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Bajwa AA, Neubauer A, Schwerter M, Schilling L. 23Na chemical shift imaging in the living rat brain using a chemical shift agent, Tm[DOTP] 5. MAGMA (NEW YORK, N.Y.) 2023; 36:107-118. [PMID: 36053432 PMCID: PMC9992022 DOI: 10.1007/s10334-022-01040-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 08/19/2022] [Accepted: 08/22/2022] [Indexed: 10/14/2022]
Abstract
OBJECTIVE It is well known that the use of shift reagents (SRs) in nuclear magnetic resonance (NMR) studies is substantially limited by an intact blood-brain barrier (BBB). The current study aims to develop a method enabling chemical shift imaging in the living rat brain under physiological conditions using an SR, Tm[DOTP]5-. MATERIALS AND METHODS Hyperosmotic mannitol bolus injection followed by 60 min infusion of a Tm[DOTP]5- containing solution was administered via a catheter inserted into an internal carotid artery. We monitored the homeostasis of physiological parameters, and we measured the thulium content in brain tissue post mortem using total reflection fluorescence spectroscopy (T-XRF). The alterations of the 23Na resonance spectrum were followed in a 9.4T small animal scanner. RESULTS Based on the T-XRF measurements, the thulium concentration was estimated at 2.3 ± 1.8 mM in the brain interstitial space. Spectroscopic imaging showed a split of the 23Na resonance peak which became visible 20 min after starting the infusion. Chemical shift imaging revealed a significant decrease of the initial intensity level to 0.915 ± 0.058 at the end of infusion. CONCLUSION Our novel protocol showed bulk accumulation of Tm[DOTP]5- thus enabling separation of the extra-/intracellular 23Na signal components in the living rat brain while maintaining physiological homeostasis.
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Affiliation(s)
- Awais A Bajwa
- Division of Neurosurgical Research, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Andreas Neubauer
- Department of Computer Assisted Clinical Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Michael Schwerter
- Department of Computer Assisted Clinical Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.,Institute of Neuroscience and Medicine (INM-4), Medical Imaging Physics, Forschungszentrum Jülich, Jülich, Germany
| | - Lothar Schilling
- Division of Neurosurgical Research, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. .,European Center of Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
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Khan MH, Mishra SK, Zakaria ABM, Mihailović JM, Coman D, Hyder F. Comparison of Lanthanide Macrocyclic Complexes as 23Na NMR Sensors. Anal Chem 2022; 94:2536-2545. [DOI: 10.1021/acs.analchem.1c04432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Muhammad H. Khan
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Sandeep Kumar Mishra
- Department of Radiology & Biomedical Imaging, Yale University, New Haven, Connecticut 06520, United States
| | - A. B. M. Zakaria
- Department of Radiology & Biomedical Imaging, Yale University, New Haven, Connecticut 06520, United States
| | - Jelena M. Mihailović
- Department of Radiology & Biomedical Imaging, Yale University, New Haven, Connecticut 06520, United States
| | - Daniel Coman
- Department of Radiology & Biomedical Imaging, Yale University, New Haven, Connecticut 06520, United States
| | - Fahmeed Hyder
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut 06520, United States
- Department of Radiology & Biomedical Imaging, Yale University, New Haven, Connecticut 06520, United States
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Khan MH, Walsh JJ, Mihailović JM, Mishra SK, Coman D, Hyder F. Imaging the transmembrane and transendothelial sodium gradients in gliomas. Sci Rep 2021; 11:6710. [PMID: 33758290 PMCID: PMC7987982 DOI: 10.1038/s41598-021-85925-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 03/08/2021] [Indexed: 11/29/2022] Open
Abstract
Under normal conditions, high sodium (Na+) in extracellular (Na+e) and blood (Na+b) compartments and low Na+ in intracellular milieu (Na+i) produce strong transmembrane (ΔNa+mem) and weak transendothelial (ΔNa+end) gradients respectively, and these manifest the cell membrane potential (Vm) as well as blood–brain barrier (BBB) integrity. We developed a sodium (23Na) magnetic resonance spectroscopic imaging (MRSI) method using an intravenously-administered paramagnetic polyanionic agent to measure ΔNa+mem and ΔNa+end. In vitro 23Na-MRSI established that the 23Na signal is intensely shifted by the agent compared to other biological factors (e.g., pH and temperature). In vivo 23Na-MRSI showed Na+i remained unshifted and Na+b was more shifted than Na+e, and these together revealed weakened ΔNa+mem and enhanced ΔNa+end in rat gliomas (vs. normal tissue). Compared to normal tissue, RG2 and U87 tumors maintained weakened ΔNa+mem (i.e., depolarized Vm) implying an aggressive state for proliferation, whereas RG2 tumors displayed elevated ∆Na+end suggesting altered BBB integrity. We anticipate that 23Na-MRSI will allow biomedical explorations of perturbed Na+ homeostasis in vivo.
