通过极地群介导的第二层水分子排序,增强GdDOTA-单胺复合物的放松性
Namini N Paranawithana1, Remy Chiaffarelli2,3,4, Jan Kretschmer2,3,4
1Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States.
Inorganic chemistry
|February 22, 2024
概括
加多DOTA-1AmP分子,一种潜在的MRI对比剂,表现出与其酸盐组相关的pH依赖性放松性. 虽然它的生物分布是有利的,但它的pH敏感性在常见的小型动物成像磁场下降.
科学领域:
- 生物医学成像技术 生物医学成像技术
- 磁共振成像 (MRI) 是一种磁共振成像技术.
- 对比剂开发对比剂开发
背景情况:
- 基于加多的对比剂 (GBCA) 对MRI至关重要.
- 开发具有pH响应的GBCA可以实现定量组织pH成像.
- 了解分子结构和放松性之间的关系是关键.
研究的目的:
- 调查GdDOTA-1AmP中的单个酸盐组是否可以催化质子交换.
- 为了描述GdDOTA-1AmP的pH依赖性放松性 (r1).
- 评估GdDOTA-1AmP作为响应pH的MRI对比剂的潜力.
主要方法:
- 对GdDOTA-1AmP.P.的合成和表征
- 在20MHz的pH值 (2.5-9) 范围内测量r1放松度.
- 与其他酸盐类型的pH依赖性放松性进行比较.
- 组织生物分布和清除率的评估.
- 在小型动物成像磁场 (7和9.4T) 中放松度的评估.
主要成果:
- GdDOTA-1AmP显示,随着pH从9降至2.5,r1缓解率从3.0升至6.3mM-1s-1平稳增加,pH从9降至2.5.
- 对于GdDOTA-1AmP的r1的pH依赖与其单酸基的脱相关.
- 与其他类似物不同,GdDOTA-1AmP没有表现出双相pH依赖.
- 生物分布和清除比高负荷的类似物更有利.
- 在更高的磁场 (7和9.4T) 时,r1的pH依赖性降低.
结论:
- 一个单一的酸盐组可以影响GBCA的pH依赖性放松性.
- GdDOTA-1AmP独特的pH反应机制为设计新型对比剂提供了洞察力.
- 在更高的磁场下降的pH敏感性限制了其目前用于小动物定量pH成像的实用性.
- 对酸机制的进一步研究可以指导开发有效的pH响应MRI剂.
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