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AIM:To track intravascularly transplanted mesenchymal stem cells (MSCs) labeled with superparamagnetic iron oxide (SPIO) by using magnetic resonance imaging (MRI) in an experimental rabbit model of hepatic failure.METHODS:Human MSCs labeled with FDA-approved SPIO particles (Feridex) were transplanted via the mes-enteric vein into rabbits (n=16) with carbon tetrachloride-induced hepatic failure.Magnetic resonance (MR) examinations were performed with a 3.0 T clinical scanner immediately before and 2 h and 1,3,and 7 d after transplantation.Signal intensity (SI) changes on T2weighted MRI were measured,and correlation between MR findings and histomorphologic findings was also investigated.RESULTS:SI on T2-weighted MRI decreased significantly in the liver 2 h after injection of human MSCs and returned gradually to the levels found before injection in 7 d.Changes in SI in the liver at 2 h,1,3,and 7 d were 41.87% ± 9.63%,10.42% ± 4.3%,5.12% ± 1.9%,3.75% ± 1.2%,respectively (P < 0.001).Histologic analyses confirmed the presence of MSCs in the liver,localized mainly in the sinusoids in early period (2 h and 1 d) and concentrated to the border zone in late period (3 and 7 d).The number of iron-positive cells in the liver at 2 h and on 1,3 and 7 d after transplantation was 29.2 ± 4.8,10.1 ± 3.7,6.7 ± 2.2,and 5.8 ± 2.1,respectively (P=0.013).CONCLUSION:Intravascularly injected SPIO-labeled MSCs in an experimental rabbit model of hepatic failure can be detected and followed with MRI.
AIM: To track intravascularly transplanted mesenchymal stem cells (MSCs) labeled with superparamagnetic iron oxide (SPIO) by using magnetic resonance imaging (MRI) in an experimental rabbit model of hepatic failure. METHODS: Human MSCs labeled with FDA-approved SPIO particles (Feridex ) were transplanted via the mes-enteric vein into rabbits (n = 16) with carbon tetrachloride-induced hepatic failure. Magnetic resonance (MR) examinations were performed with a 3.0 T clinical scanner immediately before and 2 h and 1,3, and 7 d after transplantation .Signal intensity (SI) changes on T2 weighted MRI were measured, and correlation between MR findings and histomorphologic findings was also investigated. RESULTS: SI on T2-weighted MRI decreased significantly in the liver after 2 h injection of human MSCs returned gradually to the levels found before injection in 7 d.Changes in SI in the liver at 2 h, 1,3 and 7 d were 41.87% ± 9.63%, 10.42% ± 4.3%, 5.12% ± 1.9%, 3.75% ± 1.2%, respectively (P <0.001) .His Tumors analyzed the presence of MSCs in the liver, localized mainly in the sinusoids in early period (2 h and 1 d) and concentrated to the border zone in late periods (3 and 7 d). The number of iron-positive cells in the liver at 2 h and on 1,3 and 7 d after transplantation was 29.2 ± 4.8, 10.1 ± 3.7, 6.7 ± 2.2, and 5.8 ± 2.1, respectively (P = 0.013) .CONCLUSION: Intravascularly injected SPIO-labeled MSCs in an experimental rabbit model of hepatic failure can be detected and followed with MRI.