A Novel Way To Radiolabel Human Butyrylcholinesterase for Positron Emission Tomography through Irreversible Transfer of the Radiolabeled Moiety

A Novel Way To Radiolabel Human Butyrylcholinesterase for Positron Emission Tomography through Irreversible Transfer of the Radiolabeled Moiety
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通过放射性标记部分的不可逆转移来放射性标记人丁酰胆碱酯酶用于正电子发射断层扫描的新方法

DOI:
10.1002/cmdc.201600223
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发表时间:
2016
期刊:
影响因子:
3.4
通讯作者:
M. Decker
M. Decker
中科院分区:
医学4区
文献类型:
--
作者:
E. Sawatzky;E. Al-Momani;R. Kobayashi;S. Samnick;T. Higuchi;M. Decker

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已知丁酰胆碱酯酶(BChE)参与血浆中外源性物质的解毒,并且与神经退行性疾病、2型糖尿病、肥胖症和心血管系统疾病的进展相关。 在本研究中,我们开发了基于氨基甲酸酯的抑制剂作为正电子发射断层扫描(PET)放射性示踪剂,18F和11C作为放射性同位素,以可视化BChE分布。这些抑制剂在氨基甲酸酯位点被放射性标记,并将该部分转移到BChE上,从而导致该酶的共价和永久放射性标记。迄今为止,尚无类似的胆碱酯酶放射性示踪剂。通过离体小鼠脑切片放射自显影实验和动力学研究,证明了放射性标记的氨基甲酸酯部分选择性和共价转移到BChE上。 这些示踪剂可能提供高分辨率的BChE在体内的分布,使调查与BChE发生的改变相关的疾病的病理生理机制。 
The enzyme butyrylcholinesterase (BChE) is known to be involved in the detoxification of xenobiotics in blood plasma and is associated with the progress of neurodegenerative disorders, diabetes type 2, obesity, and diseases of the cardiovascular system. In the present study, we developed carbamate‐based inhibitors serving as positron emission tomography (PET) radiotracers with18F and11C as radioisotopes to visualize BChE distribution. These inhibitors are radiolabeled at the carbamate site and transfer this moiety onto BChE, which thus results in covalent and permanent radiolabeling of the enzyme. There are no comparable radiotracers for cholinesterases described to date. By ex vivo autoradiography experiments on mice brain slices and kinetic investigations, selective and covalent transfer of the radiolabeled carbamate moiety onto BChE was proven. These tracers might provide high resolution of BChE distribution in vivo to enable investigations into the pathophysiological mechanisms of diseases associated with alterations in BChE occurrence.
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