TY - JOUR
T1 - 3p-C-NETA
T2 - A versatile and effective chelator for development of Al18F-labeled and therapeutic radiopharmaceuticals
AU - Ahenkorah, Stephen
AU - Murce, Erika
AU - Cawthorne, Christopher
AU - Ketchemen, Jessica Pougoue
AU - Deroose, Christophe M.
AU - Cardinaels, Thomas
AU - Seimbille, Yann
AU - Fonge, Humphrey
AU - Gsell, Willy
AU - Bormans, Guy
AU - Ooms, Maarten
AU - Cleeren, Frederik
N1 - Score=10
Funding Information:
SCK CEN Academy support is gratefully acknowledged. This research was funded by the Education and Research Foundation for Nuclear Medicine and Molecular imaging and Neuroendocrine Tumor Research Foundation (Nuclear Medicine Pilot research grant in Neuroendocrine Tumors, F. Cleeren). Christophe M. Deroose is a Senior Clinical Investigator at the FWO. Christopher Cawthorne was funded by FWO I000321N. We acknowledge infrastructure (preclinical PET/MRI scanner) funding from ‘Stichting tegen kanker’ (STK 2015-145).
PY - 2022
Y1 - 2022
N2 - Background: Radiolabeled somatostatin analogues (e.g. [68Ga]Ga-DOTATATE and [177Lu]Lu-DOTATATE) have been used to diagnose, monitor, and treat neuroendocrine tumour (NET) patients with great success. [18F]AlF-NOTA-octreotide, a promising 18F-labeled somatostatin analogue and potential alternative for 68Ga-DOTA-peptides, is under clinical evaluation. However, ideally, the same precursor (combination of chelator-linker-vector) can be used for production of both diagnostic and therapeutic radiopharmaceuticals with very similar (e.g. Al18F-method in combination with therapeutic radiometals 213Bi/177Lu) or identical (e.g. complementary Tb-radionuclides) pharmacokinetic properties, allowing for accurate personalised dosimetry estimation and radionuclide therapy of NET patients. In this study we evaluated 3p-C-NETA, as potential theranostic Al18F-chelator and present first results of radiosynthesis and preclinical evaluation of [18F]AlF-3p-C-NETA-TATE. Methods: 3p-C-NETA was synthesized and radiolabeled with diagnostic (68Ga, Al18F) or therapeutic (177Lu, 161Tb, 213Bi, 225Ac and 67Cu) radionuclides at different temperatures (25-95 °C). The in vitro stability of the corresponding radiocomplexes was determined in phosphate-buffered saline (PBS) and human serum. 3p-C-NETA-TATE was synthesized using standard solid/liquid-phase peptide synthesis. [18F]AlF-3p-C-NETA-TATE was synthesized in an automated AllinOne® synthesis module and the in vitro stability of [18F]AlF-3p-C-NETA-TATE was evaluated in formulation buffer, PBS and human serum. [18F]AlF-3p-C-NETA-TATE pharmacokinetics were evaluated using µPET/MRI in healthy rats, with [18F]AlF-NOTA-Octreotide as benchmark. Results: 3p-C-NETA quantitatively sequestered 177Lu, 213Bi and 67Cu at 25 °C while heating was required to bind Al18F, 68Ga, 161Tb and 225Ac efficiently. The [18F]AlF-, [177Lu]Lu- and [161Tb]Tb-3p-C-NETA-complex showed excellent in vitro stability in both PBS and human serum over the study period. In contrast, [67Cu]Cu- and [225Ac]Ac-, [68Ga]Ga-3p-C-NETA were stable in PBS, but not in human serum. [18F]AlF-3p-C-NETA-TATE was obtained in good radiochemical yield and radiochemical purity. [18F]AlF-3p-C-NETA-TATE displayed good in vitro stability for 4 h in all tested conditions. Finally, [18F]AlF-3p-C-NETA-TATE showed excellent pharmacokinetic properties comparable with the results obtained for [18F]AlF-NOTA-Octreotide. Conclusions: 3p-C-NETA is a versatile chelator that can be used for both diagnostic applications (Al18F) and targeted radionuclide therapy (213Bi, 177Lu, 161Tb). It has the potential to be the new theranostic chelator of choice for clinical applications in nuclear medicine.
