Synthesis and evaluation of [11C]RU40555, a selective glucocorticoid receptor antagonist
作者:Takahiro Matsuya、Hiroyuki Takamatsu、Yoshihiro Murakami、Akihiro Noda、Kazuhiko Osoda、Rikiya Ichise、Yuji Awaga、Shintaro Nishimura
DOI:10.1002/jlcr.958
日期:2005.8
We demonstrated the synthesis of carbon-11 labeled 17-α-hydroxy-11-β-/4-/[methyl]-[1-methylethyl]-aminophenyl/-17α-[prop-1-ynyl]esta-4-9-diene-3-one (RU40555), a selective glucocorticoid receptor (GR) antagonist, and examined the in vivo profile of [11C]RU40555. [11C]RU40555 was synthesized by direct N-methylation with [11C]CH3OTf at 60°C for 5 min and an injectable solution of [11C]RU40555 was obtained in 31 min at the end of bombardment. The decay-corrected radiochemical yield was 19%, the specific radioactivity was 57.5±14.0 GBq/µmol, and the radiochemical purity was more than 99% as determined by HPLC. In rat experiments, the effects of adrenalectomy (ADX) on brain accumulation of [11C]RU40555 were examined. ADX significantly decreased plasma corticosterone levels, and significantly increased brain accumulation of [11C]RU40555. We succeeded in developing a rapid automated synthesis method for [11C]RU40555, a GR antagonist, and showed [11C]RU40555 had a potential as a PET tracer for mapping GR. Copyright © 2005 John Wiley & Sons, Ltd.
我们展示了碳-11标记的17-α-羟基-11-β-/4-/[甲基]-[1-甲基乙基]-氨基苯基/-17α-[丙-1-炔基]酯-4-9-二烯-3-酮(RU40555)这一特定糖皮质激素受体(GR)拮抗剂的合成,并检查了[11C]RU40555的体内特性。[11C]RU40555通过在60°C下用[11C]CH3OTf直接进行N-甲基化合成,合成时间为5分钟,并在轰击结束后31分钟获得可注射的[11C]RU40555溶液。经衰变校正后的放射化学产率为19%,比放射活度为57.5±14.0 GBq/µmol,放射化学纯度通过高效液相色谱法(HPLC)测定超过99%。在大鼠实验中,我们研究了肾上腺切除术(ADX)对[11C]RU40555在脑中的积累的影响。ADX显著降低了血浆皮质酮水平,并显著增加了[11C]RU40555在脑中的积累。我们成功开发了一种快速的自动合成方法来合成GR拮抗剂[11C]RU40555,并显示[11C]RU40555作为PET示踪剂用于映射GR具有潜力。版权所有 © 2005 John Wiley & Sons, Ltd.