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Halder R, Ma G, Rickmeier J, McDaniel JW, Petzold R, Neumann CN, Murphy JM, Ritter T. Deoxyfluorination of phenols for chemoselective 18F-labeling of peptides. Nat Protoc 2023; 18:3614-3651. [PMID: 37853158 DOI: 10.1038/s41596-023-00890-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 07/14/2023] [Indexed: 10/20/2023]
Abstract
The challenge of forming C-18F bonds is often a bottleneck in the development of new 18F-labeled tracer molecules for noninvasive functional imaging studies using positron emission tomography (PET). Nucleophilic aromatic substitution is the most widely employed reaction to functionalize aromatic substrates with the radioactive fluorine-18 but its scope is restricted to arenes containing electron-withdrawing substituents. Furthermore, many protic functional groups are incompatible with basic fluoride anions. Peptide substrates, which are highly desirable targets for PET molecular imaging, are particularly challenging to label with fluorine-18 because they are densely functionalized and sensitive to high temperatures and basic conditions. To expand the utility of nucleophilic aromatic substitution with fluorine-18, we describe two complementary procedures for the radiodeoxyfluorination of bench-stable and easy-to-access phenols that ensure rapid access to densely functionalized electron-rich and electron-poor 18F-aryl fluorides. The first procedure details the synthesis of an 18F-synthon and its subsequent ligation to the cysteine residue of Arg-Gly-Asp-Cys in 10.5 h from commercially available starting materials (189-min radiosynthesis). The second procedure describes the incorporation of commercially available CpRu(Fmoc-tyrosine)OTf into a fully protected peptide Lys-Met-Glu-(CpRu-Tyr)-Leu via solid-phase peptide synthesis and subsequent ruthenium-mediated uronium deoxyfluorination with fluorine-18 followed by deprotection, accomplished within 7 d (116-min radiosynthesis). Both radiolabeling methods are highly chemoselective and have conveniently been automated using commercially available radiosynthesis equipment so that the procedures described can be employed for the synthesis of peptide-based PET probes for in vivo imaging studies according to as low as reasonably achievable (ALARA) principles.
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Affiliation(s)
- Riya Halder
- Department of Organic Synthesis, Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany
| | - Gaoyuan Ma
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, USA
- Strateos Inc., San Diego, CA, USA
| | - Jens Rickmeier
- Department of Organic Synthesis, Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
| | - James W McDaniel
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA, USA
| | - Roland Petzold
- Department of Organic Synthesis, Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
| | - Constanze N Neumann
- Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany.
| | - Jennifer M Murphy
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, USA.
| | - Tobias Ritter
- Department of Organic Synthesis, Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany.
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Si Z, Cheng Y, Xu Z, Shi D, Shi H, Cheng D. Exploration of 68Ga-DOTA-MAL as a Versatile Vehicle for Facile Labeling of a Variety of Thiol-Containing Bioactive Molecules. ACS OMEGA 2023; 8:4747-4755. [PMID: 36777559 PMCID: PMC9909812 DOI: 10.1021/acsomega.2c06720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 01/19/2023] [Indexed: 06/18/2023]
Abstract
Efficient and site-specific radiolabeling reactions are essential in molecular probe synthesis. Thus, selecting an effective method for radiolabeling that does not affect bioactivity of the molecule is critical. Varieties of bifunctional chelating agents provide a solution in this matter. As a chemo-specific chelator, maleimido-mono-amide-DOTA (DOTA-Mal) holds significant potential for 68Ga labeling of bioactive molecules; it can react specifically with free sulfhydryl groups under mild conditions. Compared with amino and carboxylic acid groups, free sulfhydryl groups are relatively less common in most biomolecules and can serve as site-specific radiolabeling targets. Labeling of 68Ga usually employs a two-step labeling strategy; first, chelators are conjugated to the biomolecules, which is followed by radiolabeling. However, the bioactivity of biomolecules may be affected by harsh labeling conditions. In this study, three 68Ga-labeled bioactive molecules, namely, 68Ga-DOTA-RGD, 68Ga-DOTA-FA, and 68Ga-DOTA-BSA, were prepared using a novel strategy under mild conditions (pH of 8.0 at room temperature). Using this strategy, DOTA-Mal was labeled by 68Ga before it reacted with the sulfhydryl group-containing biomolecules, which avoided damage to said biomolecules caused by the harsh reaction conditions required in 68Ga-labeling procedures. The biological and chemical properties of these three radiotracers synthesized using this strategy are well manifested. Through a series of experiments, the effectiveness of this strategy is demonstrated, and we believe that this site-specific bioactivity-friendly reaction strategy will facilitate developments and translation applications of varieties of 68Ga-labeled positron emission tomography probes.
