早期运动干预对脑缺血大鼠脑神经髓鞘的影响及机制研究.

Objective To investigate the effect and potential mechanism of early exercise intervention on cerebral myelin in cerebral ischemia rats. Methods A total of 18 SD rats were randomly divided into the sham group, the middle cerebral artery occlusion resting group (MCAO-SED) and the middle cerebral artery occlusion exercise group (MCAO-EX), with 6 rats in each group. Except the sham group, the middle cerebral artery occlusion model was prepared by modified Longa line embolization method in other groups. After modeling, rats in the MCAO-EX group were placed on a treadmill for exercise intervention for 28 days. Neurological function was assessed by modified neural function deficit score (mNSS). Infarct volume was detected by MRI scanning (T2), myelin basic protein (MBP) expression was detected by immunofluorescence. Myelin sheath structure was detected by transmission electron microscopy. Western blot assay was used to detect endoplasmic reticulum stress-related protein expression. Apoptosis was detected by TUNEL staining. Results After 28 days of intervention, compared with the MCAO-SED group, the nerve function recovered well in the MCAO-EX group, infarct volume decreased, myelin integrity increased, MBP fluorescence intensity expression increased and MBP expression level increased. The expression levels of ATF6, p-IRE1, p-PERK and cleaved caspase 3 were significantly decreased, and apoptosis was reduced. Conclusion Early exercise can inhibit endoplasmic reticulum stress-induced apoptosis, promote cerebral myelin repair, reduce infarct size and improve nerve function. [ABSTRACT FROM AUTHOR]