期刊
ACS APPLIED BIO MATERIALS
卷 2, 期 12, 页码 5390-5403出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsabm.9b00709
关键词
stem cells; calcium phosphate nanoparticles; contrast agent; magnetic resonance imaging; brain inflammation
资金
- Department of Science and Technology (DST), Govt of India
- Agency for Science, Technology and Research (A*STAR), Ministry of Trade and Industry, Singapore [INT/SIN/P06/2015]
- ICMR-India [45/29/2018-NAN/BMS]
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 similar to 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 similar to 87% labeling efficiency under optimized conditions (100 mu g/mL, 6 h). Most importantly, the labeling was not found to affect the neurogenic differentiation potential of MSCs. MRI of labeled cells (similar to 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 x 10(6) 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.
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