Cyclam with a phosphinate-bis(phosphonate) pendant arm is a bone-targeting carrier of copper radionuclides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10444999" target="_blank" >RIV/00216208:11310/22:10444999 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/22:00125995

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=7xSrPP4koH" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=7xSrPP4koH</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d2dt01172g" target="_blank" >10.1039/d2dt01172g</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cyclam with a phosphinate-bis(phosphonate) pendant arm is a bone-targeting carrier of copper radionuclides

Popis výsledku v původním jazyce

Ligands combining a bis(phosphonate) group with a macrocycle function as metal isotope carriers for radionuclide-based imaging and for treating bone metastases associated with several cancers. However, bis(phosphonate) pendant arms often slow down complex formation and decrease radiochemical yields. Nevertheless, their negative effect on complexation rates may be mitigated by using a suitable spacer between bis(phosphonate) and the macrocycle. To demonstrate the potential of bis(phosphonate) bearing macrocyclic ligands as a copper radioisotope carrier, we report the synthesis of a new cyclam derivative bearing a phosphinate-bis(phosphonate) pendant (H5te1P(BP)). The ligand showed a high selectivity to Cu(II) over Zn(II) and Ni(II) ions, and the bis(phosphonate) group was not coordinated in the Cu(II) complex, strongly interacting with other metal ions in solution. The Cu(II) complex formed quickly, in 1 s, at pH 5 and at a millimolar scale. The complexation rates significantly differed under a ligand or metal ion excess due to the formation of reaction intermediates differing in their metal-to-ligand ratio and protonation state, respectively. The Cu(II)-te1P(BP) complex also showed a high resistance to acid-assisted hydrolysis (t(1/2) 2.7 h; 1 M HClO4, 25 °C) and was effectively adsorbed on the hydroxyapatite surface. H5te1P(BP) radiolabeling with [(64)Cu]CuCl2 was fast and efficient, with specific activities of approximately 30 GBq (64)Cu per 1 μmol of ligand (pH 5.5, room temperature, 30 min). In a pilot experiment, we further demonstrated the excellent suitability of [(64)Cu]Cu(II)-te1P(BP) for imaging active bone compartments by dedicated small animal PET/CT in healthy mice and subsequently in a rat femoral defect model, in direct comparison with [(18)F]fluoride. Moreover, [(64)Cu]Cu(II)-te1P(BP) showed a higher uptake in critical bone defect regions. Therefore, our study highlights the potential of [(64)Cu]Cu(II)-te1P(BP) as a PET radiotracer for evaluating bone healing in preclinical and clinical settings with a diagnostic value similar to that of [(18)F]fluoride, albeit with a longer half-life (12.7 h) than (18)F (1.8 h), thereby enabling extended observation times.

Název v anglickém jazyce

Cyclam with a phosphinate-bis(phosphonate) pendant arm is a bone-targeting carrier of copper radionuclides

Popis výsledku anglicky

Ligands combining a bis(phosphonate) group with a macrocycle function as metal isotope carriers for radionuclide-based imaging and for treating bone metastases associated with several cancers. However, bis(phosphonate) pendant arms often slow down complex formation and decrease radiochemical yields. Nevertheless, their negative effect on complexation rates may be mitigated by using a suitable spacer between bis(phosphonate) and the macrocycle. To demonstrate the potential of bis(phosphonate) bearing macrocyclic ligands as a copper radioisotope carrier, we report the synthesis of a new cyclam derivative bearing a phosphinate-bis(phosphonate) pendant (H5te1P(BP)). The ligand showed a high selectivity to Cu(II) over Zn(II) and Ni(II) ions, and the bis(phosphonate) group was not coordinated in the Cu(II) complex, strongly interacting with other metal ions in solution. The Cu(II) complex formed quickly, in 1 s, at pH 5 and at a millimolar scale. The complexation rates significantly differed under a ligand or metal ion excess due to the formation of reaction intermediates differing in their metal-to-ligand ratio and protonation state, respectively. The Cu(II)-te1P(BP) complex also showed a high resistance to acid-assisted hydrolysis (t(1/2) 2.7 h; 1 M HClO4, 25 °C) and was effectively adsorbed on the hydroxyapatite surface. H5te1P(BP) radiolabeling with [(64)Cu]CuCl2 was fast and efficient, with specific activities of approximately 30 GBq (64)Cu per 1 μmol of ligand (pH 5.5, room temperature, 30 min). In a pilot experiment, we further demonstrated the excellent suitability of [(64)Cu]Cu(II)-te1P(BP) for imaging active bone compartments by dedicated small animal PET/CT in healthy mice and subsequently in a rat femoral defect model, in direct comparison with [(18)F]fluoride. Moreover, [(64)Cu]Cu(II)-te1P(BP) showed a higher uptake in critical bone defect regions. Therefore, our study highlights the potential of [(64)Cu]Cu(II)-te1P(BP) as a PET radiotracer for evaluating bone healing in preclinical and clinical settings with a diagnostic value similar to that of [(18)F]fluoride, albeit with a longer half-life (12.7 h) than (18)F (1.8 h), thereby enabling extended observation times.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Dalton Transactions

ISSN

1477-9226

e-ISSN

1477-9234

Svazek periodika

51

Číslo periodika v rámci svazku

24

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

9541-9555

Kód UT WoS článku

000807023900001

EID výsledku v databázi Scopus

2-s2.0-85131966310