Synthesis and Biological Evaluation of (<i>S</i>)-Amino-2-methyl-4-[<sup>76</sup>Br]bromo-3-(<i>E</i>)-butenoic Acid (BrVAIB) for Brain Tumor Imaging
作者:Jennifer L. Bartels、Chaofeng Huang、Aixiao Li、Liya Yuan、Keith Rich、Jonathan McConathy、Suzanne E. Lapi
DOI:10.1021/acs.jmedchem.5b01035
日期:2015.11.12
The novel compound, (S)-amino-2-methyl-4-[Br-76]-bromo-3-(E)-butenoic acid (BrVAIB, [Br-76]5), was characterized against the known system A tracer, IVAIB ( [I-123]8). [Br-76]5 was prepared in a 51% +/- 19% radiochemical yield with high radiochemical purity (>= 98%). The biological properties of [Br-76]5 were compared with those of [I-123]8. Results showed that [Br-76]5 undergoes mixed amino acid transport by system A and system L transport, while [I-123]8 had less uptake by system L. [Br-76]5 demonstrated higher uptake than [I-123]8 in DBT tumors 1 h after injection (3.7 +/- 0.4% ID/g vs 1.5 +/- 0.3% ID/g) and also showed higher uptake vs [I-123]8 in normal brain. Small animal PET studies with [Br-76]5 demonstrated good tumor visualization of intracranial DBTs up to 24 h with clearance from normal tissues. These results indicate that [Br-76]5 is a promising PET tracer for brain tumor imaging and lead compound for a mixed system A and system L transport substrate.
Facile Stereospecific Synthesis and Biological Evaluation of (<i>S</i>)- and (<i>R</i>)-2-Amino-2-methyl-4-[<sup>123</sup>I]iodo-3-(<i>E</i>)-butenoic Acid for Brain Tumor Imaging with Single Photon Emission Computerized Tomography
作者:Weiping Yu、Jonathan McConathy、Jeffrey Olson、Vernon M. Camp、Mark M. Goodman
DOI:10.1021/jm070476u
日期:2007.12.27
5) were radioiodoinated in 65-72% yield. (S)-IVAIB entered 9L gliosarcoma cells primarily via A-type transport in vitro with higher uptake than (R)-IVAIB. Biodistribution studies in rats with 9L gliosarcoma brain tumors demonstrated higher tumor to brain ratios with (S)-IVAIB (75:1 at 1 h) than (R)-IVAIB (7.7:1). In this model, (S)-IVAIB is superior to (R)-IVAIB and is a promising radiotracer for brain