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Affiliation(s)
- Zhan Si
- Department
of Nuclear Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Institute
of Nuclear Medicine, Fudan University, Shanghai 200032, China
- Shanghai
Institute of Medical Imaging, Shanghai 200032, China
| | - Yuan Cheng
- Department
of Nuclear Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Institute
of Nuclear Medicine, Fudan University, Shanghai 200032, China
- Shanghai
Institute of Medical Imaging, Shanghai 200032, China
| | - Zhan Xu
- Department
of Nuclear Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Institute
of Nuclear Medicine, Fudan University, Shanghai 200032, China
- Shanghai
Institute of Medical Imaging, Shanghai 200032, China
| | - Dai Shi
- Department
of Nuclear Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Institute
of Nuclear Medicine, Fudan University, Shanghai 200032, China
- Shanghai
Institute of Medical Imaging, Shanghai 200032, China
| | - Hongcheng Shi
- Department
of Nuclear Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Institute
of Nuclear Medicine, Fudan University, Shanghai 200032, China
- Shanghai
Institute of Medical Imaging, Shanghai 200032, China
| | - Dengfeng Cheng
- Department
of Nuclear Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Institute
of Nuclear Medicine, Fudan University, Shanghai 200032, China
- Shanghai
Institute of Medical Imaging, Shanghai 200032, China
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Hu M, Yang L, Liu N, Long R, Zhou L, Zhao W, Feng Y, Wang C, Li Z, Chen Y, Wang L. Evaluation of sulfone-labeled amino acid derivatives as potential PET agents for cancer imaging. Nucl Med Biol 2023; 116-117:108311. [PMID: 36580767 DOI: 10.1016/j.nucmedbio.2022.108311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 12/12/2022] [Accepted: 12/19/2022] [Indexed: 12/25/2022]
Abstract
INTRODUCTION As one of the most important and frequently used molecular imaging techniques in the clinic, positron emission tomography (PET) features high sensitivity and specificity, which generally involves the use of PET contrast agents. Despite the exceptional promise, the availability of novel PET agents could limit its application and there is a clear need to develop new PET agents to improve our understanding of targets of interest and increase the diagnostic specificity. METHODS Based on the fact that amino acid transport and protein anabolism are increased in tumor tissues, a series of 18F-labeled amino acid analog was labeled with 18F by using [18F]fluoro-4-(vinylsulfonyl)benzene as the radionuclide linker. The obtained probes were subjected to in vitro and in vivo evaluation, including stability, cell line transport channel specificity, PET/CT imaging on tumor and inflammation bearing mice, and biodistribution. RESULTS Our data shows that [18F]2a had moderate decay corrected labeling yield (>42 %) and high radiochemical purity (>99 %). When tested in vivo, the uptake of [18F]2a was 1.5 ± 0.2%ID/g in NCI-H1975 tumors and 1.1 ± 0.2%ID/g in inflammatory tissues. In contrast, the values for [18F]FDG were 5.7 ± 0.2%ID/g and 4.8 ± 0.1%ID/g, respectively. The inflammatory lesion-to-muscle contrast is 2.4 for [18F]2a, which is 3.0 for [18F]FDG. CONCLUSION Clearly, [18F]2a hold the great potential for cancer imaging. Its application in distinguishing tumor from inflammatory lesion would still need to be investigated further.
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Affiliation(s)
- Mei Hu
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China; School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China
| | - Liping Yang
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China; School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China
| | - Nan Liu
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China
| | - Ruiling Long
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China; School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China
| | - Liu Zhou
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China; School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China
| | - Weiling Zhao
- Department of Radiology, Lineberger Comprehensive Cancer Center, and Biomedical Research Imaging Center, University of North Carolina, Chapel Hill, NC, USA
| | - Yue Feng
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China
| | - Changjiang Wang
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China; School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China
| | - Zibo Li
- Department of Radiology, Lineberger Comprehensive Cancer Center, and Biomedical Research Imaging Center, University of North Carolina, Chapel Hill, NC, USA.
| | - Yue Chen
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China.
| | - Li Wang
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No. 25 Taiping St, Jiangyang District, Luzhou, Sichuan, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan, China; Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China.
