title: Tracking of iron-labeled human neural stem cells by magnetic resonance imaging in cell replacement therapy for Parkinson's disease.
abstract: Human neural stem cells (hNSCs) derived from the ventral mesencephalon are powerful research tools and candidates for cell therapies in Parkinson's disease. However, their clinical translation has not been fully realized due, in part, to the limited ability to track stem cell regional localization and survival over long periods of time after in vivo transplantation. Magnetic resonance imaging provides an excellent non-invasive method to study the fate of transplanted cells in vivo. For magnetic resonance imaging cell tracking, cells need to be labeled with a contrast agent, such as magnetic nanoparticles, at a concentration high enough to be easily detected by magnetic resonance imaging. Grafting of human neural stem cells labeled with magnetic nanoparticles allows cell tracking by magnetic resonance imaging without impairment of cell survival, proliferation, self-renewal, and multipotency. However, the results reviewed here suggest that in long term grafting, activated microglia and macrophages could contribute to magnetic resonance imaging signal by engulfing dead labeled cells or iron nanoparticles dispersed freely in the brain parenchyma over time.
authors.affiliation: Centre for Biomedical Technology, Polytechnic University of Madrid, Madrid, Spain; Biomedical Research Networking Center of Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain.
authors.forename: Milagros
authors.initials: M
authors.lastname: Ramos-Gómez
authors.affiliation: Department of Molecular Biology and Center of Molecular Biology "Severo Ochoa", Autonomous University of Madrid-C.S.I.C, Madrid, Spain.
authors.forename: Alberto
authors.identifier: 0000-0003-3927-6699
authors.initials: A
authors.lastname: Martínez-Serrano
keywords: Parkinson's disease; human neural stem cells; magnetic nanoparticles; magnetic resonance imaging; stem cell transplantation