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Diffusion characteristics associated with neuronal injury and glial activation following hypoxia-ischemia in the immature brain

West, Tim
Moravec, Matthew D
Back, Stephen A
Dikranian, Krikor
Holtzman, David M
Neil, Jeffrey J
Published in Magnetic Resonance in Medicine. 2011, vol. 66, no. 3, p. 839-45
Abstract To identify quantitative MRI indices of injury in the brain following neonatal hypoxic-ischemic brain injury, we subjected mouse pups to hypoxia-ischemia on postnatal day 7 and obtained conventional and diffusion-weighted in vivo images of the brain 24 h later followed by histological assessment. T(2)-weighted images showed increased signal intensity in the CA1 and CA2 regions of the hippocampus ipsilateral to the injury and adjacent white matter. In contrast, diffusion imaging showed reduced apparent diffusion coefficient (ADC) values in CA1 and CA2, but increased values in the adjacent white matter. Histological analysis showed widespread gliosis with degenerating oligodendrocytes in the ipsilateral hippocampus. In addition, white matter areas that were abnormal by MRI showed an increase in the number of activated microglia (CD45 positive cells). Activated caspase-3 immunostaining showed a marked increase in neurons in the hippocampal regions corresponding to those with reduced ADC, and a quantitative measure of staining showed a statistically significant correlation with the ADC. In contrast, ADC was higher in adjacent white matter, where histology showed activation of microglia and reactive oligodendrocytes but not caspase-3 activation. These results suggest that the ADC response differs between areas of neuronal injury as compared with those showing glial changes without marked cell death.
Keywords AnimalsAnimals, NewbornCorpus Callosum/pathologyDiffusion Magnetic Resonance ImagingGliosis/pathologyHippocampus/pathologyHypoxia-Ischemia, Brain/pathologyImmunohistochemistryMiceMice, Inbred C57BLNerve Fibers, Myelinated/pathologyOligodendroglia/pathologyStaining and LabelingStatistics, Nonparametric
PMID: 21394776
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LODYGENSKY, Gregory Anton et al. Diffusion characteristics associated with neuronal injury and glial activation following hypoxia-ischemia in the immature brain. In: Magnetic Resonance in Medicine, 2011, vol. 66, n° 3, p. 839-45. doi: 10.1002/mrm.22869 https://archive-ouverte.unige.ch/unige:25399

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Deposited on : 2013-01-11

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