title: Background migration of USPIO/MLs is a major drawback for in situ labeling of endogenous neural progenitor cells.
abstract: MR-labeling of endogenous neural progenitor cells (NPCs) to follow up cellular migration with in vivo magnetic resonance imaging (MRI) is a very promising tool in the rapidly growing field of cellular imaging. To date, most of the in situ labeling work has been performed using micron-sized iron oxide particles. In this work magnetoliposomes (MLs), i.e. ultrasmall superparamagnetic iron oxide cores (USPIOs), each individually coated by a phospholipid bilayer, were used as the MR contrast agent. One of the main advantages of MLs is that the phospholipid bilayer allows easy modification of the surface, which creates the opportunity to construct a wide range of MLs optimized for specific biomedical applications. We have investigated the ability of MLs to label endogenous NPCs after direct injection into the adult mouse brain. Whereas MRI revealed contrast relocation towards the olfactory bulb, our data strongly imply that this relocation is independent of the migration of endogenous NPCs but represents background migration of MLs along a white matter tract. Our findings suggest that the small size of USPIOs/MLs intrinsically limits their potential for in situ labeling of NPCs.
authors.affiliation: Bio-Imaging Laboratory, Department of Biomedical Sciences, University of Antwerp, Belgium.
authors.forename: Ruth
authors.initials: R
authors.lastname: Vreys
authors.forename: Stefaan J H
authors.initials: SJ
authors.lastname: Soenen
authors.forename: Marcel
authors.initials: M
authors.lastname: De Cuyper
authors.forename: Annemie
authors.initials: A
authors.lastname: Van der Linden
mesh_terms: D053687:Adult Stem Cells / Q000166:cytology / Q000378:metabolism / Q000502:physiology; D000818:Animals; D002465:Cell Movement / Q000502:physiology; D058948:Cell Tracking / Q000379:methods* / Q000592:standards; D003287:Contrast Media / Q000493:pharmacokinetics*; D005189:False Positive Reactions; D052203:Ferrosoferric Oxide / Q000737:chemistry / Q000493:pharmacokinetics*; D017403:In Situ Hybridization; D008081:Liposomes / Q000008:administration & dosage / Q000493:pharmacokinetics*; D008279:Magnetic Resonance Imaging / Q000379:methods / Q000592:standards; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009068:Movement / Q000502:physiology*; D058953:Neural Stem Cells / Q000166:cytology / Q000000981:diagnostic imaging* / Q000378:metabolism / Q000502:physiology*; D010316:Particle Size; D011859:Radiography; D013194:Staining and Labeling / Q000379:methods
chemical_list: D003287:Contrast Media; D008081:Liposomes; D052203:Ferrosoferric Oxide