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Saini S, Bhupathiraju NDK, Jayawardana SB, Phipps MD, Lewis JS, Francesconi LC, Wijeratne GB, Deri MA, Lapi SE. [ 45Ti]Ti-HOPOs: Potential Complexes for the Development of 45Ti PET Imaging Agents. ACS OMEGA 2025; 10:7306-7316. [PMID: 40028061 PMCID: PMC11866203 DOI: 10.1021/acsomega.4c05544] [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: 12/06/2024] [Revised: 01/08/2025] [Accepted: 01/17/2025] [Indexed: 03/05/2025]
Abstract
Titanium-45 (45Ti) is a radionuclide with desirable physical characteristics for use in positron emission tomography (PET) imaging including a moderate half-life (3.08 h), decay by positron emission (85%), and low mean positron energy of 0.439 MeV. Despite these promising characteristics, the radiochemistry for 45Ti including the development of suitable bifunctional chelators is relatively unexplored compared to that of other radiometals. This work investigated three hydroxypyridinone compounds, viz., 3,2,3-(LI-1,2-HOPO) or C8-HOPO, 3,3,3-(LI-1,2-HOPO) or C9-HOPO, 3,4,3-(LI-1,2-HOPO) or C10-HOPO as potential chelators for 45Ti. Radiolabeling optimization, stability, and biodistribution results demonstrated C9-HOPO to be a promising chelator for 45Ti. In vivo evaluation of the [45Ti]Ti-C9-HOPO complex indicated rapid clearance with no signs of decomplexation.
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Affiliation(s)
- Shefali Saini
- Department
of Radiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
- Department
of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
| | - N.V.S. Dinesh K. Bhupathiraju
- Department
of Chemistry, City University of New York
Hunter College, 695 Park
Avenue, New York, New York 10021, United States
| | - Samith B. Jayawardana
- Department
of Chemistry and Biochemistry, University
of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Michael D. Phipps
- Department
of Chemistry, City University of New York
Hunter College, 695 Park
Avenue, New York, New York 10021, United States
- Ph.D.
Program in Chemistry, The Graduate Center
of the City University of New York, New York, New York 10016, United States
- Molecular
Pharmacology Program and the Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Jason S. Lewis
- Molecular
Pharmacology Program and the Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Lynn C. Francesconi
- Department
of Chemistry, City University of New York
Hunter College, 695 Park
Avenue, New York, New York 10021, United States
- Ph.D.
Program in Chemistry, The Graduate Center
of the City University of New York, New York, New York 10016, United States
| | - Gayan B. Wijeratne
- Department
of Chemistry and Biochemistry, University
of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Melissa A. Deri
- Ph.D.
Program in Chemistry, The Graduate Center
of the City University of New York, New York, New York 10016, United States
- Department
of Chemistry, Lehman College of the City
University of New York, Bronx, New York 10468, United States
| | - Suzanne E. Lapi
- Department
of Radiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
- Department
of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
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Functionalization of Rhodamine Platforms with 3-Hydroxy-4-pyridinone Chelating Units and Its Fluorescence Behavior towards Fe(III). MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27051567. [PMID: 35268668 PMCID: PMC8911962 DOI: 10.3390/molecules27051567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/20/2022] [Accepted: 02/23/2022] [Indexed: 11/22/2022]
Abstract
Functionalization of xanthene fluorophores with specific receptor units is an important topic of research aiming for the development of new analytical tools for biological sciences, clinical diagnosis, food and environmental monitoring. Herein, we report a new dihydrorosamine containing two active amino groups, which was functionalized with 3-benzyloxy-1-(3′-carboxypropyl)-2-methyl-4-pyridinone through an amide coupling strategy. Benzylated mono- and di-functionalized dihydrorosamine derivatives (H in position 9 of the xanthene) were obtained, but with modest reaction yields, requiring long and laborious purification procedures. Looking for a more efficient approach, rhodamine 110 was selected to react with the carboxypropyl pyridinone, enabling the isolation of the corresponding mono- and di-functionalized derivatives in amounts that depend on the excess of pyridinone added to the reaction. The structure of all compounds was established by 1H and 13C NMR, MS (ESI) and their absorption and emission properties were evaluated in dichloromethane. The fluorescence behavior of the debenzylated mono-rhodamine 110 derivative in the presence of Fe(III) was studied, making it an interesting fluorogenic dye for future optical sensing applications.
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