department of Neurobiology, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Oliver Langer
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria; (M.W.-D.); (S.M.); (I.H.-L.); (M.B.)
- Department of Biomedical Imaging und Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria; (J.S.); (C.K.); (T.W.)
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, 2444 Seibersdorf, Austria; (T.F.); (V.Z.); (M.L.)
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Blood-Brain Barrier Transporters: Opportunities for Therapeutic Development in Ischemic Stroke. Int J Mol Sci 2022; 23:ijms23031898. [PMID: 35163820 PMCID: PMC8836701 DOI: 10.3390/ijms23031898] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 12/20/2022] Open
Abstract
Globally, stroke is a leading cause of death and long-term disability. Over the past decades, several efforts have attempted to discover new drugs or repurpose existing therapeutics to promote post-stroke neurological recovery. Preclinical stroke studies have reported successes in identifying novel neuroprotective agents; however, none of these compounds have advanced beyond a phase III clinical trial. One reason for these failures is the lack of consideration of blood-brain barrier (BBB) transport mechanisms that can enable these drugs to achieve efficacious concentrations in ischemic brain tissue. Despite the knowledge that drugs with neuroprotective properties (i.e., statins, memantine, metformin) are substrates for endogenous BBB transporters, preclinical stroke research has not extensively studied the role of transporters in central nervous system (CNS) drug delivery. Here, we review current knowledge on specific BBB uptake transporters (i.e., organic anion transporting polypeptides (OATPs in humans; Oatps in rodents); organic cation transporters (OCTs in humans; Octs in rodents) that can be targeted for improved neuroprotective drug delivery. Additionally, we provide state-of-the-art perspectives on how transporter pharmacology can be integrated into preclinical stroke research. Specifically, we discuss the utility of in vivo stroke models to transporter studies and considerations (i.e., species selection, co-morbid conditions) that will optimize the translational success of stroke pharmacotherapeutic experiments.
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Zoufal V, Mairinger S, Krohn M, Wanek T, Filip T, Sauberer M, Stanek J, Kuntner C, Pahnke J, Langer O. Measurement of cerebral ABCC1 transport activity in wild-type and APP/PS1-21 mice with positron emission tomography. J Cereb Blood Flow Metab 2020; 40:954-965. [PMID: 31195936 PMCID: PMC7181082 DOI: 10.1177/0271678x19854541] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 04/17/2019] [Accepted: 05/05/2019] [Indexed: 12/11/2022]
Abstract
Previous data suggest a possible link between multidrug resistance-associated protein 1 (ABCC1) and brain clearance of beta-amyloid (Aβ). We used PET with 6-bromo-7-[11C]methylpurine ([11C]BMP) to measure cerebral ABCC1 transport activity in a beta-amyloidosis mouse model (APP/PS1-21) and in wild-type mice aged 50 and 170 days, without and with pretreatment with the ABCC1 inhibitor MK571. One hundred seventy days-old-animals additionally underwent [11C]PiB PET scans to measure Aβ load. While baseline [11C]BMP PET scans detected no differences in the elimination slope of radioactivity washout from the brain (kelim) between APP/PS1-21 and wild-type mice of both age groups, PET scans after MK571 pretreatment revealed significantly higher kelim values in APP/PS1-21 mice than in wild-type mice aged 170 days, suggesting increased ABCC1 activity. The observed increase in kelim occurred across all investigated brain regions and was independent of the presence of Aβ plaques measured with [11C]PiB. Western blot analysis revealed a trend towards increased whole brain ABCC1 levels in 170 days-old-APP/PS1-21 mice versus wild-type mice and a significant positive correlation between ABCC1 levels and kelim. Our data point to an upregulation of ABCC1 in APP/PS1-21 mice, which may be related to an induction of ABCC1 in astrocytes as a protective mechanism against oxidative stress.
