Radioiodinated benzodiazepines: agents for mapping glial tumors
摘要:
Two isomeric iodinated analogues of the peripheral benzodiazepine binding site (PBS) ligand Ro5-4864 have been synthesized and labeled in high specific activity with iodine-125. Competitive binding assays conducted with the unlabeled analogues indicate high affinity for PBS. Tissue biodistribution studies in rats with these 125I-labeled ligands indicate high uptake of radioactivity in the adrenals, heart, and kidney--tissues known to have high concentrations of PBS. Preadministration of the potent PBS antagonist PK 11195 blocked in vivo uptake in adrenal tissue by over 75%, but to a lesser degree in other normal tissues. In vivo binding autoradiography in brain conducted in C6 glioma bearing rats showed dense, PBS-mediated accumulation of radioactivity in the tumor. Ligand 6 labeled with 123I may have potential for scintigraphic localization of intracranial glioma.
Radioiodinated benzodiazepines: agents for mapping glial tumors
摘要:
Two isomeric iodinated analogues of the peripheral benzodiazepine binding site (PBS) ligand Ro5-4864 have been synthesized and labeled in high specific activity with iodine-125. Competitive binding assays conducted with the unlabeled analogues indicate high affinity for PBS. Tissue biodistribution studies in rats with these 125I-labeled ligands indicate high uptake of radioactivity in the adrenals, heart, and kidney--tissues known to have high concentrations of PBS. Preadministration of the potent PBS antagonist PK 11195 blocked in vivo uptake in adrenal tissue by over 75%, but to a lesser degree in other normal tissues. In vivo binding autoradiography in brain conducted in C6 glioma bearing rats showed dense, PBS-mediated accumulation of radioactivity in the tumor. Ligand 6 labeled with 123I may have potential for scintigraphic localization of intracranial glioma.
VAN, DORT MARCIAN E.;CILIAX, BRIAN J.;GILDERSLEEVE, DAVID L.;SHERMAN, PHI+, J. MED. CHEM., 31,(1988) N 11, C. 2081-2086
作者:VAN, DORT MARCIAN E.、CILIAX, BRIAN J.、GILDERSLEEVE, DAVID L.、SHERMAN, PHI+
DOI:——
日期:——
Radioiodinated benzodiazepines: agents for mapping glial tumors
作者:Marcian E. Van Dort、Brian J. Ciliax、David L. Gildersleeve、Philip S. Sherman、Karen C. Rosenspire、Anne B. Young、Larry Junck、Donald M. Wieland
DOI:10.1021/jm00119a005
日期:1988.11
Two isomeric iodinated analogues of the peripheral benzodiazepine binding site (PBS) ligand Ro5-4864 have been synthesized and labeled in high specific activity with iodine-125. Competitive binding assays conducted with the unlabeled analogues indicate high affinity for PBS. Tissue biodistribution studies in rats with these 125I-labeled ligands indicate high uptake of radioactivity in the adrenals, heart, and kidney--tissues known to have high concentrations of PBS. Preadministration of the potent PBS antagonist PK 11195 blocked in vivo uptake in adrenal tissue by over 75%, but to a lesser degree in other normal tissues. In vivo binding autoradiography in brain conducted in C6 glioma bearing rats showed dense, PBS-mediated accumulation of radioactivity in the tumor. Ligand 6 labeled with 123I may have potential for scintigraphic localization of intracranial glioma.