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Lin W, Fonseca Cabrera GO, Aluicio-Sarduy E, Barnhart TE, Mixdorf JC, Li Z, Wu Z, Engle JW. Radiolabeling Diamino sarcophagine with Cyclotron-Produced Cobalt-55 and [ 55Co]Co-NT-Sarcage as a Proof of Concept in a Murine Xenograft Model. Bioconjug Chem 2024; 35:412-418. [PMID: 38411531 PMCID: PMC10954389 DOI: 10.1021/acs.bioconjchem.4c00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
Cobalt-sarcophagine complexes exhibit high kinetic inertness under various stringent conditions, but there is limited literature on radiolabeling and in vivo positron emission tomography (PET) imaging using no carrier added 55Co. To fill this gap, this study first investigates the radiolabeling of DiAmSar (DSar) with 55Co, followed by stability evaluation in human serum and EDTA, pharmacokinetics in mice, and a direct comparison with [55Co]CoCl2 to assess differences in pharmacokinetics. Furthermore, the radiolabeling process was successfully used to generate the NTSR1-targeted PET agent [55Co]Co-NT-Sarcage (a DSar-functionalized SR142948 derivative) and administered to HT29 tumor xenografted mice. The [55Co]Co-DSar complex can be formed at 37 °C with purity and stability suitable for preclinical in vivo radiopharmaceutical applications, and [55Co]Co-NT-Sarcage demonstrated prominent tumor uptake with a low background signal. In a direct comparison with [64Cu]Cu-NT-Sarcage, [55Co]Co-NT-Sarcage achieved a higher tumor-to-liver ratio but with overall similar biodistribution profile. These results demonstrate that Sar would be a promising chelator for constructing Co-based radiopharmaceuticals including 55Co for PET and 58mCo for therapeutic applications.
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Affiliation(s)
- Wilson Lin
- Department of Medical Physics, University of Wisconsin, 1111 Highland Ave., Madison, WI 53705, United States
| | - German Oscar Fonseca Cabrera
- Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, NC 27599, United States
| | - Eduardo Aluicio-Sarduy
- Department of Medical Physics, University of Wisconsin, 1111 Highland Ave., Madison, WI 53705, United States
| | - Todd E. Barnhart
- Department of Medical Physics, University of Wisconsin, 1111 Highland Ave., Madison, WI 53705, United States
| | - Jason C. Mixdorf
- Department of Medical Physics, University of Wisconsin, 1111 Highland Ave., Madison, WI 53705, United States
| | - Zibo Li
- Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, NC 27599, United States
| | - Zhanhong Wu
- Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, NC 27599, United States
| | - Jonathan W. Engle
- Department of Medical Physics, University of Wisconsin, 1111 Highland Ave., Madison, WI 53705, United States
- Department of Radiology, University of Wisconsin, 600 Highland Ave., Madison, WI, 53792, United States
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Donnelly PS, Harrowfield JM, Koutsantonis GA, Lengkeek NA, Ling I, Nealon GL, McInnes LE, Skelton BW, Sobolev AN, White AH, White JM. Inert Transition Metal Ion Complexes in Organic Synthesis: Protection and Activation. Chem Asian J 2023; 18:e202300556. [PMID: 37442812 DOI: 10.1002/asia.202300556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/10/2023] [Accepted: 07/13/2023] [Indexed: 07/15/2023]
Abstract
Single-crystal X-ray diffraction studies for a variety of metal ion complexes of functionalised sarcophagines (sarcophagine=sar=3,6,10,13,16,19-hexa-azabicyclo[6.6.6]icosane) have further confirmed not only that the form of the metal ion/sar unit is unique for each metal, albeit with a sensitivity of the conformation to the associated counter anions, but also that for any given metal and ligand substituent, the dimensions (bond lengths and angles) of the complex and the substituent at the secondary nitrogen centres do not differ significantly from those of the isolated components. Despite this, where the substituent contains reactive sites, the reactivity differs markedly from that of their form in an uncoordinated substrate. Rationalisations are offered for these differences, in part through the use of Hirshfeld surface analysis of the intermolecular interactions. The kinetic inertness of the complexes means that the metal ions can be considered to act as regioselective protecting groups.
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Affiliation(s)
- Paul S Donnelly
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Jack M Harrowfield
- Institut de Science et d'Ingénierie Supramoléculaires, Université de Strasbourg, Strasbourg, 67083, France
| | - George A Koutsantonis
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Nigel A Lengkeek
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Irene Ling
- School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 47500, Selangor, Malaysia
| | - Gareth L Nealon
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Lachlan E McInnes
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Brian W Skelton
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Alexandre N Sobolev
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | | | - Jonathan M White
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria, 3010, Australia
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