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Salicylic Acid Conjugated Dendrimers Are a Tunable, High Performance CEST MRI NanoPlatform
Nano Letters ( IF 9.6 ) Pub Date : 2016-03-01 00:00:00 , DOI: 10.1021/acs.nanolett.5b04517 Wojciech G Lesniak , Nikita Oskolkov , Xiaolei Song , Bachchu Lal , Xing Yang , Martin Pomper , John Laterra , Sridhar Nimmagadda , Michael T McMahon 1
Nano Letters ( IF 9.6 ) Pub Date : 2016-03-01 00:00:00 , DOI: 10.1021/acs.nanolett.5b04517 Wojciech G Lesniak , Nikita Oskolkov , Xiaolei Song , Bachchu Lal , Xing Yang , Martin Pomper , John Laterra , Sridhar Nimmagadda , Michael T McMahon 1
Affiliation
Chemical exchange saturation transfer (CEST) is a novel MRI contrast mechanism that is well suited for imaging, however, existing small molecule CEST agents suffer from low sensitivity. We have developed salicylic acid conjugated dendrimers as a versatile, high performance nanoplatform. In particular, we have prepared nanocarriers based on generation 5-poly(amidoamine) (PAMAM) dendrimers with salicylic acid covalently attached to their surface. The resulting conjugates produce strong CEST contrast 9.4 ppm from water with the proton exchange tunable from ∼1000 s–1 to ∼4500 s–1 making these dendrimers well suited for sensitive detection. Furthermore, we demonstrate that these conjugates can be used for monitoring convection enhanced delivery into U87 glioblastoma bearing mice, with the contrast produced by these nanoparticles persisting for over 1.5 h and distributed over ∼50% of the tumors. Our results demonstrate that SA modified dendrimers present a promising new nanoplatform for medical applications.
中文翻译:
水杨酸共轭树枝状聚合物是一种可调谐的高性能 CEST MRI 纳米平台
化学交换饱和转移(CEST)是一种新型的 MRI 对比机制,非常适合成像,但现有的小分子 CEST 试剂灵敏度较低。我们开发了水杨酸共轭树枝状聚合物作为多功能、高性能纳米平台。特别是,我们制备了基于第 5 代聚酰胺胺 (PAMAM) 树枝状聚合物的纳米载体,其表面共价连接有水杨酸。所得缀合物与水产生强烈的 CEST 对比度 9.4 ppm,质子交换可在~1000 s –1至~4500 s –1范围内调节,使这些树枝状聚合物非常适合灵敏检测。此外,我们证明这些缀合物可用于监测对流增强的递送至携带 U87 胶质母细胞瘤的小鼠中,这些纳米颗粒产生的对比度持续超过 1.5 小时,并分布在约 50% 的肿瘤中。我们的结果表明,SA 修饰的树枝状大分子为医疗应用提供了一种有前景的新型纳米平台。
更新日期:2016-03-01
中文翻译:
水杨酸共轭树枝状聚合物是一种可调谐的高性能 CEST MRI 纳米平台
化学交换饱和转移(CEST)是一种新型的 MRI 对比机制,非常适合成像,但现有的小分子 CEST 试剂灵敏度较低。我们开发了水杨酸共轭树枝状聚合物作为多功能、高性能纳米平台。特别是,我们制备了基于第 5 代聚酰胺胺 (PAMAM) 树枝状聚合物的纳米载体,其表面共价连接有水杨酸。所得缀合物与水产生强烈的 CEST 对比度 9.4 ppm,质子交换可在~1000 s –1至~4500 s –1范围内调节,使这些树枝状聚合物非常适合灵敏检测。此外,我们证明这些缀合物可用于监测对流增强的递送至携带 U87 胶质母细胞瘤的小鼠中,这些纳米颗粒产生的对比度持续超过 1.5 小时,并分布在约 50% 的肿瘤中。我们的结果表明,SA 修饰的树枝状大分子为医疗应用提供了一种有前景的新型纳米平台。