Synthesis and evaluation of (S)-[(18)F]fesetron in the rat brain as a potential PET imaging agent for serotonin 5-HT3 receptors.

Synthesis and evaluation of (S)-[(18)F]fesetron in the rat brain as a potential PET imaging agent for serotonin 5-HT3 receptors.
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(S)-[(18)F]fesetron 在大鼠大脑中的合成和评估,作为血清素 5-HT3 受体的潜在 PET 成像剂。

DOI:
10.1016/j.bmcl.2016.03.018
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发表时间:
2016
影响因子:
2.7
通讯作者:
Mukherjee,Jogeshwar
Mukherjee,Jogeshwar
中科院分区:
医学4区
文献类型:
--
作者:
Pithia,NeemaK;Liang,Christopher;Pan,Xiang-Zuo;Pan,Min-Liang;Mukherjee,Jogeshwar

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5-羟色胺 5-HT3 受体参与多种脑功能,包括作为癌症化疗期间的呕吐目标。我们在此报告 (S)-2,3-二甲氧基-5-(3′-[18F]氟丙基)-N-(1-氮杂双环[2.2.2]辛-3-基)苯甲酰胺 ([18F]fesetron) 作为血清素 5-HT3 受体的潜在 PET 成像剂的开发。通过用氟-18放射性标记((S)-2,3-二甲氧基-5-(3'-甲苯磺酰氧基丙基)-N-(1-氮杂双环[2.2.2]辛-3-基)苯甲酰胺),获得(S)-[18F]fesetron,其衰变校正收率为5%至10%,在放射合成结束时比活性>74 GBq/μmol。大鼠的 PET 成像显示,[18F]fesetron 在大脑中的摄取量较低,而纹状体和小脑区域的结合保留。使用丘作为参考区域,纹状体的比率为 3.4,小脑的比率为 2.5。离体脑 PET 分析显示 [18F]fesetron 在海马、纹状体和小脑区域结合。小脑区域对应于已知含有 5-HT3 受体的后区和孤束核。背侧海马的摄取率最高,与丘的比率>17,而后区和纹状体的比率>10。因此,[18F]fesetron 对已知含有大量血清素 5-HT3 受体的大鼠大脑区域表现出独特的结合特征。然而,极低的大脑摄取限制了其作为 PET 放射性示踪剂在该动物模型中的用途。
Serotonin 5-HT3receptors are involved in various brain functions including as an emesis target during cancer chemotherapy. We report here the development of (S)-2,3-dimethoxy-5-(3′-[18F]fluoropropyl)-N-(1-azabicyclo[2.2.2]oct-3-yl)benzamide ([18F]fesetron) as a potential PET imaging agent for serotonin 5-HT3receptors. By radiolabeling((S)-2,3-dimethoxy-5-(3′-tosyloxypropyl)-N-(1-azabicyclo[2.2.2]oct-3-yl)benzamide) with fluorine-18, (S)-[18F]fesetron was obtained in 5 to 10% decay-corrected yields and with specific activities >74 GBq/μmol at the end of radiosynthesis. PET imaging in rats showed low uptake of [18F]fesetron in the brain with retention of binding in the striatal and cerebellar regions. Using colliculi as a reference region, ratios were 3.4 for striata and 2.5 for cerebellum. Ex vivo brain PET analysis displayed binding of [18F]fesetron in the hippocampus, striatum and cerebellar regions. Cerebellar regions corresponded to area postrema and nucleus tract solitaris known to contain 5-HT3receptors. Dorsal hippocampus showed the highest uptake with ratio of >17 with respect to colliculi, while area postrema and striata had ratios of >10. Thus, [18F]fesetron exhibited a unique binding profile to rat brain regions known to contain significant amounts of serotonin 5-HT3receptors. However, the very low brain uptake limits its usefulness as a PET radiotracer in this animal model.
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