Enriched environment boosts the post-stroke recovery of neurological function by promoting autophagy

来源 :中国神经再生研究(英文版) | 被引量 : 0次 | 上传用户:yeyuan1985
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Autophagy is crucial for maintaining cellular homeostasis, and can be activated after ischemic stroke. It also participates in nerve injuryand repair. The purpose of this study was to investigate whether an enriched environment has neuroprotective effects through affectingautophagy. A Sprague-Dawley rat model of transient ischemic stroke was prepared by occlusion of the middle cerebral artery followed byreperfusion. One week after surgery, these rats were raised in either a standard environment or an enriched environment for 4 successive weeks. The enriched environment increased Beclin-1 expression and the LC3-II/LC3-I ratio in the autophagy/lysosomal pathway in thepenumbra of middle cerebral artery-occluded rats. Enriched environment-induced elevations in autophagic activity were mainly observed in neurons. Enriched environment treatment also promoted the fusion of autophagosomes with lysosomes, enhanced the lysosomal activities of lysosomal-associated membrane protein 1, cathepsin B, and cathepsin D, and reduced the expression of ubiquitin and p62. After 4 weeks of enriched environment treatment, neurological deficits and neuronal death caused by middle cerebral artery occlusion/reperfusionwere significantly alleviated, and infarct volume was significantly reduced. These findings suggest that neuronal autophagy is likely theneuroprotective mechanism by which an enriched environment promotes recovery from ischemic stroke. This study was approved by theAnimal Ethics Committee of the Kunming University of Science and Technology, China (approval No. 5301002013855) on March 1, 2019.
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