replacement technology. To address this concern, we evaluated our previously reported Mn-based MRI contrast agent, Mn-PyC3A, and nine newly synthesized derivatives as liver specific MRI contrast agents. Within this focused library the transient liver uptake and rate of blood clearance are directly correlated with log P. The complex Mn-PyC3A-3-OBn emerged as the lead candidate due to a combination of high relaxivity
由于对Gd保留和延迟毒性的担忧,基于Gd的MRI造影剂(GBCA)受到了严格的监管审查。由无环Gd螯合物组成的三个GBCA(最容易释放Gd的GBCA类)不再在欧洲销售。特别令人关注的是无环螯合物仍可用于肝脏扫描,那里的诊断需求未得到满足,并且没有替代技术。为了解决这个问题,我们评估了我们先前报道的基于Mn的MRI造影剂Mn-PyC3A和九种新合成的衍
生物作为肝脏特异性MRI造影剂。在这个重点库中,瞬时肝脏吸收和血液清除率与log P直接相关。复杂的Mn-PyC3A-3-OBn由于具有高度的松弛性,快速的血液清除和对肝细胞的强烈吸收而成为主要候选药物。Mn-PyC3A-3-OBn在鼠模型中使肝脏肿瘤明显低强度,并且在注射后24小时内被完全消除。