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Affiliation(s)
- Muhammad H Khan
- Department of Biomedical Engineering, Yale University, N143 TAC (MRRC), 300 Cedar Street, New Haven, CT, 06520, USA.
| | - John J Walsh
- Department of Biomedical Engineering, Yale University, N143 TAC (MRRC), 300 Cedar Street, New Haven, CT, 06520, USA
| | - Jelena M Mihailović
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, 06520, USA
| | - Sandeep K Mishra
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, 06520, USA
| | - Daniel Coman
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, 06520, USA
| | - Fahmeed Hyder
- Department of Biomedical Engineering, Yale University, N143 TAC (MRRC), 300 Cedar Street, New Haven, CT, 06520, USA. .,Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, 06520, USA.
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Application of Heteronuclear NMR Spectroscopy to Bioinorganic and Medicinal Chemistry ☆. REFERENCE MODULE IN CHEMISTRY, MOLECULAR SCIENCES AND CHEMICAL ENGINEERING 2018. [PMCID: PMC7157447 DOI: 10.1016/b978-0-12-409547-2.10947-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Shishmarev D, Kuchel PW. NMR magnetization-transfer analysis of rapid membrane transport in human erythrocytes. Biophys Rev 2016; 8:369-384. [PMID: 28510013 PMCID: PMC5425803 DOI: 10.1007/s12551-016-0221-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 09/13/2016] [Indexed: 10/20/2022] Open
Abstract
Nuclear magnetic resonance (NMR) magnetization-transfer (MT) experiments provide a convenient tool for studying rapid sub-second membrane-transport processes in situ in metabolically active cells. These experiments are used with membrane-permeable substances when separate (resolved) NMR signals are observed from their populations inside and outside the cells. Here, we provide a description of the theory and practice of the most common NMR MT experiments that have been used to study membrane-transport processes in human erythrocytes (red blood cells; RBCs). The procedures, involved in the analysis of the experimental data for defining mechanisms of transport, and for estimating values of kinetic parameters in the corresponding mathematical models, are given special attention.
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Affiliation(s)
- Dmitry Shishmarev
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Philip W Kuchel
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, 2006, Australia.
