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Accumulation of micron sized iron oxide particles in endothelin‐1 induced focal cortical ischemia in rats is independent of cell migration
Author(s) -
Granot Dorit,
Shapiro Erik M.
Publication year - 2014
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24788
Subject(s) - neuroblast , neurogenesis , subventricular zone , neural stem cell , progenitor cell , endogeny , ischemia , rostral migratory stream , stem cell , neuroscience , cell migration , cell , microbiology and biotechnology , chemistry , pathology , biology , medicine , biochemistry
Purpose Endogenous labeling of stem/ progenitor cells via intracerebroventricular injection of micron‐sized particles of iron oxide (MPIOs) has become standard methodology for MRI of adult neurogenesis. While this method is well characterized in the naïve rodent brain, it has not been fully investigated in disease models. Here, we describe methodological challenges that can confound data analysis when this technique is applied to a rat model of stroke, the endothelin‐1 model of focal cortical ischemia. Methods We intended to track endogenous neuroblast migration from the subventricular zone to the stroke area using previously described methods for in vivo labeling of endogenous neuroblasts with MPIOs and following migration with high resolution MRI. Results MPIOs accumulation in stroke regions of endothelin‐1‐treated brains involves two dynamic steps: an initial rapid cell independent mechanism, followed by slower MPIOs accumulation. While the latter may in part be attributable to cell dependent delivery of the particles, the cell independent mechanism complicates the interpretation of the data. Strategies aimed at prelabeling the stem cell niche reduced cell independent MPIOs accumulation, but failed to abolish it. Conclusion We conclude that MRI‐based neural stem/progenitor cell tracking via direct injection of MPIOs into the lateral and third ventricles, requires significant validation in models of brain disease/trauma. Magn Reson Med 71:1568–1574, 2014. © 2013 Wiley Periodicals, Inc .