Biological and Pharmaceutical Bulletin p. 1570 - 1573 (2003)
Update date:2022-07-31
Topics:
Fuchigami, Takeshi
Haradahira, Terushi
Arai, Takuya
Okauchi, Takashi
Maeda, Jun
Suzuki, Kazutoshi
Yamamoto, Fumihiko
Suhara, Tetsuya
Sasaki, Shigeki
Maeda, Minoru
NPS 1506 [3-fluoro-γ-(3-fluorophenyl)-N-methylbenzenepropamine] is representative of a non-psychotomimetic class of N-methyl-D-aspartate (NMDA) receptor antagonists. [11C]NPS 1506 was prepared at high radiochemical purity (γ98%) with a specific activity of around 50 GBq/μmmol at the end of synthesis by methylation of the desmethyl precursor with [11C]methyl iodide in the presence of NaH. Biodistribution of [11C]NPS 1506 in mice and rat demonstrated that uptake into the brain was rapid and occurred at high levels. [11C]NPS 1506 showed no appreciable specific binding in rodent brains under in vivo conditions, possibly because of both a large non-specific bound fraction and low in vitro binding affinity for NMDA receptors.
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