Polyamine-Substituted Gadolinium Chelates: A New Class of Intracellular Contrast Agents for Magnetic Resonance Imaging of Tumors
作者:Markus Wolf、William E. Hull、Walter Mier、Sabine Heiland、Ulrike Bauder-Wüst、Ralf Kinscherf、Uwe Haberkorn、Michael Eisenhut
DOI:10.1021/jm061003a
日期:2007.1.1
A new class of intracellular contrast agents (CA) for magnetic resonance imaging has been developed, based on Gd(DTPA) with two positively charged amide-linked substituents. Uptake of Gd(DTPA) into cultured tumor cell lines (B16 mouse melanoma, MH3924A Morris hepatoma) was below the detection limit while CA with the melanin-binding pharmacophore 2-(diethylamino)ethylamine reached intracellular concentrations
基于具有两个带正电的酰胺连接取代基的Gd(DTPA),已经开发出了一类用于磁共振成像的新型细胞内造影剂(CA)。Gd(DTPA)对培养的肿瘤细胞系(B16小鼠黑素瘤,MH3924A Morris肝癌)的摄取低于检测极限,而带有黑色素结合药效团2-(二乙基氨基)乙胺的CA达到细胞内浓度约。黑色素瘤为0.03 fmol /细胞(约20 microM),肝癌为0.02 fmol /细胞(在10 microM CA下为24 h)。使用多胺取代基双(2-氨基乙基)胺或亚精胺,黑色素瘤(0.083 fmol /细胞)的CA摄取增加至3倍,肝癌(0.18 fmol /细胞)的CA摄取增加至9倍。多胺转运抑制剂苄基紫精减少了多胺取代的CA的吸收。三种Gd-DTPA-多胺复合物的摩尔弛豫度在溶液中的游离复合物在5.6-6.9范围内,在Morris肝癌细胞沉淀中在7.7-23.5 s-1 mM-1范围内。MH3924A肿瘤大鼠在2