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作 者:王慧春[1] 张政伟[1] 刘平[1] 薛方平[1] 谭海波[1] 左传涛[1] 华逢春[1] 黄喆慜[1] 赵军[1] 管一晖[1]
机构地区:[1]复旦大学附属华山医院PET中心,上海200235
出 处:《中华核医学杂志》2011年第1期46-49,共4页Chinese Journal of Nuclear Medicine
基 金:基金项目:国家重点基础研究发展(973)计划中医理论专项(2007CB5125022007CB512500)
摘 要:目的建立应用国产11C-模块自动化制备阿片受体PET显像剂11C-卡芬太尼(CFN)的方法,研究其在大鼠体内的生物学分布。方法11C-碘代甲烷(CH3I)在线转化为11C-三氟甲基磺酰甲烷(Triilate—CH,),后者通入装有0.5mg前体去甲基卡芬太尼(溶解于0.15ml二甲基亚砜溶液)的V型瓶内,在常温下对前体进行甲基化反应并完成11C-标记,使用Sep—PakC2柱纯化产物。正常SD大鼠尾静脉注入11C-CFN后5,15,30,45min处死,研究其体内生物学分布,以%ID/g表示。采用SPSS13.0软件,非正态分布资料各组间均数比较采用非参数检验。结果在线自动化制备11C-CFN合成时间约20min(加速器轰击结束,EOB),平均产率为(35.5±2.2)%(n=12,不校正),无需经HPLC纯化,放化纯〉98%。11C-CFN在大鼠体内吸收、分布迅速,主要通过肝、肾代谢,脑内放射性摄取高,注射后5min达峰值,以丘脑[(4.26±0.89)%ID/g]和纹状体[(4.05±1.08)%ID/g]的分布最为显著,其次分别为大脑皮质[(2.63±0.89)%ID/g]、脑干[(2.26±0.57)%ID/g]、海马[(2.17±0.55)%ID/g]和小脑[(2.15±0.39)%ID/g]。结论使用国产11C-模块自动化制备11C-CFN简便快速、产率稳定、放化纯高,可用于阿片受体PET显像研究。Objective To establish an automatic synthesis method for HC-carfentanil (CFN) as an novel opiate receptor radioligand and study its biodistribution in rats. Methods 11C-Triflate-CH3 was bubbled into 0.5 mg precursor desmethyl-CFN (which was dissolved in 0.15 ml DMSO) to generate 11C-CFN in a V-tube at room temperature. Sep-Pak C2 column was used for purification of 11C-CFN, which was eluted by 3ml binary system aqueous solution, 10 ml water thrice, and then 1 ml ethanol. The biodistribution ( % ID/g) of 11C-CFN in SD rats was studied. SPSS 13.0 was used for statistical analysis. Non-normal distribution data were analyzed using nonparametric test. Results The synthesis time for 11 C-CFN was 20 min (end of bombardment, EOB). The synthesis yield was (35.5 ± 2.2) % on average (n = 12, uncorrected) with the radioehemieal purity over 98%. Biodistribution study in rats showed that the tracer had a high brain uptake, rapid blood clearance, and a metabolic pathway via liver and kidney. The highest tracer uptake was in thalamus ( 4.26 ± 0.89 ) % ID/g and striatum (4.05 ±1.08 ) % ID/g at 5 min after injection, followed by cerebral cortex (2.63 + 0.89) % ID/g, pons (2.26 ± 0. 57 ) % ID/g, hippocampus (2. 17 ± 0.55 ) % ID/g and cerebellum (2. 15 ±0.39) %ID/g. Conclusions The automatic synthesis of nC-CFN is fast and reliable, and this radioligand can be used for opiate receptor imaging.
分 类 号:R817[医药卫生—影像医学与核医学]
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