18F—FP—peptide用于化疗后肿瘤细胞凋亡显像  被引量:7

Imaging of apoptosis with 18 F.FP-peptide focused on the evaluation of tumor response to chemother-apy

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作  者:张宝石[1] 周乃康[2] 王卉[3] 张晓军[3] 孙志军[3] 田嘉禾[3] 张锦明[3] 

机构地区:[1]解放军总医院第一附属医院胸心外科,北京100048 [2]解放军总医院胸外科 [3]解放军总医院核医学科

出  处:《中华核医学与分子影像杂志》2012年第2期84-89,共6页Chinese Journal of Nuclear Medicine and Molecular Imaging

基  金:国家自然科学基金(81071170,81771400);北京市自然科学基金(7122162)

摘  要:目的研发含天冬氨酸一谷氨酸-缬氨酸一天冬氨酸(DEVD)核心的正电子核素标记的easpase一3多肽活性显像剂,以在体检测肿瘤细胞凋亡。方法用国产合成模块通过点击化学合成(18S,21S,24S,27S,30S)-27一(2一羧乙基)-21一(羧甲基)一30一((2S,3R,4R,5R,6S)-6一((2-(4一(3一[”F]氟戊基).1H-1,2,3三唑.1.y1)乙酰氨基)甲基)-3,4,5-三羟基四氢-2H-吡喃一2一羧酰氨)-24一异丙基-18·甲基一17,20,23,26,29一五羰基4,7,10,13一四氧一16,19,22,25,28一五氨杂三十烷一1,32一二酸(“F—FP—peptide)。在体外”F—FP.peptide与经卡铂化疗的A549肺癌细胞混合60rain后,检测细胞放射性摄取率,摄取率=(放射性活度平均值X10X100%)/(细胞计数×细胞体积×放射性对照值)。将”F—FP—peptide注射到经卡铂化疗的荷A549肿瘤小鼠体内,60rain后测其生物学分布,并行microPET/cT显像。应用流式细胞仪检测细胞凋亡率,评价”F—FP—peptide放射性摄取率与细胞凋亡率的相关性。数据处理使用SPSS13.0统计软件,计量资料采用牙±s表示,组间比较采用单因素方差分析,相关性研究采用线性相关与回归分析。结果”F—FP—peptide的合成效率为(21.0±4.5)%(n=6,不校正),放化纯为99%,比活度为870GBq/txmol。体外细胞实验研究表明,各组细胞凋亡率随卡铂化疗时间延长逐渐升高,经卡铂处理后0、1、2和24h后细胞凋亡率分别为(1.02±0.31)%、(4.85±1.26)%、(6.37±2.21)%和(10.23±2.43)%,对应的细胞摄取率分别为(0.06±0.01)%、(0.31±0.04)%、(0.44±0.02)%和(0.86±0.04)%,各组细胞凋亡率与放射性摄取率之间呈明显正相关(y=1.1244+11.0949x,r=0.9850,P〈0.01);荷A549肿瘤卡铂化疗后24h,肿瘤组织放射�Objective To investigate the feasibility of a PET radionuclide, caspase-3-activatable probe containing Asp-Glu-Val-Asp (DEVD), for imaging evaluation of tumor apoptosis in vivo. Methods( 18 S, 21 S, 24 S, 27 S, 30 S ) -27- ( 2 -carboxyethyl ) -21 - ( carboxymethyl ) -30 - ( ( 2 S, 3 R, 4 R, 5 R, 6 S ) -6 - ( ( 2 - ( 4 - ( 3- [18 F ] fluoropropyl ) - 1 H- 1,2,3-triazol- 1 -yl ) acetamido ) methyl ) -3,4,5 -trihydroxytetrahydro-2H-py- ran-2 - carboxamido ) -24 -isopropyl- 18 -methyl- 17,20,23,26,29 -pentaoxo-4,7,1 O, 13 -tetraoxa- 16,19,22,25, 28-pentaazadotriacontane-1,32-dioic acid (lSF-FP-peptide) was automatically synthesized using a domestie synthesis module by "click chemistry". In vitro cellular uptake of ISF-FP-peptide was evaluated by mixing the peptide with lung adenocarcinoma A549 cells after chemotherapy by earboplatin. Apopto^is was monitored by flow cytometry. The correlation between cellular uptake and the apoptotic ratio was analyzed. In vivo bio- distribution and micro PET imaging were performed on A549 tumor bearing mice with or without chemothera- py. SPSS 13.0 was used for statistical analysis. Comparison among groups was conducted by one-way analy- sis of variance, and correlation was analyzed by linear correlation and regression. Results The yield of ~s F-FP-peptide was (21.0 + 4.5 ) % ( n = 6, end of synthesis (EOS) ). The radioehemistry purity was over 99% and the specific activity was 870 GBq/p^nol. After the in vitro treatment of A549 cells, the apoptotie ratio was (1.02 +0.31)%, (4.85 ~ 1.26)%, (6.37 +2.21)% and (10.23 +2.43)% at 0, 1, 2 and 24 h, respectively. The corresponding cellular uptake of lSF-FP-peptide was (0. 06 -+0. 01 )%, (0. 31 + 0. 04)%, (0.44 +0. 02)% and (0.86 ~0.04)%. Significant positive correlation was found between the apoptosis ratio and cellular uptake of is F-FP-peptide (y = 1. 1244 + 11. 0949x, r = 0. 9850, P 〈 0. 01 ). The tumor uptake of A549 bearing

关 键 词:肽类 同位素标记 氟放射性同位素 化学合成 体层摄影术 发射型计算机 肿瘤细胞 培养的 凋亡 小鼠 

分 类 号:R817.4[医药卫生—影像医学与核医学]

 

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