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Coordination-Mediated Synthesis of Purification-Free Bivalent 99mTc-Labeled Probes for in Vivo Imaging of Saturable System
- Source :
- Bioconjugate Chemistry. 29:459-466
- Publication Year :
- 2018
- Publisher :
- American Chemical Society (ACS), 2018.
-
Abstract
- In the synthesis of technetium-99m (99mTc) labeled target-specific ligands, the presence of a large excess of unlabeled ligands over 99mTc in the injectate hinders target accumulation of 99mTc-labeled ligands by competing for target molecules. To circumvent the problem, we recently developed a concept of the metal coordination-mediated multivalency, and proved the concept with a 99mTc-labeled trivalent compound [99mTc(CO)3(CN-RGD)3]+ In this study, D-penicillamine (Pen) was selected as a chelating molecule and a cyclic RGDfK peptide was conjugated to Pen via a hexanoic linkage (Pen-Ahx-c(RGDfK)). 99mTc complexation reaction, and the stability, integrin αvβ3 binding affinity and biodistribution of the 99mTc-labeled probe was investigated to evaluate the applicability of the concept to bivalent probes. 99mTc-[Pen-Ahx-c(RGDfK)2] was obtained over 95% radiochemical yields under low Pen-Ahx-c(RGDfK) concentration (50 µM). 99mTc-[Pen-Ahx-c(RGDfK)2] showed approximately 10-times higher integrin αvβ3 binding affi...
- Subjects :
- Pharmacology
chemistry.chemical_classification
Biodistribution
biology
010405 organic chemistry
Chemistry
Organic Chemistry
Integrin
Biomedical Engineering
Pharmaceutical Science
Bioengineering
Peptide
Conjugated system
010402 general chemistry
01 natural sciences
Combinatorial chemistry
0104 chemical sciences
Metal
visual_art
visual_art.visual_art_medium
biology.protein
Molecule
Chelation
Preclinical imaging
Biotechnology
Subjects
Details
- ISSN :
- 15204812 and 10431802
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Bioconjugate Chemistry
- Accession number :
- edsair.doi...........46846c557c0dfa89353429dd723d5391