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Adelabu I, TomHon P, Kabir MSH, Nantogma S, Abdulmojeed M, Mandzhieva I, Ettedgui J, Swenson RE, Krishna MC, Theis T, Goodson BM, Chekmenev EY. Order-Unity 13 C Nuclear Polarization of [1- 13 C]Pyruvate in Seconds and the Interplay of Water and SABRE Enhancement. Chemphyschem 2022; 23:e202100839. [PMID: 34813142 PMCID: PMC8770613 DOI: 10.1002/cphc.202100839] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Indexed: 01/21/2023]
Abstract
Signal Amplification By Reversible Exchange in SHield Enabled Alignment Transfer (SABRE-SHEATH) is investigated to achieve rapid hyperpolarization of 13 C1 spins of [1-13 C]pyruvate, using parahydrogen as the source of nuclear spin order. Pyruvate exchange with an iridium polarization transfer complex can be modulated via a sensitive interplay between temperature and co-ligation of DMSO and H2 O. Order-unity 13 C (>50 %) polarization of catalyst-bound [1-13 C]pyruvate is achieved in less than 30 s by restricting the chemical exchange of [1-13 C]pyruvate at lower temperatures. On the catalyst bound pyruvate, 39 % polarization is measured using a 1.4 T NMR spectrometer, and extrapolated to >50 % at the end of build-up in situ. The highest measured polarization of a 30-mM pyruvate sample, including free and bound pyruvate is 13 % when using 20 mM DMSO and 0.5 M water in CD3 OD. Efficient 13 C polarization is also enabled by favorable relaxation dynamics in sub-microtesla magnetic fields, as indicated by fast polarization buildup rates compared to the T1 spin-relaxation rates (e. g., ∼0.2 s-1 versus ∼0.1 s-1 , respectively, for a 6 mM catalyst-[1-13 C]pyruvate sample). Finally, the catalyst-bound hyperpolarized [1-13 C]pyruvate can be released rapidly by cycling the temperature and/or by optimizing the amount of water, paving the way to future biomedical applications of hyperpolarized [1-13 C]pyruvate produced via comparatively fast and simple SABRE-SHEATH-based approaches.
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Affiliation(s)
- Isaiah Adelabu
- Integrative Biosciences, Department of Chemistry Karmanos Cancer Institute, Wayne State University, 5101 Cass Ave, Detroit, MI, 48202, USA
| | - Patrick TomHon
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695-8204, USA
| | - Mohammad S H Kabir
- Integrative Biosciences, Department of Chemistry Karmanos Cancer Institute, Wayne State University, 5101 Cass Ave, Detroit, MI, 48202, USA
| | - Shiraz Nantogma
- Integrative Biosciences, Department of Chemistry Karmanos Cancer Institute, Wayne State University, 5101 Cass Ave, Detroit, MI, 48202, USA
| | - Mustapha Abdulmojeed
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695-8204, USA
| | - Iuliia Mandzhieva
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695-8204, USA
| | - Jessica Ettedgui
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, 9800 Medical Center Drive, Building B, Room #2034, Bethesda, Maryland, 20850, USA
| | - Rolf E Swenson
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, 9800 Medical Center Drive, Building B, Room #2034, Bethesda, Maryland, 20850, USA
| | - Murali C Krishna
- Center for Cancer Research, National Cancer Institute, Bethesda, 31 Center Drive, Maryland, 20814, USA
| | - Thomas Theis
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695-8204, USA
| | - Boyd M Goodson
- School of Chemical and Biomolecular Sciences Materials Technology Center, Southern Illinois University, 1245 Lincoln Dr., Carbondale, IL, 62901, USA
| | - Eduard Y Chekmenev
- Integrative Biosciences, Department of Chemistry Karmanos Cancer Institute, Wayne State University, 5101 Cass Ave, Detroit, MI, 48202, USA
- Russian Academy of Sciences, Leninskiy Prospect, 14, 119991, Moscow, Russia
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Joalland B, Theis T, Appelt S, Chekmenev EY. Background‐Free Proton NMR Spectroscopy with Radiofrequency Amplification by Stimulated Emission Radiation. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Baptiste Joalland
- Department of Chemistry, Integrative Biosciences (Ibio) Wayne State University Karmanos Cancer Institute (KCI) 5101 Cass Ave Detroit MI 48202 USA
| | - Thomas Theis
- Department of Chemistry North Carolina State University Raleigh North Carolina 27695-8204 USA
| | - Stephan Appelt
- Institut für Technische und Makromolekulare Chemie (ITMC) RWTH Aachen University 52056 Aachen Germany
- Central Institute for Engineering Electronics and Analytics—Electronic Systems (ZEA 2) Forschungszentrum Jülich GmbH 52425 Jülich Germany
| | - Eduard Y. Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio) Wayne State University Karmanos Cancer Institute (KCI) 5101 Cass Ave Detroit MI 48202 USA
- Russian Academy of Sciences, Leninskiy Prospect 14, 119991 Moscow Russia
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Joalland B, Theis T, Appelt S, Chekmenev EY. Background-Free Proton NMR Spectroscopy with Radiofrequency Amplification by Stimulated Emission Radiation. Angew Chem Int Ed Engl 2021; 60:26298-26302. [PMID: 34459080 PMCID: PMC8629966 DOI: 10.1002/anie.202108939] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Indexed: 01/13/2023]
Abstract
We report on the utility of Radiofrequency Amplification by Stimulated Emission Radiation (RASER) for background-free proton detection of hyperpolarized biomolecules. We performed hyperpolarization of ≈0.3 M ethyl acetate via pairwise parahydrogen addition to vinyl acetate. A proton NMR signal with signal-to-noise ratio exceeding 100 000 was detected without radio-frequency excitation at the clinically relevant magnetic field of 1.4 T using a standard (non-cryogenic) inductive detector with quality factor of Q=68. No proton background signal was observed from protonated solvent (methanol) or other added co-solvents such as ethanol, water or bovine serum. Moreover, we demonstrate RASER detection without radio-frequency excitation of a bolus of hyperpolarized contrast agent in biological fluid. Completely background-free proton detection of hyperpolarized contrast agents in biological media paves the way to new applications in the areas of high-resolution NMR spectroscopy and in vivo spectroscopy and imaging.
