AUTHOR=Wuerfel Eva , Smyth Maureen , Schellenberger Eyk , Glumm Jana , Prozorovski Timour , Aktas Orhan , Schulze-Topphoff Ulf , Schnorr Jörg , Wagner Susanne , Taupitz Matthias , Infante Carmen , Wuerfel Jens TITLE=Electrostatically Stabilized Magnetic Nanoparticles – An Optimized Protocol to Label Murine T Cells for in vivo MRI JOURNAL=Frontiers in Neurology VOLUME=2 YEAR=2011 URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2011.00072 DOI=10.3389/fneur.2011.00072 ISSN=1664-2295 ABSTRACT=

We present a novel highly efficient protocol to magnetically label T cells applying electrostatically stabilized very small superparamagnetic iron oxide particles (VSOP). Our long-term aim is to use magnetic resonance imaging (MRI) to investigate T cell dynamics in vivo during the course of neuroinflammatory disorders such as experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis. Encephalitogenic T cells were co-incubated with VSOP, or with protamine-complexed VSOP (VProt), respectively, at different conditions, optimizing concentrations and incubation times. Labeling efficacy was determined by atomic absorption spectrometry as well as histologically, and evaluated on a 7 T MR system. Furthermore, we investigated possible alterations of T cell physiology caused by the labeling procedure. T cell co-incubation with VSOP resulted in an efficient cellular iron uptake. T2 times of labeled cells dropped significantly, resulting in prominent hypointensity on T2*-weighted scans. Optimal labeling efficacy was achieved by VProt (1 mM Fe/ml, 8 h incubation; T2 time shortening of ∼80% compared to untreated cells). Although VSOP promoted T cell proliferation and altered the ratio of T cell subpopulations toward a CD4+ phenotype, no effects on CD4 T cell proliferation or phenotypic stability were observed by labeling in vitro differentiated Th17 cells with VProt. Yet, high concentrations of intracellular iron oxide might induce alterations in T cell function, which should be considered in cell tagging studies. Moreover, we demonstrated that labeling of encephalitogenic T cells did not affect pathogenicity; labeled T cells were still capable of inducing EAE in susceptible recipient mice.