H4picoopaRobust Chelate for 225Ac/111In Theranostics

The nuclear decay characteristics of 225Ac (E α = 5–8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t 1/2 = 9.92 days) are well recognized as advantageous for the treatment of primary and metastatic tumors; however, suitable chelation systems are required, which can accommodate this radiometal. S...

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Published inBioconjugate chemistry Vol. 33; no. 10; pp. 1900 - 1921
Main Authors Wharton, Luke, Jaraquemada-Peláez, María de Guadalupe, Zhang, Chengcheng, Zeisler, Jutta, Rodríguez-Rodríguez, Cristina, Osooly, Maryam, Radchenko, Valery, Yang, Hua, Lin, Kuo-Shyan, Bénard, François, Schaffer, Paul, Orvig, Chris
Format Journal Article
LanguageEnglish
Published WASHINGTON American Chemical Society 19.10.2022
Amer Chemical Soc
Subjects
Online AccessGet full text
ISSN1043-1802
1520-4812
1520-4812
DOI10.1021/acs.bioconjchem.2c00364

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Abstract The nuclear decay characteristics of 225Ac (E α = 5–8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t 1/2 = 9.92 days) are well recognized as advantageous for the treatment of primary and metastatic tumors; however, suitable chelation systems are required, which can accommodate this radiometal. Since 225Ac does not possess any suitable low-energy, high abundance γ-ray emissions for nuclear imaging, there is a clear need for the development of other companion radionuclides with similar coordination characteristics and comparable half-lives, which can be applied in diagnostics. H4picoopa was designed and executed as a high-denticity ligand for chelation of [225Ac]­Ac3+, and the complexation characteristics have been explored through nuclear magnetic resonance (NMR) spectroscopy, solution thermodynamic stability studies, and radiolabeling. The ligand shows highly favorable complexation with La3+ (pM = 17.6), Lu3+ (pM = 21.3), and In3+ (pM = 31.2) and demonstrates effective radiolabeling of both [225Ac]­Ac3+ and [111In]­In3+ ions achieving quantitative radiochemical conversions (RCCs) under mild conditions (RT, 10 min), accompanied by high serum stability (>97% radiochemical purity (RCP) over 6 days). A bifunctional analogue of H4picoopa was synthesized and conjugated to the Pip-Nle-CycMSHhex peptide for targeting of MC1R positive melanoma tumors. In vivo single-photon emission computed tomography (SPECT) and biodistribution studies of the 111In-radiolabeled bioconjugate in mice bearing B16-F10 tumors showed good radiotracer stability, although improved tumor targeting could not be achieved for imaging purposes. This work highlights H4picoopa as a very promising platform for application of [225Ac]­Ac3+ and [111In]­In3+ as a theranostic pair and allows great versatility for the incorporation of other directing vectors. The logical synthetic approach reported here for bifunctional H4picoopa, involving an azide-functionalized covalent linker and CuI-catalyzed alkyne-azide cycloaddition, allows for ease of optimization of bioconjugate pharmacokinetics and will be valuable for further radiopharmaceutical applications moving forward.