AB - Background: Radiolabeled somatostatin analogues (e.g. [68Ga]Ga-DOTATATE and [177Lu]Lu-DOTATATE) have been used to diagnose, monitor, and treat neuroendocrine tumour (NET) patients with great success. [18F]AlF-NOTA-octreotide, a promising 18F-labeled somatostatin analogue and potential alternative for 68Ga-DOTA-peptides, is under clinical evaluation. However, ideally, the same precursor (combination of chelator-linker-vector) can be used for production of both diagnostic and therapeutic radiopharmaceuticals with very similar (e.g. Al18F-method in combination with therapeutic radiometals 213Bi/177Lu) or identical (e.g. complementary Tb-radionuclides) pharmacokinetic properties, allowing for accurate personalised dosimetry estimation and radionuclide therapy of NET patients. In this study we evaluated 3p-C-NETA, as potential theranostic Al18F-chelator and present first results of radiosynthesis and preclinical evaluation of [18F]AlF-3p-C-NETA-TATE. Methods: 3p-C-NETA was synthesized and radiolabeled with diagnostic (68Ga, Al18F) or therapeutic (177Lu, 161Tb, 213Bi, 225Ac and 67Cu) radionuclides at different temperatures (25-95 °C). The in vitro stability of the corresponding radiocomplexes was determined in phosphate-buffered saline (PBS) and human serum. 3p-C-NETA-TATE was synthesized using standard solid/liquid-phase peptide synthesis. [18F]AlF-3p-C-NETA-TATE was synthesized in an automated AllinOne® synthesis module and the in vitro stability of [18F]AlF-3p-C-NETA-TATE was evaluated in formulation buffer, PBS and human serum. [18F]AlF-3p-C-NETA-TATE pharmacokinetics were evaluated using µPET/MRI in healthy rats, with [18F]AlF-NOTA-Octreotide as benchmark. Results: 3p-C-NETA quantitatively sequestered 177Lu, 213Bi and 67Cu at 25 °C while heating was required to bind Al18F, 68Ga, 161Tb and 225Ac efficiently. The [18F]AlF-, [177Lu]Lu- and [161Tb]Tb-3p-C-NETA-complex showed excellent in vitro stability in both PBS and human serum over the study period. In contrast, [67Cu]Cu- and [225Ac]Ac-, [68Ga]Ga-3p-C-NETA were stable in PBS, but not in human serum. [18F]AlF-3p-C-NETA-TATE was obtained in good radiochemical yield and radiochemical purity. [18F]AlF-3p-C-NETA-TATE displayed good in vitro stability for 4 h in all tested conditions. Finally, [18F]AlF-3p-C-NETA-TATE showed excellent pharmacokinetic properties comparable with the results obtained for [18F]AlF-NOTA-Octreotide. Conclusions: 3p-C-NETA is a versatile chelator that can be used for both diagnostic applications (Al18F) and targeted radionuclide therapy (213Bi, 177Lu, 161Tb). It has the potential to be the new theranostic chelator of choice for clinical applications in nuclear medicine.
KW - 3p-C-NETA
KW - AlF
KW - PET
KW - Radiopharmaceutical
KW - Targeted radionuclide therapy
UR - http://www.scopus.com/inward/record.url?scp=85136837792&partnerID=8YFLogxK
U2 - 10.7150/thno.75336
DO - 10.7150/thno.75336
M3 - Article
C2 - 35966589
AN - SCOPUS:85136837792
SN - 1838-7640
VL - 12
SP - 5971
EP - 5985
JO - Theranostics
JF - Theranostics
IS - 13
ER -