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Grigorova YN, Juhasz O, Zernetkina V, Fishbein KW, Lakatta EG, Fedorova OV, Bagrov AY. Aortic Fibrosis, Induced by High Salt Intake in the Absence of Hypertensive Response, is Reduced by a Monoclonal Antibody to Marinobufagenin. Am J Hypertens 2016; 29:641-6. [PMID: 26350300 DOI: 10.1093/ajh/hpv155] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 08/13/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Marinobufagenin (MBG) is an endogenous Na/K-ATPase inhibitor, a natriuretic and a vasoconstrictor. MBG is implicated in salt-sensitive hypertension, cardiac hypertrophy, and initiate the pro-fibrotic signaling. Previously it was demonstrated that immunoneutralization of an endogenous MBG by 3E9 anti-MBG-antibody (mAb) in vivo lowered blood pressure (BP) and reversed cardiac fibrosis in salt-sensitive, and in partially nephrectomized rats. In the present study, we investigated whether mAb alleviates vascular remodeling induced in normotensive rats on high salt intake. METHODS Wistar rats (5 months old) received normal (CTRL; n = 8) or high salt intake (2% NaCl in drinking water) for 4 weeks ( n = 16). Rats from the group on a high salt intake were administered vehicle (SALT; n = 8) or mAb (50 µg/kg) (SALT-AB; n = 8) during the last week of high salt diet. BP, erythrocyte Na/K-ATPase activity, levels of MBG in plasma and 24-hour urine, and sensitivity of aortic explants to the vasorelaxant effect of sodium nitroprusside (SNP) were measured. Aortic collagen abundance was determined immunohistochemically. RESULTS In SALT vs. CTRL, heightened levels of MBG were associated with inhibition of erythrocyte Na/K-ATPase in the absence of BP changes. High salt intake was accompanied by a 2.5-fold increase in aortic collagen abundance and by a reduction of sensitivity of aortic explants to the vasorelaxant effect of SNP following endothelin-1-induced constriction. In the SALT-AB group, all NaCl-mediated effects were reversed by immunoneutralization of MBG. CONCLUSIONS High salt intake in young normotensive rats can induce vascular fibrosis via pressure-independent/MBG-dependent mechanisms, and this remodeling is reduced by immunoneutralization of MBG.
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Affiliation(s)
- Yulia N Grigorova
- National Institute on Aging, NIH, Baltimore, Maryland, USA; Federal Almazov Medical Research Centre, and Sechenov Institute of Evolutionary Physiology and Biochemistry, St Petersburg, Russia
| | - Ondrej Juhasz
- National Institute on Aging, NIH, Baltimore, Maryland, USA
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Castro G, Regueiro-Figueroa M, Esteban-Gómez D, Pérez-Lourido P, Platas-Iglesias C, Valencia L. Magnetic Anisotropies in Rhombic Lanthanide(III) Complexes Do Not Conform to Bleaney’s Theory. Inorg Chem 2016; 55:3490-7. [DOI: 10.1021/acs.inorgchem.5b02918] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Goretti Castro
- Departamento de Química Inorgánica,
Facultad de Ciencias, Universidade de Vigo, As Lagoas, Pontevedra, Marcosende 36310, Spain
| | - Martín Regueiro-Figueroa
- Centro
de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - David Esteban-Gómez
- Centro
de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Paulo Pérez-Lourido
- Departamento de Química Inorgánica,
Facultad de Ciencias, Universidade de Vigo, As Lagoas, Pontevedra, Marcosende 36310, Spain
| | - Carlos Platas-Iglesias
- Centro
de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Laura Valencia
- Departamento de Química Inorgánica,
Facultad de Ciencias, Universidade de Vigo, As Lagoas, Pontevedra, Marcosende 36310, Spain
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Pagès G, Puckeridge M, Liangfeng G, Tan Y, Jacob C, Garland M, Kuchel P. Transmembrane exchange of hyperpolarized 13C-urea in human erythrocytes: subminute timescale kinetic analysis. Biophys J 2013; 105:1956-66. [PMID: 24209840 PMCID: PMC3824547 DOI: 10.1016/j.bpj.2013.09.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 08/28/2013] [Accepted: 09/24/2013] [Indexed: 11/15/2022] Open
Abstract
The rate of exchange of urea across the membranes of human erythrocytes (red blood cells) was quantified on the 1-s to 2-min timescale. (13)C-urea was hyperpolarized and subjected to rapid dissolution and the previously reported (partial) resolution of (13)C NMR resonances from the molecules inside and outside red blood cells in suspensions was observed. This enabled a stopped-flow type of experiment to measure the (initially) zero-trans transport of urea with sequential single-pulse (13)C NMR spectra, every second for up to ~2 min. Data were analyzed using Bayesian reasoning and a Markov chain Monte Carlo method with a set of simultaneous nonlinear differential equations that described nuclear magnetic relaxation combined with transmembrane exchange. Our results contribute to quantitative understanding of urea-exchange kinetics in the whole body; and the methodological approach is likely to be applicable to other cellular systems and tissues in vivo.
