有机基质对比剂用于磁共振成像
Andrzej Rajca1, Ying Wang, Michael Boska
1Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, United States.
Journal of the American Chemical Society
|September 15, 2012
概括
研究人员开发了一种可注射的有机激素对比剂 (ORCA),用于增强MRI. 这种无金属剂在小鼠中提供高放松性和持续信号增强,持续超过一个小时.
科学领域:
- 生物医学成像技术 生物医学成像技术
- 材料科学 材料科学 材料科学
- 有机化学 有机化学
背景情况:
- 磁共振成像 (MRI) 传统上依赖于磁性金属离子,这引发了潜在的毒性问题.
- 开发新的,无金属的对比剂对于更安全,更有效的诊断成像至关重要.
- 有机激进对比剂 (ORCA) 提供了一个有前途的替代品,因为它们的调节性质和潜在的低毒性.
研究的目的:
- 设计和合成一种新的,静脉注射的有机激素对比剂 (ORCA).
- 描述开发的ORCA用于磁共振成像 (MRI) 的放松性和体内性能.
- 评估这种无金属剂对长期选择性MRI增强的潜力.
主要方法:
- 分子设计包含螺旋环基氧化物激素和聚乙烯甘醇链.
- 功能化基的结合,以第四代聚烯胺树脂基架.
- 在试验室放松度测量和在小鼠体内MRI实验.
主要成果:
- 合成的ORCA显示了高分子 (1) H水的放松性 (r(1) 大约为5mM(-1) s(-1).
- 没有金属的ORCA具有很长的保质期,表明其稳定性很好.
- 在小鼠体内MRI显示,在注射后1小时以上,选择性增强信号.
结论:
- 一种基于树突分子结合的氧化物基的新型可注射ORCA已经成功开发出来.
- 该剂提供显著的放松性和长时间的信号增强,证明了其对先进的MRI应用的潜力.
- 这种无金属的方法代表了MRI对比剂领域的一个有前途的进步.
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