Abstract
Purpose
The purpose of this study is to detect myelin-specific T cells, key pathological mediators in early multiple sclerosis, and the corresponding animal model, experimental autoimmune encephalomyelitis (EAE), in the mouse spinal cord.
Procedures
T cells were labeled with the iron-based, magnetic resonance (MR) contrast reagent, Feridex, and the transfection reagent, protamine sulfate, resulting in ∼100% iron-labeling efficiency. Feridex-labeling did not alter the induction of EAE by T cells, and recipients were imaged by a 12-T MR instrument.
Results
Focal hypointense lesions were resolvable to gray or white matter of the lumbar spinal cord in T2-weighted images of the recipients of Feridex-labeled T cells. Lesions corresponded to histological evidence of inflammatory lesions and iron-labeled cells in eight-of-eight mice. In contrast, hypointense lesions were not observed eight-of-eight recipients of unlabeled T cells.
Conclusions
These results demonstrate and provide methodologies for labeling, detecting, and extracting MRI-detectable foci of iron-labeled cells.
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Acknowledgements
This work was supported in part by the Office of Research and Development, Medical Research Service, Department of Veterans Affairs, Oregon Opportunity and NIH-NINDS RO1-NS040801 and R01NS039122. We thank Drs. Ed Neuwelt, MD; Leslie Muldoon, PhD and Jeff Wu, PhD for assistance with the cell-labeling reagents and protocol. This work was supported in part by a grant from the W. M. Keck Foundation.
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Robinson, K.M., Njus, J.M., Phillips, D.A. et al. MR Imaging of Inflammation during Myelin-Specific T Cell-Mediated Autoimmune Attack in the EAE Mouse Spinal Cord. Mol Imaging Biol 12, 240–249 (2010). https://doi.org/10.1007/s11307-009-0272-6
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DOI: https://doi.org/10.1007/s11307-009-0272-6