Constrained-induced movement therapy promotes motor function recovery by enhancing the remodeling of ipsilesional corticospinal tract in rats after stroke.
Brain Res
; 1708: 27-35, 2019 04 01.
Article
en En
| MEDLINE
| ID: mdl-30471245
ABSTRACT
Constraint-induced movement therapy (CIMT), which forces the use of the impaired limb by restraining the unaffected limb, has been used extensively for the recovery of limb motor function after stroke. However, the underlying mechanism of CIMT remains unclear. Diffusion tensor imaging (DTI) is a well-known neuroimaging technique that reflects the microstructure of white matter tracts and potential changes associated with different treatments. The aim of this study is to use DTI imaging to determine how corticospinal tract (CST) fibers remodel in ischemic rats with CIMT. In the present study, rats were randomly divided into three groups a middle cerebral artery occlusion group (MCAO), a therapeutic group (MCAOâ¯+â¯CIMT), and a sham-operated group (sham). A plaster cast was used to restrict the unaffected limb of the rats in the MCAOâ¯+â¯CIMT group for 14â¯days. The Catwalk system was used to assess the limb motor function of rats. Fractional anisotropy (FA) and the average diffusion coefficient (ADC) of the CST were quantified through DTI. The expression of the c-Jun-N-terminal kinase signaling pathway (JNK) was examined after 14â¯days of CIMT. We found that CIMT could accelerate and enhance motor function recovery, and the MCAOâ¯+â¯CIMT group showed significantly increased FA values in the ipsilesional posterior limb of internal capsule (PLIC) compared with the MCAO group. In addition, we found no significant difference in the ratio of phosphorylated-JNK/total-JNK among the three groups, whereas the expression of P-JNK decreased significantly in the chronic phase of stroke. In conclusion, CIMT-induced functional recovery following ischemic stroke through facilitation of the remodeling of ipsilesional CST, and restoration after ischemic stroke may be associated with the declining value of the ratio of P-JNK/JNK.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Tractos Piramidales
/
Infarto de la Arteria Cerebral Media
/
Rehabilitación de Accidente Cerebrovascular
Límite:
Animals
Idioma:
En
Revista:
Brain Res
Año:
2019
Tipo del documento:
Article
País de afiliación:
China
Pais de publicación:
HOLANDA
/
HOLLAND
/
NETHERLANDS
/
NL
/
PAISES BAJOS
/
THE NETHERLANDS