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nCP:Fe—A Biomineral Magnetic Nanocontrast Agent for Tracking Implanted Stem Cells in Brain Using MRI
ACS Applied Bio Materials ( IF 4.6 ) Pub Date : 2019-10-28 , DOI: 10.1021/acsabm.9b00709
Ida M Anna 1 , Binulal N Sathy 1 , Anusha Ashokan 1 , Genekehal Siddaramana Gowd 1 , Ranjith Ramachandran 1 , Ayalur Kodakara Kochugovindan Unni 2 , Maneesh Manohar 1 , DeepthiMol Chulliyath 1 , Shantikumar Nair 1 , Kishore Bhakoo 3 , Manzoor Koyakutty 1
Affiliation  

In vivo tracking of transplanted stem cells to monitor their migration, biodistribution, and engraftment in the host tissue is important for assessing the efficacy of stem cell therapeutics. Here, we report a biomineral nanocontrast agent, iron doped calcium phosphate nanoparticles (nCP:Fe), for the in vivo tracking of stem cells in brain using magnetic resonance imaging (MRI). We have synthesized ∼100 nm sized nCP nanoparticles doped with 9.81 wt % Fe3+. In vitro studies using mesenchymal stem cells (MSCs) showed excellent biocompatibility for nCP:Fe with ∼87% labeling efficiency under optimized conditions (100 μg/mL, 6 h). Most importantly, the labeling was not found to affect the neurogenic differentiation potential of MSCs. MRI of labeled cells (∼22.34 pg Fe/cell) showed significant reduction in T2 relaxation time from 195 to 89 ms, rendering dark contrast. In vivo transplantation of labeled cells (1 × 106 cells) in external capsule of healthy rat brain showed a clearly distinguishable hypointense (dark) region in T2 weighted MR images, which remained visible up to 30 days. Subsequently, MRI tracking of labeled MSCs transplanted intracerebrally, 3 mm near to the LPS induced inflammatory site in brain, showed successful migration of labeled MSCs toward the site of inflammation. The cell migration was confirmed ex vivo by Prussian-blue (Fe3+) and Alizarin-red (Ca2+) staining of tissue sections, where individual cells were found migrated to the site of inflammation over a period of 30 days. In summary, our results clearly show that, as a biocompatible mineral composition, nCP:Fe is a promising magnetic nanocontrast agent for MRI based cell tracking in vivo.

中文翻译:

nCP:Fe——一种生物矿物磁性纳米造影剂,用于使用 MRI 跟踪大脑中植入的干细胞

移植干细胞的体内跟踪以监测它们在宿主组织中的迁移、生物分布和植入对于评估干细胞治疗的功效很重要。在这里,我们报告了一种生物矿物纳米造影剂,铁掺杂的磷酸钙纳米粒子 (nCP:Fe),用于使用磁共振成像 (MRI) 对大脑中的干细胞进行体内跟踪。我们合成了掺杂有 9.81 wt% Fe 3+的约 100 nm 尺寸的 nCP 纳米粒子。体外使用间充质干细胞 (MSCs) 的研究表明,在优化条件 (100 μg/mL, 6 h) 下,nCP:Fe 具有优异的生物相容性,标记效率约为 87%。最重要的是,没有发现标记会影响 MSCs 的神经源性分化潜能。标记细胞(~22.34 pg Fe/细胞)的 MRI 显示 T2 弛豫时间从 195 到 89 ms 显着减少,呈现暗对比。标记细胞的体内移植(1 × 10 6健康大鼠脑外囊中的细胞)在 T2 加权 MR 图像中显示出明显可区分的低信号(暗)区域,该区域在 30 天内仍然可见。随后,在脑内 LPS 诱导的炎症部位附近 3 毫米处,对移植到脑内的标记 MSCs 进行 MRI 跟踪,显示标记的 MSCs 成功地向炎症部位迁移。通过对组织切片进行普鲁士蓝 (Fe 3+ ) 和茜素红 (Ca 2+ ) 染色,离体证实了细胞迁移,其中发现单个细胞在 30 天内迁移到炎症部位。总之,我们的研究结果清楚地表明,作为一种生物相容性矿物成分,nCP:Fe 是一种有前途的磁性纳米造影剂,可用于基于 MRI 的细胞追踪体内。
更新日期:2019-10-28
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