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Enomoto A, Kato N, Shirouzu N, Tamura C, Ichikawa K. Imaging analysis for multiple paramagnetic agents using OMRI and electrophoresis. J Clin Biochem Nutr 2022; 70:103-107. [PMID: 35400821 PMCID: PMC8921720 DOI: 10.3164/jcbn.20-172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 07/05/2021] [Indexed: 11/22/2022] Open
Abstract
Nitroxides have been widely used as a molecular probe for analysis of various diseases models. This article describes an analytical method for separation and semi-quantification of multiple paramagnetic contrast agents with simple procedure combining electrophoresis and Overhauser enhancement magnetic resonance imaging (OMRI) imaging. We used three nitroxides, 3-carbamoyl PROXYL, 3-carboxy PROXYL, and CAT-1, which have different ionic charges in the molecule. In addition, we showed that this method could apply for in vitro measurement using biological sample. The results showed the nitroxides were successfully separated with electrophoresis depending on their charge, and their separation was visualized with OMRI after electrophoresis. Vehicle media such as whole blood did not affect the electrophoresis results and OMRI enhancement factor. Thus, the method can be used to analyze the redox status of biological samples without preprocessing. This analytical method enables in vitro measurement of biological samples to determine the redox status of specific tissue layers using paramagnetic agents, which is helpful for detailed analysis of redox-related diseases.
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Affiliation(s)
- Ayano Enomoto
- Department of Biophysical Chemistry, Faculty of Pharmaceutical Sciences, Nagasaki International University
| | - Nao Kato
- Innovation Center for Medical Redox Navigation, Kyushu University
| | - Naomi Shirouzu
- Innovation Center for Medical Redox Navigation, Kyushu University
| | - Chihiro Tamura
- Innovation Center for Medical Redox Navigation, Kyushu University
| | - Kazuhiro Ichikawa
- Department of Biophysical Chemistry, Faculty of Pharmaceutical Sciences, Nagasaki International University
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Waddington DEJ, Sarracanie M, Salameh N, Herisson F, Ayata C, Rosen MS. An Overhauser-enhanced-MRI platform for dynamic free radical imaging in vivo. NMR IN BIOMEDICINE 2018; 31:e3896. [PMID: 29493032 DOI: 10.1002/nbm.3896] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 12/20/2017] [Accepted: 12/21/2017] [Indexed: 06/08/2023]
Abstract
Overhauser-enhanced MRI (OMRI) is an electron-proton double-resonance imaging technique of interest for its ability to non-invasively measure the concentration and distribution of free radicals. In vivo OMRI experiments are typically undertaken at ultra-low magnetic field (ULF), as both RF power absorption and penetration issues-a consequence of the high resonance frequencies of electron spins-are mitigated. However, working at ULF causes a drastic reduction in MRI sensitivity. Here, we report on the design, construction and performance of an OMRI platform optimized for high NMR sensitivity and low RF power absorbance, exploring challenges unique to probe design in the ULF regime. We use this platform to demonstrate dynamic imaging of TEMPOL in a rat model. The work presented here demonstrates improved speed and sensitivity of in vivo OMRI, extending the scope of OMRI to the study of dynamic processes such as metabolism.
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Affiliation(s)
- David E J Waddington
- A. A. Martinos Center for Biomedical Imaging, 149 Thirteenth St., Charlestown, MA 02129, USA
- Department of Physics, Harvard University, 17 Oxford St, Cambridge, MA 02138, USA
- ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney, NSW 2006, Australia
| | - Mathieu Sarracanie
- A. A. Martinos Center for Biomedical Imaging, 149 Thirteenth St., Charlestown, MA 02129, USA
- Department of Physics, Harvard University, 17 Oxford St, Cambridge, MA 02138, USA
- Harvard Medical School, 25 Shattuck St., Boston, MA 02115, USA
| | - Najat Salameh
- A. A. Martinos Center for Biomedical Imaging, 149 Thirteenth St., Charlestown, MA 02129, USA
- Department of Physics, Harvard University, 17 Oxford St, Cambridge, MA 02138, USA
- Harvard Medical School, 25 Shattuck St., Boston, MA 02115, USA
| | - Fanny Herisson
- Stroke and Neurovascular Regulation Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital/Harvard Medical School, Charlestown, MA 02129, USA
| | - Cenk Ayata
- Harvard Medical School, 25 Shattuck St., Boston, MA 02115, USA
- Stroke and Neurovascular Regulation Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital/Harvard Medical School, Charlestown, MA 02129, USA
| | - Matthew S Rosen
- A. A. Martinos Center for Biomedical Imaging, 149 Thirteenth St., Charlestown, MA 02129, USA
- Department of Physics, Harvard University, 17 Oxford St, Cambridge, MA 02138, USA
- Harvard Medical School, 25 Shattuck St., Boston, MA 02115, USA
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Enomoto A, Hirata H. Parallel image-acquisition in continuous-wave electron paramagnetic resonance imaging with a surface coil array: Proof-of-concept experiments. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2014; 239:29-33. [PMID: 24374749 DOI: 10.1016/j.jmr.2013.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 12/03/2013] [Accepted: 12/04/2013] [Indexed: 06/03/2023]
Abstract
This article describes a feasibility study of parallel image-acquisition using a two-channel surface coil array in continuous-wave electron paramagnetic resonance (CW-EPR) imaging. Parallel EPR imaging was performed by multiplexing of EPR detection in the frequency domain. The parallel acquisition system consists of two surface coil resonators and radiofrequency (RF) bridges for EPR detection. To demonstrate the feasibility of this method of parallel image-acquisition with a surface coil array, three-dimensional EPR imaging was carried out using a tube phantom. Technical issues in the multiplexing method of EPR detection were also clarified. We found that degradation in the signal-to-noise ratio due to the interference of RF carriers is a key problem to be solved.
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Affiliation(s)
- Ayano Enomoto
- Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, North 14, West 9, Kita-ku, Sapporo 060-0814, Japan
| | - Hiroshi Hirata
- Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, North 14, West 9, Kita-ku, Sapporo 060-0814, Japan.
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Enomoto A, Emoto M, Fujii H, Hirata H. Four-channel surface coil array for sequential CW-EPR image acquisition. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2013; 234:21-29. [PMID: 23832070 DOI: 10.1016/j.jmr.2013.06.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 06/05/2013] [Accepted: 06/10/2013] [Indexed: 06/02/2023]
Abstract
This article describes a four-channel surface coil array to increase the area of visualization for continuous-wave electron paramagnetic resonance (CW-EPR) imaging. A 776-MHz surface coil array was constructed with four independent surface coil resonators and three kinds of switches. Control circuits for switching the resonators were also built to sequentially perform EPR image acquisition for each resonator. The resonance frequencies of the resonators were shifted using PIN diode switches to decouple the inductively coupled coils. To investigate the area of visualization with the surface coil array, three-dimensional EPR imaging was performed using a glass cell phantom filled with a solution of nitroxyl radicals. The area of visualization obtained with the surface coil array was increased approximately 3.5-fold in comparison to that with a single surface coil resonator. Furthermore, to demonstrate the applicability of this surface coil array to animal imaging, three-dimensional EPR imaging was performed in a living mouse with an exogenously injected nitroxyl radical imaging agent.
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Affiliation(s)
- Ayano Enomoto
- Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, North 14, West 9, Kita-ku, Sapporo 060-0814, Japan
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