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http://dx.doi.org/10.13104/jksmrm.2013.17.3.181

Serial MR Imaging of Magnetically Labeled Humen Umbilical Vein Endothelial Cells in Acute Renal Failure Rat Model  

Lee, Sun Joo (Department of Radiology, College of Medicine, Inje University, Busan Paik Hospital)
Lee, Sang Yong (Department of Diagnostic Radiology, Chonbuk National University Hospital & Medical School)
Kang, Kyung Pyo (Department of Internal Medicine Chonbuk National University Hospital & Medical School)
Kim, Won (Department of Internal Medicine Chonbuk National University Hospital & Medical School)
Park, Sung Kwang (Department of Internal Medicine Chonbuk National University Hospital & Medical School)
Publication Information
Investigative Magnetic Resonance Imaging / v.17, no.3, 2013 , pp. 181-191 More about this Journal
Abstract
Purpose : To evaluate the usefulness of in vivo magnetic resonance (MR) imaging for tracking intravenously injected superparamagnetic iron oxide (SPIO)-labeled human umbilical vein endothelial cells (HUVECs) in an acute renal failure (ARF) rat model. Materials and Methods: HUVECs were labeled with SPIO and poly-L-lysine (PLL) complex. Relaxation rates at 1.5-T MR, cell viability, and labeling stability were assessed. HUVECs were injected into the tail vein of ARF rats (labeled cells in 10 rats, unlabeled cells in 2 rats). Follow-up serial $T2^*$-weighted gradient-echo MR imaging was performed at 1, 3, 5 and 7 days after injection, and the MR findings were compared with histologic findings. Results: There was an average of $98.4{\pm}2.4%$ Prussian blue stain-positive cells after labeling with SPIOPLL complex. Relaxation rates ($R2^*$) of all cultured HUVECs at day 3 and 5 were not markedly decreased compared with that at day 1. The stability of SPIO in HUVECs was maintained during the proliferation of HUVECs in culture media. In the presence of left unilateral renal artery ischemia, $T2^*$-weighted MR imaging performed 1 day after the intravenous injection of labeled HUVECs revealed a significant signal intensity (SI) loss exclusively in the left renal outer medulla regions, but not in the right kidney. The MR imaging findings at days 3, 5 and 7 after intravenous injection of HUVECs showed a SI loss in the outer medulla regions of the ischemically injured kidney, but the SI progressively recovered with time and the right kidney did not have a significant change in SI in the same period. Upon histologic analysis, the SI loss on MR images was correspondent to the presence of Prussian blue stained cells, primarily in the renal outer medulla. Conclusion: MR imaging appears to be useful for in vivo monitoring of intravenously injected SPIO-labeled HUVECs in an ischemically injured rat kidney.
Keywords
Magnetic resonance imaging (MRI); Superparamagnetic iron oxide (SPIO) Human umbilical vein endothelial cells (HUVECs); Cell tracking;
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