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Affiliation(s)
- Baptiste Joalland
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), 5101 Cass Ave, Detroit, MI, 48202, USA
| | - Thomas Theis
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695-8204, USA
| | - Stephan Appelt
- Institut für Technische und Makromolekulare Chemie (ITMC), RWTH Aachen University, 52056, Aachen, Germany
- Central Institute for Engineering, Electronics and Analytics-Electronic Systems (ZEA 2), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), 5101 Cass Ave, Detroit, MI, 48202, USA
- Russian Academy of Sciences, Leninskiy Prospect, 14, 119991, Moscow, Russia
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MacCulloch K, Tomhon P, Browning A, Akeroyd E, Lehmkuhl S, Chekmenev EY, Theis T. Hyperpolarization of common antifungal agents with SABRE. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:1225-1235. [PMID: 34121211 PMCID: PMC8595556 DOI: 10.1002/mrc.5187] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 06/08/2021] [Accepted: 06/10/2021] [Indexed: 05/09/2023]
Abstract
Signal amplification by reversible exchange (SABRE) is a robust and inexpensive hyperpolarization (HP) technique to enhance nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI) signals using parahydrogen (pH2 ). The substrate scope of SABRE is continually expanding. Here, we present the polarization of three antifungal drugs (voriconazole, clotrimazole, and fluconazole) and elicit the detailed HP mechanisms for 1 H and 15 N nuclei. In this exploratory work, 15 N polarization values of ~1% were achieved using 50% pH2 in solution of 3-mM catalyst and 60-mM substrate in perdeuterated methanol. All hyperpolarized 15 N sites exhibited long T1 in excess of 1 min at a clinically relevant field of 1 T. Hyperpolarizing common drugs is of interest due to their potential biomedical applications as MRI contrast agents or to enable studies on protein dynamics at physiological concentrations. We optimize the polarization with respect to temperature and the polarization transfer field (PTF) for 1 H nuclei in the millitesla regime and for 15 N nuclei in the microtesla regime, which provides detailed insights into exchange kinetics and spin evolution. This work broadens the SABRE substrate scope and provides mechanistic and kinetic insights into the HP process.
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Affiliation(s)
- Keilian MacCulloch
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Patrick Tomhon
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Austin Browning
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Evan Akeroyd
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Sören Lehmkuhl
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI, USA
- Chemistry, Russian Academy of Sciences, Moscow, Moscow Region, Russia
| | - Thomas Theis
- Department of Chemistry, North Carolina State University, Raleigh, NC, USA
- Joint Department of Biomedical Engineering, University of North Carolina, Chapel Hill, NC and North Carolina State University, Raleigh, NC, USA
- Department of Physics, North Carolina State University, Raleigh, NC, USA
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Chukanov NV, Shchepin RV, Joshi SM, Kabir MSH, Salnikov OG, Svyatova A, Koptyug IV, Gelovani JG, Chekmenev EY. Synthetic Approaches for 15 N-Labeled Hyperpolarized Heterocyclic Molecular Imaging Agents for 15 N NMR Signal Amplification by Reversible Exchange in Microtesla Magnetic Fields. Chemistry 2021; 27:9727-9736. [PMID: 33856077 PMCID: PMC8273115 DOI: 10.1002/chem.202100212] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Indexed: 12/23/2022]
Abstract
NMR hyperpolarization techniques enhance nuclear spin polarization by several orders of magnitude resulting in corresponding sensitivity gains. This enormous sensitivity gain enables new applications ranging from studies of small molecules by using high-resolution NMR spectroscopy to real-time metabolic imaging in vivo. Several hyperpolarization techniques exist for hyperpolarization of a large repertoire of nuclear spins, although the 13 C and 15 N sites of biocompatible agents are the key targets due to their widespread use in biochemical pathways. Moreover, their long T1 allows hyperpolarized states to be retained for up to tens of minutes. Signal amplification by reversible exchange (SABRE) is a low-cost and ultrafast hyperpolarization technique that has been shown to be versatile for the hyperpolarization of 15 N nuclei. Although large sensitivity gains are enabled by hyperpolarization, 15 N natural abundance is only ∼0.4 %, so isotopic labeling of the molecules to be hyperpolarized is required in order to take full advantage of the hyperpolarized state. Herein, we describe selected advances in the preparation of 15 N-labeled compounds with the primary emphasis on using these compounds for SABRE polarization in microtesla magnetic fields through spontaneous polarization transfer from parahydrogen. Also, these principles can certainly be applied for hyperpolarization of these emerging contrast agents using dynamic nuclear polarization and other techniques.
