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Neuropathological differences between rats and mice after spinal cord injury
Author(s) -
Byrnes Kimberly R.,
Fricke Stanley T.,
Faden Alan I.
Publication year - 2010
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.22323
Subject(s) - magnetic resonance imaging , spinal cord , medicine , histology , pathology , pathological , spinal cord injury , immunohistochemistry , histopathology , neuropathology , lesion , gadolinium , anatomy , radiology , chemistry , disease , organic chemistry , psychiatry
Purpose To investigate the utility of noninvasive magnetic resonance imaging (MRI) protocols to demonstrate pathological differences between rats and mice after spinal cord injury (SCI). Rats and mice are commonly used to model SCI; however, histology and immunohistochemistry have shown differences in neuropathology between the two species, including cavity formation and scar/inflammatory responses. Materials and Methods Moderate contusion SCI was performed on adult male rats and mice. At 28 days postinjury, animals underwent T1‐weighted (T1W), with or without gadolinium contrast, or T2‐weighted (T2W) magnetic resonance imaging (MRI), to be compared with histology at the same timepoint. Results In both species, all MRI methods demonstrated changes in spinal cord anatomy. Immunohistochemistry indicated that T2W accurately reflected areas of inflammation and glial scar formation in rats and mice. Quantitation of lesion volume by histology and functional performance correlated best with T2W measurements in both species. Gadolinium contrast accurately reflected the blood‐spinal cord‐barrier permeability in both species, which appeared greater in rats than in mice. Conclusion These data demonstrate that MRI, with either a T1W or T2W protocol, can effectively distinguish pathological differences between rats and mice. J. Magn. Reson. Imaging 2010;32:836–846. © 2010 Wiley‐Liss, Inc.