AbstractList The nuclear decay characteristics of 225Ac (E α = 5–8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t 1/2 = 9.92 days) are well recognized as advantageous for the treatment of primary and metastatic tumors; however, suitable chelation systems are required, which can accommodate this radiometal. Since 225Ac does not possess any suitable low-energy, high abundance γ-ray emissions for nuclear imaging, there is a clear need for the development of other companion radionuclides with similar coordination characteristics and comparable half-lives, which can be applied in diagnostics. H4picoopa was designed and executed as a high-denticity ligand for chelation of [225Ac]­Ac3+, and the complexation characteristics have been explored through nuclear magnetic resonance (NMR) spectroscopy, solution thermodynamic stability studies, and radiolabeling. The ligand shows highly favorable complexation with La3+ (pM = 17.6), Lu3+ (pM = 21.3), and In3+ (pM = 31.2) and demonstrates effective radiolabeling of both [225Ac]­Ac3+ and [111In]­In3+ ions achieving quantitative radiochemical conversions (RCCs) under mild conditions (RT, 10 min), accompanied by high serum stability (>97% radiochemical purity (RCP) over 6 days). A bifunctional analogue of H4picoopa was synthesized and conjugated to the Pip-Nle-CycMSHhex peptide for targeting of MC1R positive melanoma tumors. In vivo single-photon emission computed tomography (SPECT) and biodistribution studies of the 111In-radiolabeled bioconjugate in mice bearing B16-F10 tumors showed good radiotracer stability, although improved tumor targeting could not be achieved for imaging purposes. This work highlights H4picoopa as a very promising platform for application of [225Ac]­Ac3+ and [111In]­In3+ as a theranostic pair and allows great versatility for the incorporation of other directing vectors. The logical synthetic approach reported here for bifunctional H4picoopa, involving an azide-functionalized covalent linker and CuI-catalyzed alkyne-azide cycloaddition, allows for ease of optimization of bioconjugate pharmacokinetics and will be valuable for further radiopharmaceutical applications moving forward.
The nuclear decay characteristics of 225Ac (Eα = 5–8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t1/2 = 9.92 days) are well recognized as advantageous for the treatment of primary and metastatic tumors; however, suitable chelation systems are required, which can accommodate this radiometal. Since 225Ac does not possess any suitable low-energy, high abundance γ-ray emissions for nuclear imaging, there is a clear need for the development of other companion radionuclides with similar coordination characteristics and comparable half-lives, which can be applied in diagnostics. H4picoopa was designed and executed as a high-denticity ligand for chelation of [225Ac]Ac3+, and the complexation characteristics have been explored through nuclear magnetic resonance (NMR) spectroscopy, solution thermodynamic stability studies, and radiolabeling. The ligand shows highly favorable complexation with La3+ (pM = 17.6), Lu3+ (pM = 21.3), and In3+ (pM = 31.2) and demonstrates effective radiolabeling of both [225Ac]Ac3+ and [111In]In3+ ions achieving quantitative radiochemical conversions (RCCs) under mild conditions (RT, 10 min), accompanied by high serum stability (>97% radiochemical purity (RCP) over 6 days). A bifunctional analogue of H4picoopa was synthesized and conjugated to the Pip-Nle-CycMSHhex peptide for targeting of MC1R positive melanoma tumors. In vivo single-photon emission computed tomography (SPECT) and biodistribution studies of the 111In-radiolabeled bioconjugate in mice bearing B16-F10 tumors showed good radiotracer stability, although improved tumor targeting could not be achieved for imaging purposes. This work highlights H4picoopa as a very promising platform for application of [225Ac]Ac3+ and [111In]In3+ as a theranostic pair and allows great versatility for the incorporation of other directing vectors. The logical synthetic approach reported here for bifunctional H4picoopa, involving an azide-functionalized covalent linker and CuI-catalyzed alkyne-azide cycloaddition, allows for ease of optimization of bioconjugate pharmacokinetics and will be valuable for further radiopharmaceutical applications moving forward.
