Comparative evaluation of Bis(thiosemicarbazone)- Biotin and Met-ac-TE3A for tumor imaging
摘要:
2,2',2 ''-(11-(2-((4-mercapto-1-methoxy-1-oxobutan-2-yl)amino)-2-oxoethyl)-1,4,8,11-tetraaza cyclotetradecane-1,4,8-triyl)triacetic acid, Met-ac-TE3A and (E)-N-methyl-24(E)-3-(2-(2-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoyphydrazinecarbono-thioyl)hydrazonobutan-2-yl-idene)hydrazinecarbothioamide, Bis(thiosemicarbazone)- Biotin were synthesized and evaluated for imaging application. The pharmacokinetics of these ligands were determined by tracer methods. In vitro human serum stability of Tc-99m Met-ac-TE3A/Tc-99m Bis(thiosemicarbazone)-Biotin after 24h was found to be 96.5% and 97.0% respectively. Blood kinetics of both ligands in normal rabbits showed biphasic clearance pattern. Ex vivo biodistribution study revealed significant initial tumor uptake and high tumor/muscles ratio which is a pre-requisite condition for a ligand to work as SPECT-radiopharmaceutical for tumor imaging. (C) 2015 Elsevier B.V. All rights reserved.
A metal complex of formula (III) wherein: M is a transition metal and A1, A2, X, X′, Y, L1′, R1′ and R2′ are as defined herein, is useful in medical imaging and therapy.