Anatomical and behavioral outcomes following a graded hemi-contusive cervical spinal cord injury model in mice.
Behav Brain Res
; 419: 113698, 2022 02 15.
Article
en En
| MEDLINE
| ID: mdl-34856301
ABSTRACT
BACKGROUND:
A graded hemi-contusion spinal cord injury produces complex anatomical deformation of the spinal cord parenchyma. The relationship between lesion severity and behavioral consequences in a novel contusion mouse model remains unknown.PURPOSE:
We aimed to establish a graded cervical hemi-contusion spinal cord injury model in mice and investigate the correlation between graded anatomical damage to the spinal cord and resulting behavioral impairments.METHODS:
Thirty-two mice were divided into groups of 1.2 mm, 1.5 mm and sham. The tip of an impactor with a diameter of 1 mm was utilized to compress the left dorsal cord of C5 by 1.2 mm or 1.5 mm at a speed of 300 mm/s. Forelimb motor function was evaluated using rearing, grooming and grip-strength tests before and after the injuries. Histologically the area of white matter sparing, gray matter sparing and lesion area were quantified at 6-week-post-injury.RESULTS:
Behavioral assessments showed a more severe forelimb functional deficit in 1.5 mm contusion displacements relative to 1.2 mm contusion displacements after injury. The 1.2 mm hemi-contusion mainly caused damage to the dorsal fasciculus, ventral and dorsal horn, while the 1.5 mm hemi-contusion lead to additional damage extending to ventral fasciculus. Sparing of the gray and white matter at the epicenter was 36.8 ± 2.4% and 12.4 ± 2.6% in the 1.2 mm group, and 27.6 ± 4.0% and 4.1 ± 2.2% in the 1.5 mm group, respectively. Furthermore, the lesion area was 20.8 ± 3.0% and 36.0 ± 2.1% in the 1.2 mm and 1.5 mm groups, respectively. There was a significant correlation between the performance in the grooming test and white matter sparing, and between grip-test strength and gray matter sparing.CONCLUSION:
The present study demonstrates that a hemi-contusion cervical spinal cord injury in mice can be graded by contusion displacement and that there is a correlation between anatomical and behavioral outcomes. This study provides a means for determining the severity of lesions in a contusion mouse model.Palabras clave
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Banco de datos:
MEDLINE
Asunto principal:
Traumatismos de la Médula Espinal
/
Conducta Animal
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Médula Cervical
Límite:
Animals
Idioma:
En
Año:
2022
Tipo del documento:
Article