首页> 外文期刊>Acta Radiologica >Effects of magnetically labeled exogenous endothelial progenitor cells on cerebral blood perfusion and microvasculature alterations after traumatic brain injury in rat model.
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Effects of magnetically labeled exogenous endothelial progenitor cells on cerebral blood perfusion and microvasculature alterations after traumatic brain injury in rat model.

机译:磁性标记的外源性内皮祖细胞对大鼠脑外伤后脑血灌流和微脉管系统改变的影响。

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Increasing evidence suggests that endothelial progenitor cells (EPCs), a subgroup of bone marrow hematopoietic stromal cells, play a critical role in neovascularization and tissue repair.To explore the effect of exogenous EPCs on the cerebral blood perfusion and microvessels in the injured region in rat model with traumatic brain injury (TBI).EPCs were collected from the spleens of healthy Sprague-Dawley rats. Fifty-four Sprague-Dawley rats were randomly divided into six groups. The controlled cortical impact TBI was performed. Spleen-derived exogenous EPCs labeled with super-paramagnetic iron oxide (SPIO) (SPIO-EPCs) were transplanted into the blood by tail vein of rats at 6 and 12 h after TBI, respectively. Magnetic resonance imaging (MRI) and computed tomography perfusion imaging were performed at various time points. Microvascular density was determined by immunohistochemistry.In SPIO-EPCs group, patchlike hypointensities were detected in the injured region at 24 h after transplantation, and the range of hypointensities tended to expand gradually over time on MRI, which was confirmed by Prussian blue staining. Computed tomography perfusion imaging parameters were gradually developed from hyperperfusion to normal, while, microvascular density was gradually increased during 72 to 168 h after injury. The values of these indices in SPIO-EPCs group were significantly lower than those in SPIO-alone group at the same time point, but no significant differences were found in different time groups.The intravenously transplanted EPCs diminish the brain injury through restoring cerebral blood perfusion and increasing the cerebral microvasculature in the injured region in rat model with TBI.
机译:越来越多的证据表明,内皮祖细胞(EPC)是骨髓造血基质细胞的一个亚类,在新生血管形成和组织修复中起着至关重要的作用。 EPCs是从健康的Sprague-Dawley大鼠的脾脏中收集的。将54只Sprague-Dawley大鼠随机分为六组。进行了可控的皮质撞击TBI。 TBI后6和12小时,分别用大鼠的尾静脉将标有超顺磁性氧化铁(SPIO)的脾源性外源EPC(SPIO-EPC)移植到血液中。在不同时间点进行磁共振成像(MRI)和计算机断层扫描灌注成像。通过免疫组织化学测定微血管密度。在SPIO-EPCs组中,移植后24小时在损伤区域检测到斑片状低强度,并且在MRI上低强度的范围随时间逐渐扩大,这被普鲁士蓝染色所证实。计算机断层扫描的灌注成像参数从高灌注逐渐发展到正常,而微血管密度在受伤后72至168 h逐渐增加。在同一时间点,SPIO-EPCs组的这些指标值均显着低于单独使用SPIO的组,但在不同时间组中没有发现显着差异。静脉移植的EPCs通过恢复脑血流灌注减轻了脑损伤。并在TBI大鼠模型中增加受伤部位的脑微血管。

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