高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (5): 801.

• 研究论文 • 上一篇    下一篇

潜在的新型肿瘤显像剂99mTc-MAG3-GGCNGRC的合成及生物分布

张弢, 王毅, 褚泰伟, 刘新起, 胡少文, 王祥云   

  1. 北京大学化学与分子工程学院应用化学系, 北京100871
  • 收稿日期:2004-09-13 出版日期:2005-05-10 发布日期:2005-05-10
  • 通讯作者: 刘新起(1946年出生),男,副教授,主要从事无机化学研究.E-mail:xqliu@pku.edu.cn E-mail:xqliu@pku.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20171005)资助.

Synthesis and Biodistribution of a Cyclic Peptide Containing NGR Motif as a Potential Tumor Angiogenesis Imaging Agent

ZHANG Tao, WANG Yi, CHU Tai-Wei, LIU Xin-Qi, HU Shao-Wen, WANG Xiang-Yun   

  1. Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2004-09-13 Online:2005-05-10 Published:2005-05-10

摘要: 为测评带有NGR基序的小分子多肽的99mTc配合物作为新型肿瘤显像剂的可能性,合成了带双功能螯合剂MAG3的环肽并进行了动物体内分布实验.直链短肽GGCNGRC环化为99mTc-MAG3-GGCNGRC,再与苯甲酰基保护的MAG3的N-羟基琥珀酰亚胺活泼酯偶联,生成Bz-MAG3-GGCNGRC.后者通过氧化-配体交换反应生成9mTc-MAG3-GGCNGRC,其放射化学纯度>90%,在血清和生理盐水中具有较好的稳定性.在正常小鼠和荷瘤裸鼠体内的生物分布表明,此类型小肽通过泌尿系统和肝胆系统代谢.荷直肠癌CL-187的裸鼠模型体内分布显示,注射后3h后,99mTc-MAG3-GGCNGRC,在肿瘤中有一定的特异性摄取,可能是由于NGR基序的亲新生血管所致.带有NGR基序的小分子多肽是一类很有发展潜力的新型肿瘤显像剂.

关键词: NGR, 肿瘤, 新生血管, MAG3, CD13

Abstract: In order to evaluate the potency of short peptides containing NGR motif as the imaging agents for diagnosis of tumor angiogenesis, a preliminary investigation on the synthesis and biodistrubution of a short peptide containing the NGR motif was carried out and the results are reported in the present paper. The open-chain peptide GGCNGRC was first cyclized to GG(CNGRC) by oxygen oxidation, and then coupled with benzoyl-protected N-hydroxysuccinimidyl-MAG3 to form Bz-MAG3-GG(CNGRC). The latter was labeled with 99mTc by reduction-ligand substitution procedure, while the benzoyl group was removed simultaneously. The labeled complex 99mTc-MAG3-GG(CNGRC) was isolated by HPLC and purified by reverse-phase sep-pak column. Its radiochemical purity was estimated to be better than 90%. The complex was stable in saline and serum. The biodistribution of 99mTc-MAG3-GG(CNGRC) in normal and tumor-bearing mice indicates that it is quickly distributed to the whole body and excreted via both hepatobiliary tract and kidney-urethra systems. 99mTc-MAG3-GG(CNGRC) was accumulated in zenografted colon carcinoma (CL-187) after 3 h post injection. It is expected that the radiolabeled short peptides containing NGR motif may be useful as diagnostic imaging agents for tumor angiogenesis.

Key words: NGR, Tumor, Angiogenesis, MAG3, CD13

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