We have located links that may give you full text access.
Synthesis and evaluation of 99m Tc/Re-tricarbonyl complexes of the triphenylphosphonium cation for mitochondrial targeting.
Nuclear Medicine and Biology 2018 Februrary
INTRODUCTION: Lipophilic delocalized cations accumulate in tumor cell mitochondria due to their higher transmembrane potential. In this work, this strategy was adopted for the development of99m Tc tumor-targeted imaging agents.
METHODS: Two tridentate ligands containing the triphenylphosphonium cation, L1 (S-cysteinyl) and L2 (N-iminodiacetate) as well as the respective99m Tc/ReL1 and99m Tc/ReL2 tricarbonyl complexes were synthesized. The effect of the ligands and the Re complexes on cell growth in U-87 MG glioblastoma cells was assessed. In vitro stability studies and measurement of logP of the99m Tc tracers was performed. The cellular and mitochondrial uptake of the99m Tc tracers in U-87 MG cells was evaluated. Biodistribution of99m TcL1 and99m TcL2 were performed on SCID mice bearing U-87 MG tumors.
RESULTS: The ligands L1, L2 and the Re1 and ReL2 complexes were characterized spectroscopically. Single products99m TcL1 and99m TcL2, >90% stable in rat serum, were obtained. LogP was 0.40±0.14 for99m TcL1 and -0.02±0.07 for99m TcL2. L1, ReL1 and ReL2 caused no notable cytotoxicity and L2 was found to infer 40% inhibition of cellular growth at 10-5 M as well as 80% cell death in culture at 10-4 M. The cell uptake of99m TcL1 and99m TcL2 over 4h was 1.26±0.08% and 0.06±0.01% respectively, of which 13.41±3.63% and 18.61±6.19% was distributed in the mitochondria respectively. The initial tumor uptake in mice was found to be >1% ID/g for both99m Tc tracers.
CONCLUSIONS: In vitro mitochondrial and in vivo tumor targeting was observed, better in99m TcL1, however these properties should be optimized in future studies. Advances in Knowledge and Implications for Patient Care: Continuous efforts in this direction may lead to a suitable mitochondrial-targeted99m Tc imaging agent for tumor detection.
METHODS: Two tridentate ligands containing the triphenylphosphonium cation, L1 (S-cysteinyl) and L2 (N-iminodiacetate) as well as the respective99m Tc/ReL1 and99m Tc/ReL2 tricarbonyl complexes were synthesized. The effect of the ligands and the Re complexes on cell growth in U-87 MG glioblastoma cells was assessed. In vitro stability studies and measurement of logP of the99m Tc tracers was performed. The cellular and mitochondrial uptake of the99m Tc tracers in U-87 MG cells was evaluated. Biodistribution of99m TcL1 and99m TcL2 were performed on SCID mice bearing U-87 MG tumors.
RESULTS: The ligands L1, L2 and the Re1 and ReL2 complexes were characterized spectroscopically. Single products99m TcL1 and99m TcL2, >90% stable in rat serum, were obtained. LogP was 0.40±0.14 for99m TcL1 and -0.02±0.07 for99m TcL2. L1, ReL1 and ReL2 caused no notable cytotoxicity and L2 was found to infer 40% inhibition of cellular growth at 10-5 M as well as 80% cell death in culture at 10-4 M. The cell uptake of99m TcL1 and99m TcL2 over 4h was 1.26±0.08% and 0.06±0.01% respectively, of which 13.41±3.63% and 18.61±6.19% was distributed in the mitochondria respectively. The initial tumor uptake in mice was found to be >1% ID/g for both99m Tc tracers.
CONCLUSIONS: In vitro mitochondrial and in vivo tumor targeting was observed, better in99m TcL1, however these properties should be optimized in future studies. Advances in Knowledge and Implications for Patient Care: Continuous efforts in this direction may lead to a suitable mitochondrial-targeted99m Tc imaging agent for tumor detection.
Full text links
Related Resources
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app