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Affiliation(s)
- Nikita V Chukanov
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
| | - Roman V Shchepin
- Department of Chemistry, Biology, and Health Sciences, South Dakota School of Mines & Technology, Rapid City, SD 57701, USA
| | - Sameer M Joshi
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
| | - Mohammad S H Kabir
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
| | - Oleg G Salnikov
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
- Boreskov Institute of Catalysis SB RAS, Acad. Lavrentiev Prospekt 5, 630090, Novosibirsk, Russia
| | - Alexandra Svyatova
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
| | - Igor V Koptyug
- International Tomography Center, SB RAS, Institutskaya St. 3A, 630090, Novosibirsk, Russia
| | - Juri G Gelovani
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
- College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, UAE
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, MI 48202, USA
- Russian Academy of Sciences (RAS), Leninskiy Prospekt 14, 119991, Moscow, Russia
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Chukanov NV, Salnikov OG, Trofimov IA, Kabir MSH, Kovtunov KV, Koptyug IV, Chekmenev EY. Synthesis and 15 N NMR Signal Amplification by Reversible Exchange of [ 15 N]Dalfampridine at Microtesla Magnetic Fields. Chemphyschem 2021; 22:960-967. [PMID: 33738893 DOI: 10.1002/cphc.202100109] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/18/2021] [Indexed: 01/10/2023]
Abstract
Signal Amplification by Reversible Exchange (SABRE) technique enables nuclear spin hyperpolarization of wide range of compounds using parahydrogen. Here we present the synthetic approach to prepare 15 N-labeled [15 N]dalfampridine (4-amino[15 N]pyridine) utilized as a drug to reduce the symptoms of multiple sclerosis. The synthesized compound was hyperpolarized using SABRE at microtesla magnetic fields (SABRE-SHEATH technique) with up to 2.0 % 15 N polarization. The 7-hour-long activation of SABRE pre-catalyst [Ir(IMes)(COD)Cl] in the presence of [15 N]dalfampridine can be remedied by the use of pyridine co-ligand for catalyst activation while retaining the 15 N polarization levels of [15 N]dalfampridine. The effects of experimental conditions such as polarization transfer magnetic field, temperature, concentration, parahydrogen flow rate and pressure on 15 N polarization levels of free and equatorial catalyst-bound [15 N]dalfampridine were investigated. Moreover, we studied 15 N polarization build-up and decay at magnetic field of less than 0.04 μT as well as 15 N polarization decay at the Earth's magnetic field and at 1.4 T.
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Affiliation(s)
- Nikita V Chukanov
- International Tomography Center SB RAS, 3A Institutskaya St., 630090, Novosibirsk, Russia.,Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090, Novosibirsk, Russia
| | - Oleg G Salnikov
- International Tomography Center SB RAS, 3A Institutskaya St., 630090, Novosibirsk, Russia.,Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090, Novosibirsk, Russia.,Boreskov Institute of Catalysis SB RAS, 5 Acad. Lavrentiev Pr., 630090, Novosibirsk, Russia
| | - Ivan A Trofimov
- International Tomography Center SB RAS, 3A Institutskaya St., 630090, Novosibirsk, Russia.,Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090, Novosibirsk, Russia
| | - Mohammad S H Kabir
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, Michigan 48202, United States
| | - Kirill V Kovtunov
- International Tomography Center SB RAS, 3A Institutskaya St., 630090, Novosibirsk, Russia.,Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090, Novosibirsk, Russia
| | - Igor V Koptyug
- International Tomography Center SB RAS, 3A Institutskaya St., 630090, Novosibirsk, Russia
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Karmanos Cancer Institute (KCI), Wayne State University, Detroit, Michigan 48202, United States.,Russian Academy of Sciences, 14 Leninskiy Prospekt, 119991, Moscow, Russia
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