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Affiliation(s)
- Viktoria Zoufal
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Severin Mairinger
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Markus Krohn
- Department of Neuro/Pathology,
University of Oslo (UiO) and Oslo University Hospital (OUS), Oslo, Norway
- University of Lübeck Institute for
Experimental und Clinical Pharmacology and Toxicology Center of Brain, Behavior and
Metabolism (CBBM), Lübeck, Germany
| | - Thomas Wanek
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Thomas Filip
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Michael Sauberer
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Johann Stanek
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Claudia Kuntner
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Jens Pahnke
- Department of Neuro/Pathology,
University of Oslo (UiO) and Oslo University Hospital (OUS), Oslo, Norway
- LIED, University of Lübeck,
Germany
- Leibniz-Institute of Plant Biochemistry,
Halle, Germany
- Medical Faculty, Department of
Pharmacology, University of Latvia, Rīga, Latvia
| | - Oliver Langer
- Preclinical Molecular Imaging, AIT
Austrian Institute of Technology GmbH, Seibersdorf, Austria
- Department of Clinical Pharmacology,
Medical University of Vienna, Vienna, Austria
- Department of Biomedical Imaging und
Image-guided Therapy, Division of Nuclear Medicine, Medical University of Vienna,
Vienna, Austria
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Mairinger S, Sake JA, Lozano IH, Filip T, Sauberer M, Stanek J, Wanek T, Ehrhardt C, Langer O. Assessing the Activity of Multidrug Resistance–Associated Protein 1 at the Lung Epithelial Barrier. J Nucl Med 2020; 61:1650-1657. [DOI: 10.2967/jnumed.120.244038] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 03/19/2020] [Indexed: 01/26/2023] Open
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Krohn M, Zoufal V, Mairinger S, Wanek T, Paarmann K, Brüning T, Eiriz I, Brackhan M, Langer O, Pahnke J. Generation and Characterization of an Abcc1 Humanized Mouse Model ( hABCC1flx/flx ) with Knockout Capability. Mol Pharmacol 2019; 96:138-147. [PMID: 31189668 DOI: 10.1124/mol.119.115824] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 06/03/2019] [Indexed: 01/18/2023] Open
Abstract
ATP-binding cassette (ABC) transporters such as ABCB1 (P-glycoprotein), ABCC1 (MRP1), and ABCG2 (BCRP) are well known for their role in rendering cancer cells resistant to chemotherapy. Additionally, recent research provided evidence that, along with other ABC transporters (ABCA1 and ABCA7), they might be cornerstones to tackle neurodegenerative diseases. Overcoming chemoresistance in cancer, understanding drug-drug interactions, and developing efficient and specific drugs that alter ABC transporter function are hindered by a lack of in vivo research models, which are fully predictive for humans. Hence, the humanization of ABC transporters in mice has become a major focus in pharmaceutical and neurodegenerative research. Here, we present a characterization of the first Abcc1 humanized mouse line. To preserve endogenous expression profiles, we chose to generate a knockin mouse model that leads to the expression of a chimeric protein that is fully human except for one amino acid. We found robust mRNA and protein expression within all major organs analyzed (brain, lung, spleen, and kidney). Furthermore, we demonstrate the functionality of the expressed human ABCC1 protein in brain and lungs using functional positron emission tomography imaging in vivo. Through the introduction of loxP sites, we additionally enabled this humanized mouse model for highly sophisticated studies involving cell type-specific transporter ablation. Based on our data, the presented mouse model appears to be a promising tool for the investigation of cell-specific ABCC1 function. It can provide a new basis for better translation of preclinical research.
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Affiliation(s)
- Markus Krohn
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Viktoria Zoufal
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Severin Mairinger
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Thomas Wanek
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Kristin Paarmann
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Thomas Brüning
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Ivan Eiriz
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Mirjam Brackhan
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Oliver Langer
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
| | - Jens Pahnke
- Department of Neuro-/Pathology and Oslo University Hospital, University of Oslo, Oslo, Norway (M.K., K.P., T.B., I.E., M.B., J.P.); Biomedical Systems, Center for Health & Bioresources, Austrian Institute of Technology, Seibersdorf, Austria (V.Z., S.M., T.W., O.L.); Department of Clinical Pharmacology and Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria (O.L.); Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany (J.P.); Leibniz-Institute of Plant Biochemistry, Halle, Germany (J.P.); and Department of Pharmacology, Medical Faculty, University of Latvia, Rīga, Latvia (J.P.)
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