The nuclear decay characteristics of Ac-225 (E-alpha = 5- 8 MeV, linear energy transfer (LET) = similar to 100 keV/mu m, t(1/2) = 9.92 days) are well recognized as advantageous for the treatment of primary and metastatic tumors; however, suitable chelation systems are required, which can accommodate this radiometal. Since Ac-225 does not possess any suitable low-energy, high abundance gamma-ray emissions for nuclear imaging, there is a clear need for the development of other companion radionuclides with similar coordination characteristics and comparable half-lives, which can be applied in diagnostics. H4picoopa was designed and executed as a high-denticity ligand for chelation of [Ac-225]Ac3+, and the complexation characteristics have been explored through nuclear magnetic resonance (NMR) spectroscopy, solution thermodynamic stability studies, and radiolabeling. The ligand shows highly favorable complexation with La3+ (pM = 17.6), Lu3+ (pM = 21.3), and In3+ (pM = 31.2) and demonstrates effective radiolabeling of both [Ac-225]Ac3+ and [In-111]In3+ ions achieving quantitative radiochemical conversions (RCCs) under mild conditions (RT, 10 min), accompanied by high serum stability (> 97% radiochemical purity (RCP) over 6 days). A bifunctional analogue of H4picoopa was synthesized and conjugated to the Pip-Nle-CycMSHhex peptide for targeting of MC1R positive melanoma tumors. In vivo single-photon emission computed tomography (SPECT) and biodistribution studies of the( 111)In-radiolabeled bioconjugate in mice bearing B16-F10 tumors showed good radiotracer stability, although improved tumor targeting could not be achieved for imaging purposes. This work highlights H(4)picoopa as a very promising platform for application of [Ac-225]Ac3+ and [In-111]In(3+ )as a theranostic pair and allows great versatility for the incorporation of other directing vectors. The logical synthetic approach reported here for bifunctional H(4)picoopa, involving an azide-functionalized covalent linker and CuIcatalyzed alkyne-azide cycloaddition, allows for ease of optimization of bioconjugate pharmacokinetics and will be valuable for further radiopharmaceutical applications moving forward.
The nuclear decay characteristics of 225Ac (Eα = 5-8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t1/2 = 9.92 days) are well recognized as advantageous for the treatment of primary and metastatic tumors; however, suitable chelation systems are required, which can accommodate this radiometal. Since 225Ac does not possess any suitable low-energy, high abundance γ-ray emissions for nuclear imaging, there is a clear need for the development of other companion radionuclides with similar coordination characteristics and comparable half-lives, which can be applied in diagnostics. H4picoopa was designed and executed as a high-denticity ligand for chelation of [225Ac]Ac3+, and the complexation characteristics have been explored through nuclear magnetic resonance (NMR) spectroscopy, solution thermodynamic stability studies, and radiolabeling. The ligand shows highly favorable complexation with La3+ (pM = 17.6), Lu3+ (pM = 21.3), and In3+ (pM = 31.2) and demonstrates effective radiolabeling of both [225Ac]Ac3+ and [111In]In3+ ions achieving quantitative radiochemical conversions (RCCs) under mild conditions (RT, 10 min), accompanied by high serum stability (>97% radiochemical purity (RCP) over 6 days). A bifunctional analogue of H4picoopa was synthesized and conjugated to the Pip-Nle-CycMSHhex peptide for targeting of MC1R positive melanoma tumors. In vivo single-photon emission computed tomography (SPECT) and biodistribution studies of the 111In-radiolabeled bioconjugate in mice bearing B16-F10 tumors showed good radiotracer stability, although improved tumor targeting could not be achieved for imaging purposes. This work highlights H4picoopa as a very promising platform for application of [225Ac]Ac3+ and [111In]In3+ as a theranostic pair and allows great versatility for the incorporation of other directing vectors. The logical synthetic approach reported here for bifunctional H4picoopa, involving an azide-functionalized covalent linker and CuI-catalyzed alkyne-azide cycloaddition, allows for ease of optimization of bioconjugate pharmacokinetics and will be valuable for further radiopharmaceutical applications moving forward.The nuclear decay characteristics of 225Ac (Eα = 5-8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t1/2 = 9.92 days) are well recognized as advantageous for the treatment of primary and metastatic tumors; however, suitable chelation systems are required, which can accommodate this radiometal. Since 225Ac does not possess any suitable low-energy, high abundance γ-ray emissions for nuclear imaging, there is a clear need for the development of other companion radionuclides with similar coordination characteristics and comparable half-lives, which can be applied in diagnostics. H4picoopa was designed and executed as a high-denticity ligand for chelation of [225Ac]Ac3+, and the complexation characteristics have been explored through nuclear magnetic resonance (NMR) spectroscopy, solution thermodynamic stability studies, and radiolabeling. The ligand shows highly favorable complexation with La3+ (pM = 17.6), Lu3+ (pM = 21.3), and In3+ (pM = 31.2) and demonstrates effective radiolabeling of both [225Ac]Ac3+ and [111In]In3+ ions achieving quantitative radiochemical conversions (RCCs) under mild conditions (RT, 10 min), accompanied by high serum stability (>97% radiochemical purity (RCP) over 6 days). A bifunctional analogue of H4picoopa was synthesized and conjugated to the Pip-Nle-CycMSHhex peptide for targeting of MC1R positive melanoma tumors. In vivo single-photon emission computed tomography (SPECT) and biodistribution studies of the 111In-radiolabeled bioconjugate in mice bearing B16-F10 tumors showed good radiotracer stability, although improved tumor targeting could not be achieved for imaging purposes. This work highlights H4picoopa as a very promising platform for application of [225Ac]Ac3+ and [111In]In3+ as a theranostic pair and allows great versatility for the incorporation of other directing vectors. The logical synthetic approach reported here for bifunctional H4picoopa, involving an azide-functionalized covalent linker and CuI-catalyzed alkyne-azide cycloaddition, allows for ease of optimization of bioconjugate pharmacokinetics and will be valuable for further radiopharmaceutical applications moving forward.
Author Rodríguez-Rodríguez, Cristina
Zhang, Chengcheng
Zeisler, Jutta
Osooly, Maryam
Radchenko, Valery
Wharton, Luke
Yang, Hua
Lin, Kuo-Shyan
Schaffer, Paul
Jaraquemada-Peláez, María de Guadalupe
Bénard, François
Orvig, Chris
AuthorAffiliation Department of Chemistry
Life Sciences Division
Faculty of Pharmaceutical Sciences
Medicinal Inorganic Chemistry Group, Department of Chemistry
Department of Physics and Astronomy
Department of Molecular Oncology
Simon Fraser University
Department of Radiology
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Issue 10
Keywords EQUILIBRIUM-CONSTANTS
MELANOCYTE-STIMULATING HORMONE
STABILITY
MELANOCORTIN-1 RECEPTOR
IN-111
LIGAND
HOCTAPA
DERIVATIVES
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SSID ssj0009182
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Snippet The nuclear decay characteristics of 225Ac (E α = 5–8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t 1/2 = 9.92 days) are well recognized as advantageous...
The nuclear decay characteristics of Ac-225 (E-alpha = 5- 8 MeV, linear energy transfer (LET) = similar to 100 keV/mu m, t(1/2) = 9.92 days) are well...
The nuclear decay characteristics of 225Ac (Eα = 5–8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t1/2 = 9.92 days) are well recognized as advantageous for...
The nuclear decay characteristics of 225Ac (Eα = 5-8 MeV, linear energy transfer (LET) = ∼100 keV/μm, t1/2 = 9.92 days) are well recognized as advantageous for...
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SubjectTerms Alkynes
Biochemical Research Methods
Biochemistry & Molecular Biology
Chelation
Chemistry
Chemistry, Multidisciplinary
Chemistry, Organic
Complexation
Computed tomography
Cycloaddition
Emission analysis
Emissions
Energy transfer
Gamma emission
In vivo methods and tests
Life Sciences & Biomedicine
Ligands
Linear energy transfer (LET)
Medical imaging
Melanoma
Metastases
NMR
NMR spectroscopy
Nuclear magnetic resonance
Optimization
Pharmaceuticals
Pharmacokinetics
Photon emission
Physical Sciences
Precision medicine
Radioactive tracers
Radiochemistry
Radioisotopes
Radiolabelling
Science & Technology
Single photon emission computed tomography
Spectroscopy
Stability
Tumors
Title H4picoopaRobust Chelate for 225Ac/111In Theranostics
URI http://dx.doi.org/10.1021/acs.bioconjchem.2c00364
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