MRI of magnetically labeled mesenchymal stem cells in hepatic failure model

作者：Son Kyu Ri; Chung Se Young; Kim Hyo Cheol; Kim Hoe Suk; Choi Seung Hong; Lee Jeong Min; Moon Woo Kyung^*

来源：World Journal of Gastroenterology, 2010, 16(44): 5611-5615.

DOI：10.3748/wjg.v16.i44.5611

• Stem cell
• Liver failure
• Magnetic resonance
• Nanoparticle
• Transplantation

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 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.

• 出版日期2010-11-28