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Affiliation(s)
| | - Max Puckeridge
- School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia
| | - Guo Liangfeng
- Institute of Chemical and Engineering Sciences, ASTAR, Singapore
| | - Yee Ling Tan
- Singapore Bioimaging Consortium, ASTAR, Singapore
| | - Chacko Jacob
- Institute of Chemical and Engineering Sciences, ASTAR, Singapore
| | - Marc Garland
- Institute of Chemical and Engineering Sciences, ASTAR, Singapore
| | - Philip W. Kuchel
- Singapore Bioimaging Consortium, ASTAR, Singapore
- School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia
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Puckeridge M, Chapman BE, Conigrave AD, Grieve SM, Figtree GA, Kuchel PW. Stoichiometric relationship between Na(+) ions transported and glucose consumed in human erythrocytes: Bayesian analysis of (23)Na and (13)C NMR time course data. Biophys J 2013; 104:1676-84. [PMID: 23601315 DOI: 10.1016/j.bpj.2013.03.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Revised: 02/17/2013] [Accepted: 03/07/2013] [Indexed: 11/30/2022] Open
Abstract
We examined the response of Na(+),K(+)-ATPase (NKA) to monensin, a Na(+) ionophore, with and without ouabain, an NKA inhibitor, in suspensions of human erythrocytes (red blood cells). A combination of (13)C and (23)Na NMR methods allowed the recording of intra- and extracellular Na(+), and (13)C-labeled glucose time courses. The net influx of Na(+) and the consumption of glucose were measured with and without NKA inhibited by ouabain. A Bayesian analysis was used to determine probability distributions of the parameter values of a minimalist mathematical model of the kinetics involved, and then used to infer the rates of Na(+) transported and glucose consumed. It was estimated that the numerical relationship between the number of Na(+) ions transported by NKA per molecule of glucose consumed by a red blood cell was close to the ratio 6.0:1.0, agreeing with theoretical prediction.
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Affiliation(s)
- Max Puckeridge
- School of Molecular Bioscience, Kolling Institute, University of Sydney, Sydney, Australia
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Pagès G, Kuchel PW. Mathematical Modeling and Data Analysis of NMR Experiments using Hyperpolarized (13)C Metabolites. MAGNETIC RESONANCE INSIGHTS 2013; 6:13-21. [PMID: 25114541 PMCID: PMC4089703 DOI: 10.4137/mri.s11084] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Rapid-dissolution dynamic nuclear polarization (DNP) has made significant impact in the characterization and understanding of metabolism that occurs on the sub-minute timescale in several diseases. While significant efforts have been made in developing applications, and in designing rapid-imaging radiofrequency (RF) and magnetic field gradient pulse sequences, very few groups have worked on implementing realistic mathematical/kinetic/relaxation models to fit the emergent data. The critical aspects to consider when modeling DNP experiments depend on both nuclear magnetic resonance (NMR) and (bio)chemical kinetics. The former constraints are due to the relaxation of the NMR signal and the application of ‘read’ RF pulses, while the kinetic constraints include the total amount of each molecular species present. We describe the model-design strategy we have used to fit and interpret our DNP results. To our knowledge, this is the first report on a systematic analysis of DNP data.
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Affiliation(s)
- Guilhem Pagès
- Singapore BioImaging Consortium, A STAR, Helios, Singapore
| | - Philip W Kuchel
- School of Molecular Bioscience, The University of Sydney, Sydney, Australia
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