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The evolution of traumatic brain injury in a rat focal contusion model. NMR Biomed 2013 Apr;26(4):468-79 PMID: 23225324 PMCID: PMC3596464

Pubmed ID

23225324

Abstract

Serial MRI facilitates the in vivo analysis of the intra- and intersubject evolution of traumatic brain injury lesions. Despite the availability of MRI, the natural history of experimental focal contusion lesions in the controlled cortical impact (CCI) rat model has not been well described. We performed CCI on rats and MRI during the acute to chronic stages of cerebral injury to investigate the time course of changes in the brain. Female Wistar rats underwent CCI of their left motor cortex with a flat impact tip driven by an electromagnetic piston. In vivo MRI was performed at 7 T serially over 6 weeks post-CCI. The appearances of CCI-induced lesions and lesion-associated cortical volumes were variable on MRI, with the percentage change in cortical volume of the CCI ipsilateral side relative to the contralateral side ranging from 18% within 2 h of injury on day 0 to a peak of 35% on day 1, and a trough of -28% by week 5/6, with an average standard deviation of ± 14% at any given time point. In contrast, the percentage change in cortical volume of the ipsilateral side relative to the contralateral side in control rats was not significant (1 ± 2%). Hemorrhagic conversion within and surrounding the CCI lesion occurred between days 2 and 9 in 45% of rats, with no hemorrhage noted on the initial scan. Furthermore, hemorrhage and hemosiderin within the lesion were positive for Prussian blue and highly autofluorescent on histological examination. Although some variation in injuries may be technique related, the divergence of similar lesions between initial and final scans demonstrates the inherent biological variability of the CCI rat model.

Author List

Turtzo LC, Budde MD, Gold EM, Lewis BK, Janes L, Yarnell A, Grunberg NE, Watson W, Frank JA

Author

Matthew Budde PhD Associate Professor in the Neurosurgery department at Medical College of Wisconsin




Scopus

2-s2.0-84875054190   14 Citations

MESH terms used to index this publication - Major topics in bold

Animals
Behavior, Animal
Brain Injuries
Cerebral Cortex
Cerebral Hemorrhage
Contusions
Disease Models, Animal
Female
Magnetic Resonance Imaging
Microscopy, Fluorescence
Organ Size
Rats, Wistar
jenkins-FCD Prod-288 ba989beae37c4807010653a17407cd2d1f5e0810