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McDaniel JW, Stauber JM, Doud EA, Spokoyny AM, Murphy JM. An Organometallic Gold(III) Reagent for 18F Labeling of Unprotected Peptides and Sugars in Aqueous Media. Org Lett 2022; 24:5132-5136. [PMID: 35802398 DOI: 10.1021/acs.orglett.2c01965] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 18F labeling of unprotected peptides and sugars with a Au(III)-[18F]fluoroaryl complex is reported. The chemoselective method generates 18F-labeled S-aryl bioconjugates in an aqueous environment in 15 min with high radiochemical yields and displays excellent functional group tolerance. This approach utilizes an air and moisture stable, robust organometallic Au(III) complex and highlights the versatility of designer organometallic reagents as efficient agents for rapid radiolabeling.
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Affiliation(s)
- James W McDaniel
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Julia M Stauber
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Evan A Doud
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Alexander M Spokoyny
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Jennifer M Murphy
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California, Los Angeles, California 90095, United States
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Narayanam MK, Lai BT, Loredo JM, Wilson JA, Eliasen AM, LaBerge NA, Nason M, Cantu AL, Luton BK, Xu S, Agnew HD, Murphy JM. Positron Emission Tomography Tracer Design of Targeted Synthetic Peptides via 18F-Sydnone Alkyne Cycloaddition. Bioconjug Chem 2021; 32:2073-2082. [PMID: 34415731 DOI: 10.1021/acs.bioconjchem.1c00379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Chemically synthesized, small peptides that bind with high affinity and specificity to CD8-expressing (CD8+) tumor-infiltrating T cells, yet retain the desirable characteristics of small molecules, hold valuable potential for diagnostic molecular imaging of immune response. Here, we report the development of 18F-labeled peptides targeting human CD8α with nanomolar affinity via the strain-promoted sydnone-alkyne cycloaddition with 4-[18F]fluorophenyl sydnone. The 18F-sydnone is produced in one step, in high radiochemical yield, and the peptide labeling proceeds rapidly. A hydrophilic chemical linker results in a tracer with favorable pharmacokinetic properties and improved image contrast, as demonstrated by in vivo PET imaging studies.
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Affiliation(s)
- Maruthi Kumar Narayanam
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California 90095, United States
| | - Bert T Lai
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Jacquie Malette Loredo
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Jeré A Wilson
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Anders M Eliasen
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Nicole A LaBerge
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Malley Nason
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Annabelle L Cantu
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Breanna K Luton
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Shili Xu
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California 90095, United States
| | - Heather D Agnew
- Indi Molecular, Inc., 6162 Bristol Parkway, Culver City, California 90230, United States
| | - Jennifer M Murphy
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California 90095, United States
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Aime S, Al-Qahtani M, Behe M, Bormans G, Carlucci G, DaSilva JN, Decristoforo C, Duatti A, Elsinga PH, Kopka K, Li XG, Liu Z, Mach RH, Middel O, Passchier J, Patt M, Penuelas I, Rey A, Scott PJH, Todde S, Toyohara J, Vugts D, Yang Z. Highlight selection of radiochemistry and radiopharmacy developments by editorial board. EJNMMI Radiopharm Chem 2021; 6:13. [PMID: 33738618 PMCID: PMC7973323 DOI: 10.1186/s41181-021-00128-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 03/03/2021] [Indexed: 11/11/2022] Open
Abstract
Background The Editorial Board of EJNMMI Radiopharmacy and Chemistry releases a biyearly highlight commentary to update the readership on trends in the field of radiopharmaceutical development. Results This commentary of highlights has resulted in 23 different topics selected by each member of the Editorial Board addressing a variety of aspects ranging from novel radiochemistry to first in man application of novel radiopharmaceuticals. Conclusion Trends in radiochemistry and radiopharmacy are highlighted demonstrating the progress in the research field being the scope of EJNMMI Radiopharmacy and Chemistry.
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Affiliation(s)
| | | | - Martin Behe
- Paul Scherrer Institute, Villigen, Switzerland
| | - Guy Bormans
- Katholieke Universiteit Leuven, Leuven, Belgium
| | - Giuseppe Carlucci
- UCLA Molecular and Medical Pharmacology Department, Los Angeles, USA
| | | | | | | | - Philip H Elsinga
- University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Klaus Kopka
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany.
| | | | | | | | | | | | | | | | - Ana Rey
- Universidad de la Republica, Montevideo, Uruguay
| | | | | | - Jun Toyohara
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | | | - Zhi Yang
- Peking University Cancer Hospital, Beijing, China
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