不同电荷肿瘤乏氧显像剂的合成及生物分布  

Preparation and Biodistribution of Tumor Hypoxia Imaging Agents With Different Charges

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作  者:黄士堂[1] 王祥云[1] 褚泰伟[1] 

机构地区:[1]北京大学,化学与分子工程学院,放射化学与辐射化学重点学科实验室,北京分子科学国家实验室,北京100871

出  处:《核化学与放射化学》2012年第1期27-33,共7页Journal of Nuclear and Radiochemistry

基  金:国家自然科学基金资助项目(20771011,21071010,91026011)

摘  要:电荷是药物分子的重要性质,可以影响其在体内的生物学行为。为了研究不同电性质的肿瘤乏氧显像剂在体内的生物分布行为,合成了3种带有不同电荷的肿瘤乏氧显像剂(S)-3-(4-羟基苯基)-2-(3-(2-硝基咪唑基)丙酰胺基)丙酸甲酯(NI-Y-M)、(S)-3-(4-羟基苯基)-2-(3-(2-硝基咪唑基)丙酰胺基)丙酸(NI-Y)和(S)-N-(3-胺丙基)-3-(4-羟基苯基)-2-(3-(2-硝基咪唑基)丙酰胺基)丙酰胺(NI-Y-A),并进行了131I标记。3种化合物的标记率均大于95%,体外稳定性好。纸上电泳结果表明,在生理条件下,[131I]NI-Y-M为中性分子,[131I]NI-Y和[131I]NI-Y-A则分别呈现负电和正电的电性质。从荷S180肉瘤小鼠体内分布结果发现:3种标记物在肿瘤组织呈现出快摄取慢清除的趋势,并且在肿瘤中的放射性活度明显高于肌肉和心、脑、脾等组织;随着时间的延长,肿瘤的相对摄取率提高;4h时,动物肿瘤与肌肉、肿瘤与血液放射性摄取的比值数据显示,带正电荷的标记物[131I]NI-Y-A是最优的肿瘤乏氧显像剂。The charge is an important characteristic of a drug molecule. The overall charge on a drug affects its pharmacological properties in vivo. In this study, (S)-methyl 3-(4- hydroxyphenyl) -2- ( 3- ( 2-nitro-1 H-imidazol-l-yl) propanamido) propanoate (NI-Y-M), ( S)-3- (4-hydroxyphenyl) -2- ( 3- ( 2-nitro-1 H-imidazol-1-yl ) propanamido) propanoic acid (NI-Y) and (S) -N-( 3-aminopropyl ) -3- ( 4-hydroxyphenyl )-2-( 3-( 2-nitro-1 H-imidazol-l-yl ) propanamido ) propanamide (NI-Y-A) were synthesized and radioiodinated with ^131 I. All the radioiodinated compounds are obtained in 〉95 % yield determined by HPLC and stable at room temperature for 24 h in vitro. The paper electrophoresis results indicate that the compounds formed are different in charge, [^1311]NI-Y-M, [^131 I]NI-Y, and [^1311] NI-Y-A are neutral, negative andpositive, respectively. The biodistribution results in mice bearing S180 tumor demonstrate that all of the [^131 I]NI-Y-M, [^131 I]NI-Y and [^131 I]NI-Y-A accumulate in tumor fast and slowly clear from it. The uptakes in tumor are higher than those in muscle, heart, brain and spleen. The tumor-to-tissue ratios increase along with time. At 4 h post injection, the up- take ratios of tumor-to-muscle and tumor-to-blood indicate that among them the positively charged [^1311]NI-Y-A is the best hypoxia agent.

关 键 词:乏氧显像剂 2-硝基咪唑 131I标记 电荷 生物分布 

分 类 号:R817.4[医药卫生—影像医学与核医学]

 

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