Axonal remodeling is a critical aspect of ischemic brain repair processes and contributes to spontaneous functional *** previous in vitro study demonstrated that exosomes/small extracellular vesicles(sEVs)isolated fro...
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Axonal remodeling is a critical aspect of ischemic brain repair processes and contributes to spontaneous functional *** previous in vitro study demonstrated that exosomes/small extracellular vesicles(sEVs)isolated from cerebral endothelial cells(CEC-sEVs)of ischemic brain promote axonal growth of embryonic cortical neurons and that microRNA 27a(miR-27a)is an elevated miRNA in ischemic *** the present study,we investigated whether normal CEC-sEVs engineered to enrich their levels of miR-27a(27a-sEVs)further enhance axonal growth and improve neurological outcomes after ischemic stroke when compared with treatment with non-engineered CEC-sEVs.27a-sEVs were isolated from the conditioned medium of healthy mouse CECs transfected with a lentiviral miR-27a expression *** EVs isolated from CECs transfected with a scramble vector(Scra-sEVs)were used as a *** male mice were subjected to permanent middle cerebral artery occlusion and then were randomly treated with 27a-sEVs or *** array of behavior assays was used to measure neurological *** with treatment of ischemic stroke with Scra-sEVs,treatment with 27a-sEVs significantly augmented axons and spines in the peri-infarct zone and in the corticospinal tract of the spinal grey matter of the denervated side,and significantly improved neurological *** vitro studies demonstrated that CEC-sEVs carrying reduced miR-27a abolished 27a-sEV-augmented axonal *** analysis revealed that 27a-sEVs systemically administered preferentially localized to the pre-synaptic active zone,while quantitative reverse transcription-polymerase chain reaction and Western Blot analysis showed elevated miR-27a,and reduced axonal inhibitory proteins Semaphorin 6A and Ras Homolog Family Member A in the peri-infarct *** of the Clathrin-dependent endocytosis pathway substantially reduced neuronal internalization of *** data provide evidence that 27a-sEVs have
西非埃博拉病毒病(简称“埃博拉”)暴发疫情已夺走近11300人的生命,其严重程度和流行进程促使许多未受影响的国家为来自埃博拉疫情国家的输入病例作准备。2014年10月,美国疾病预防控制中心(CDC)和美国国土安全部(Department of H...
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西非埃博拉病毒病(简称“埃博拉”)暴发疫情已夺走近11300人的生命,其严重程度和流行进程促使许多未受影响的国家为来自埃博拉疫情国家的输入病例作准备。2014年10月,美国疾病预防控制中心(CDC)和美国国土安全部(Department of Homel and Security,DHS)在纽约市约翰肯尼迪国际机场、芝加哥奥黑尔国际机场、新泽西纽瓦克自由国际机场、亚特兰大哈兹菲尔德杰克逊国际机场、弗吉尼亚州华盛顿杜勒斯国际机场等5个美国机场实行强化入境风险评估和管理。
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