Ferumoxytol, an iron replacement product, is a new type of superparamagnetic iron oxide ap- proved by the US Food and Drug Administration. Herein, we assessed the feasibility of tracking transplanted human adipose-der...Ferumoxytol, an iron replacement product, is a new type of superparamagnetic iron oxide ap- proved by the US Food and Drug Administration. Herein, we assessed the feasibility of tracking transplanted human adipose-derived stem cells labeled with ferumoxytol in middle cerebral artery occlusion-injured rats by 3.0 T MRI in vivo. 1 × 104 human adipose-derived stem cells labeled with ferumoxytol-heparin-protamine were transplanted into the brains of rats with middle cerebral artery occlusion. Neurologic impairment was scored at 1, 7, 14, and 28 days after transplantation. T2-weighted imaging and enhanced susceptibility-weighted angiography were used to observe transplanted cells. Results of imaging tests were compared with results of Prussian blue staining. The modified neurologic impairment scores were significantly lower in rats transplanted with cells at all time points except I day post-transplantation compared with rats without transplantation. Regions with hypointense signals on T2-weighted and enhanced susceptibility-weighted angiography images corresponded with areas stained by Prussian blue, suggesting the presence of superparamagnetic iron oxide particles within the engrafted cells. Enhanced susceptibility-weighted angiography image exhibited better sensitivity and contrast in tracing ferumoxytol-heparin-protamine-labeled human adipose-derived stem ceils compared with T2-weighted imaging in routine MRI.展开更多
目的评价计算机体层摄影(CT)及磁共振(MR)诊断颅内未出血性动静脉畸形(nAVM)的价值与限度。方法 20例经数字减影血管造影(DSA)证实的颅内nAVM病例,全部行CT平扫、MR平扫加增强及磁共振血管成像(MRA)检查,5例行磁敏感加权成像(SWI)及三...目的评价计算机体层摄影(CT)及磁共振(MR)诊断颅内未出血性动静脉畸形(nAVM)的价值与限度。方法 20例经数字减影血管造影(DSA)证实的颅内nAVM病例,全部行CT平扫、MR平扫加增强及磁共振血管成像(MRA)检查,5例行磁敏感加权成像(SWI)及三维增强磁共振血管成像(3D CEMRA)检查。结果 20例中15例位于脑皮质及皮髓交界区,2例位于深部脑白质,2例位于侧脑室内,1例位于幕下,CT平扫表现为以高密度为主的高、等、低混杂密度;16例表现为特征性MR流空血管影,其中12例显示明确的供血动脉及引流静脉,5例3D CE MRA均显示明确的异常血管团;1例位于直窦旁,以局部脑质萎缩为主;1例左侧脑室前角旁,以血栓机化为主。结论 nAVM随诊期间的出血预测因素为易出血脑动静脉畸形表现,复杂的供血与深静脉引流方式,自发性出血较低的nAVM患者无此类因素存在;MR平扫结合MRA、SWI、3D CE MRA各序列成像对异常血管团的显示优于DSA,对nAVM能无创性准确定位、定性,并可显示其结构组成,可作为临床高度怀疑脑nAVM患者的首选影像检查方法。展开更多
基金supported by the Science and Technology Plan Project of Dalian City in China,No.2014E14SF186
文摘Ferumoxytol, an iron replacement product, is a new type of superparamagnetic iron oxide ap- proved by the US Food and Drug Administration. Herein, we assessed the feasibility of tracking transplanted human adipose-derived stem cells labeled with ferumoxytol in middle cerebral artery occlusion-injured rats by 3.0 T MRI in vivo. 1 × 104 human adipose-derived stem cells labeled with ferumoxytol-heparin-protamine were transplanted into the brains of rats with middle cerebral artery occlusion. Neurologic impairment was scored at 1, 7, 14, and 28 days after transplantation. T2-weighted imaging and enhanced susceptibility-weighted angiography were used to observe transplanted cells. Results of imaging tests were compared with results of Prussian blue staining. The modified neurologic impairment scores were significantly lower in rats transplanted with cells at all time points except I day post-transplantation compared with rats without transplantation. Regions with hypointense signals on T2-weighted and enhanced susceptibility-weighted angiography images corresponded with areas stained by Prussian blue, suggesting the presence of superparamagnetic iron oxide particles within the engrafted cells. Enhanced susceptibility-weighted angiography image exhibited better sensitivity and contrast in tracing ferumoxytol-heparin-protamine-labeled human adipose-derived stem ceils compared with T2-weighted imaging in routine MRI.
文摘目的评价计算机体层摄影(CT)及磁共振(MR)诊断颅内未出血性动静脉畸形(nAVM)的价值与限度。方法 20例经数字减影血管造影(DSA)证实的颅内nAVM病例,全部行CT平扫、MR平扫加增强及磁共振血管成像(MRA)检查,5例行磁敏感加权成像(SWI)及三维增强磁共振血管成像(3D CEMRA)检查。结果 20例中15例位于脑皮质及皮髓交界区,2例位于深部脑白质,2例位于侧脑室内,1例位于幕下,CT平扫表现为以高密度为主的高、等、低混杂密度;16例表现为特征性MR流空血管影,其中12例显示明确的供血动脉及引流静脉,5例3D CE MRA均显示明确的异常血管团;1例位于直窦旁,以局部脑质萎缩为主;1例左侧脑室前角旁,以血栓机化为主。结论 nAVM随诊期间的出血预测因素为易出血脑动静脉畸形表现,复杂的供血与深静脉引流方式,自发性出血较低的nAVM患者无此类因素存在;MR平扫结合MRA、SWI、3D CE MRA各序列成像对异常血管团的显示优于DSA,对nAVM能无创性准确定位、定性,并可显示其结构组成,可作为临床高度怀疑脑nAVM患者的首选影像检查方法。
