Suppr超能文献

利用 MRI 引导的聚焦超声破坏血脑屏障,将神经干细胞靶向递送到大脑。

Targeted delivery of neural stem cells to the brain using MRI-guided focused ultrasound to disrupt the blood-brain barrier.

机构信息

Imaging Research, Sunnybrook Research Institute, Toronto, Ontario, Canada.

出版信息

PLoS One. 2011;6(11):e27877. doi: 10.1371/journal.pone.0027877. Epub 2011 Nov 16.

Abstract

Stem cell therapy is a promising strategy to treat neurodegenerative diseases, traumatic brain injury, and stroke. For stem cells to progress towards clinical use, the risks associated with invasive intracranial surgery used to deliver the cells to the brain, needs to be reduced. Here, we show that MRI-guided focused ultrasound (MRIgFUS) is a novel method for non-invasive delivery of stem cells from the blood to the brain by opening the blood brain barrier (BBB) in specific brain regions. We used MRI guidance to target the ultrasound beam thereby delivering the iron-labeled, green fluorescent protein (GFP)-expressing neural stem cells specifically to the striatum and the hippocampus of the rat brain. Detection of cellular iron using MRI established that the cells crossed the BBB to enter the brain. After sacrifice, 24 hours later, immunohistochemical analysis confirmed the presence of GFP-positive cells in the targeted brain regions. We determined that the neural stem cells expressed common stem cell markers (nestin and polysialic acid) suggesting they survived after transplantation with MRIgFUS. Furthermore, delivered stem cells expressed doublecortin in vivo indicating the stem cells were capable of differentiating into neurons. Together, we demonstrate that transient opening of the BBB with MRIgFUS is sufficient for transplantation of stem cells from the blood to targeted brain structures. These results suggest that MRIgFUS may be an effective alternative to invasive intracranial surgery for stem cell transplantation.

摘要

干细胞疗法是治疗神经退行性疾病、创伤性脑损伤和中风的有前途的策略。为了使干细胞能够进入临床应用,需要降低将细胞递送到大脑的侵入性颅内手术相关的风险。在这里,我们展示了 MRI 引导聚焦超声(MRIgFUS)是一种通过在特定脑区打开血脑屏障(BBB)将干细胞从血液递送到大脑的非侵入性方法。我们使用 MRI 引导来靶向超声束,从而将铁标记的、绿色荧光蛋白(GFP)表达的神经干细胞特异性地递送到大鼠脑的纹状体和海马体。使用 MRI 检测细胞铁确立了细胞穿过 BBB 进入大脑。24 小时后处死动物,免疫组织化学分析证实 GFP 阳性细胞存在于靶向脑区。我们确定神经干细胞表达常见的干细胞标志物(巢蛋白和多聚唾液酸),表明它们在 MRIgFUS 移植后存活下来。此外,体内递送的干细胞表达双皮质素,表明干细胞能够分化为神经元。总之,我们证明了 MRIgFUS 短暂打开 BBB 足以将干细胞从血液递送到靶向脑结构。这些结果表明,MRIgFUS 可能是一种替代侵入性颅内手术进行干细胞移植的有效方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efbb/3218061/0abe413f42f6/pone.0027877.g001.jpg

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验