Purpose To prepare superparamagnetic iron oxide nanoparticles (SPION) probe targeted and modified by MUC1 murin (MUC1) in order to explore its MRI characteristics in pancreatic cancer transplantation model.Materials and Methods Chemical conjugate method was adopted for coupled response of MUC1 and SPION to construct targeted probe and tested its basic physical properties,including water and diameter,surface charge and MR signal measuring.Meanwhile,nude mice model of pancreatic cancer transplant subcutaneous sarcoma was set up to study imaging effect inside the nude mice.Transplant sarcoma specimen was taken and immunohistochemical and Western blot were adopted to measure MUC1 expression.Results Partial size of the prepared particle probe was approximately 63.5 nm and surface charge was about 10.2 mV.The probe solution could obviously decrease MR transverse relaxation time (T2 value).In vitro experiment,MUC 1 could selectively gather on nude mice transplant sarcoma model could greatly lower T2 signal intensity.Conclusion Prepared probe has small partial size,superparamagnetic and other advantages.It can realize combination with pancreatic cancer tissue specificity and provide reliable in vivo iconology in early stage for disease diagnosis through vitro imaging.%目的 制备MUC1黏蛋白1(MUC1)靶向修饰的探针超顺磁纳米颗粒(SPION),探讨其在胰腺癌移植模型中的MRI特点.材料与方法 采用化学共轭法将MUC1与SPION耦联,构建靶向探针,检测其基本物理特性,包括水和直径、表面电荷及MR信号测定;同时建立胰腺癌皮下移植瘤裸鼠模型,研究在裸鼠体内的成像效果.取移植瘤标本,采用免疫组化及蛋白质印迹法测定MUC1的表达.结果 制备的分子探针颗粒大小约为63.5 nm,表面电荷约为10.2 mV,该探针溶液能显著降低MR横向弛豫时间(T2值).在体内实验中,MUC1可以选择性地积聚在裸鼠移植瘤模型上,并能显著降低T2信号强度.结论 制备的探针具有粒径小、超顺磁性等优点,并能实现与胰腺癌组织特异性结合,通过体内成像,为疾病的诊断提供早期可靠的活体影像学资料.
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