Bisphosphonate sequestering agents. Synthesis and preliminary evaluation for in vitro and in vivo uranium(VI) chelation
摘要:
A library of bisphosphonate-based ligands was prepared using solution-phase parallel synthesis and tested for its uranium-binding properties. With the help of a screening method, based on a chromophoric complex displacement procedure, 23 dipodal and tripodal chelates bearing bisphosphonate chelating functions were found to display very high affinity for the uranyl ion and were selected for evaluation of their in vivo uranyl-removal efficacy. Among them, 11 ligands induced a huge modification of the uranyl biodistribution by deviating the metal from kidney and bones to liver. Among the other ligands, the most potent was the dipodal bisphosphonate 3C which reduced the retention of uranyl and increased its excretion by around 10% of the injected metal. (C) 2008 Elsevier Masson SAS. All rights reserved.
Design and Synthesis of C3-Symmetric LewisX Antigen
摘要:
[GRAPHICS]C-3-Symmetric glycoconjugates carrying three equivalent Lewis(x) antigens or beta-lactosides were synthesized from p-nitrophenyl glycosides and trimesic acid via regio- and stereocontrolled glycosylation reactions. An H-1 NMR study has shown that the C-3-symmetric glycoconjugates soluble in water provide useful probes to investigate the Ca2+-dependent Lewis(x)-Lewis(x) association.
A library of bisphosphonate-based ligands was prepared using solution-phase parallel synthesis and tested for its uranium-binding properties. With the help of a screening method, based on a chromophoric complex displacement procedure, 23 dipodal and tripodal chelates bearing bisphosphonate chelating functions were found to display very high affinity for the uranyl ion and were selected for evaluation of their in vivo uranyl-removal efficacy. Among them, 11 ligands induced a huge modification of the uranyl biodistribution by deviating the metal from kidney and bones to liver. Among the other ligands, the most potent was the dipodal bisphosphonate 3C which reduced the retention of uranyl and increased its excretion by around 10% of the injected metal. (C) 2008 Elsevier Masson SAS. All rights reserved.
Design and Synthesis of <i>C</i><sub>3</sub>-Symmetric Lewis<sup>X</sup> Antigen
[GRAPHICS]C-3-Symmetric glycoconjugates carrying three equivalent Lewis(x) antigens or beta-lactosides were synthesized from p-nitrophenyl glycosides and trimesic acid via regio- and stereocontrolled glycosylation reactions. An H-1 NMR study has shown that the C-3-symmetric glycoconjugates soluble in water provide useful probes to investigate the Ca2+-dependent Lewis(x)-Lewis(x) association.