Radiosynthesis and in vivo evaluation of 11C-labeled BMS-193885 and its desmethyl analog as PET tracers for neuropeptide Y1 receptors View Full Text


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Article Info

DATE

2019-12

AUTHORS

Kazunori Kawamura, Wakana Mori, Masayuki Fujinaga, Tomoteru Yamasaki, Yiding Zhang, Hidekatsu Wakizaka, Akiko Hatori, Lin Xie, Katsushi Kumata, Takayuki Ohkubo, Yusuke Kurihara, Masanao Ogawa, Nobuki Nengaki, Ming-Rong Zhang

ABSTRACT

Neuropeptide Y (NPY) has been implicated in a wide variety of physiological processes, including feeding, learning, memory, emotion, cardiovascular homeostasis, hormone secretion, and circadian rhythms. NPY Yl receptor (NPY Y1-R) is the most widely studied NPY receptor, and is involved in many of these processes. BMS-193885 (1) was previously developed as a potent and selective NPY Y1-R antagonist, which has good systemic bioavailability and brain penetration. To evaluate the characteristics of 1 in vivo, we developed 11C-labeled BMS-193885 ([11C]1) and its desmethyl analog ([11C]2) for potential use as two new positron emission tomography (PET) tracers. [11C]1 was synthesized from [11C]methyl iodide using 2. [11C]2 was synthesized from [11C]phosgene using its aniline and amine derivatives. The mean ± S.D. decay-corrected radiochemical yields of [11C]1 and [11C]2 from 11CO2 at the end of radionuclide production were 23 ± 3.2% (n = 6) and 24 ± 1.5% (n = 4), respectively. In biodistribution on mice, radioactivity levels for both tracers were relatively high in the kidney, small intestine, and liver at 60 min post-injection. The radioactivity levels in the kidney, lung, and spleen of mice at 30 min post-injection with [11C]1 were significantly reduced by pretreatment with 1 (10 mg/kg), and levels of [11C]1 in the brain of mice were significantly increased by pretreatment with the P-glycoprotein and breast cancer resistance protein inhibitor elacridar (10 mg/kg). In metabolite analysis using mouse plasma, [11C]1 and [11C]2 were rapidly metabolized within 30 min post-injection, and [11C]1 was mainly metabolized into unlabeled 2 and radiolabeled components. [11C]1 and [11C]2 were successfully synthesized with sufficient amount of radioactivity and high quality for use in vivo. Our study of [11C]1 and its desmethyl analog [11C]2 was useful in that it helped to elucidate the in vivo characteristics of 1. More... »

PAGES

4

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s41181-019-0056-5

DOI

http://dx.doi.org/10.1186/s41181-019-0056-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112217073


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