In vitro labeled neural stem cells of fetal rats：MRI observation / 中国组织工程研究

ABSTRACT

BACKGROUND:It is necessary to dynamicaly monitor the survival, recognition and migration of neural stem cels after implantation. OBJECTIVE:Toin vitro label fetal rat neural stem cels using MRI technology so as to provide applied evidence of neural stem cels in nervous system repair. METHODS:Fetal rat neural stem cels were isolated, cultured and labeled folowed by identification and cel viability detection. A rat model of cerebral ischemia-reperfusion injury was established. Fetal neural stem cels labeled by superparamagnetic iron oxide particlesin vitro were transplanted into the left brain of model rats, and unlabeled fetal rat neural stem cels transplanted into the right brain. Prussian blue staining was used to observe the colonization and migration of implanted neural stem cels. MRI tracing was employed to monitor the signal changes of neural stem cels dynamicaly afterin vivo transplantation. RESULTS AND CONCLUSION:Over 95% fetal rat neural stem cels were labeled successfuly by superparamagnetic iron oxide particles, and under electron microscope, there were iron particles in labeled neural stem cels, which were concentrated in the lysosome and endosome. MRI results showed that the labeled neural stem cels had a changing trend of low signals. No difference was found in the cel viability between labeled and unlabeled cels, but T2WI and T2*WI signals were reduced in labeled neural stem cels. These findings confirm that superparamagnetic iron oxide-labeled fetal rat neural stem cels can highly express, and MRI tracing can be used forin vivo monitoring of neural stem cels.