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Exosome Mediated Delivery of miR-124 Promotes Neurogenesis after Ischemia.

ABSTRACT: The intrinsic ability of neurogenesis after stroke has been proven weak, which results in insufficient repair of injury in the nerve system. Recent studies suggest multiple microRNAs (miRNAs) are involved in the neuroremodeling process. Targeted miRNAs delivery for amplification of neurogenesis is promising in promoting the prognosis after ischemia. Here, we showed that modified exosomes, with rabies virus glycoprotein (RVG) fused to exosomal protein lysosome-associated membrane glycoprotein 2b (Lamp2b), could efficiently deliver miR-124 to the infarct site. Systemic administration of RVG-exosomes loaded with miR-124 promoted cortical neural progenitors to obtain neuronal identity and protect against ischemic injury by robust cortical neurogenesis. Our study suggests that RVG-exosomes can be utilized therapeutically for the targeted delivery of gene drugs to the brain, thus having great potential for clinical applications.

SUBMITTER: Yang J

PROVIDER: S-EPMC5415550 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Exosome Mediated Delivery of miR-124 Promotes Neurogenesis after Ischemia.

Yang Jialei J Zhang Xiufen X Chen Xiangjie X Wang Lei L Yang Guodong G

Molecular therapy. Nucleic acids 20170413

The intrinsic ability of neurogenesis after stroke has been proven weak, which results in insufficient repair of injury in the nerve system. Recent studies suggest multiple microRNAs (miRNAs) are involved in the neuroremodeling process. Targeted miRNAs delivery for amplification of neurogenesis is promising in promoting the prognosis after ischemia. Here, we showed that modified exosomes, with rabies virus glycoprotein (RVG) fused to exosomal protein lysosome-associated membrane glycoprotein 2b ...[more]

PMID: 28624203

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Project description:Background: Cellular communication among different types of vascular cells is indispensable for maintenance of vascular homeostasis and prevention of atherosclerosis (AS). However, the biological mechanism involved in cellular communication among these cells and whether this biological mechanism can be used to treat AS remain unknown. This study hypothesizes that endothelial autophagy mediates the cellular communication of vascular tissue through exosome-mediated delivery of AS-related genes.Methods: ApoE-/- mice fed with high-fat diet (HFD) were received rapamycin to activate autophagy, or were intravenously injected with adeno-associated virus (AAV) vectors carrying shRNA against Atg7 mRNA under the Tie (tyrosine kinase) promoter to specifically inhibit endothelial autophagy. miRNA microarray, in vivo and in vitro experiments and human vascular tissues/blood vessels were used to explore the molecular mechanisms of atheroprotective effect of endothelial autophagy. Exosomes were isolated and characterized. Immunofluorescence and exosomes coculture experiments were conducted to examine the role of endothelial autophagy in regulating communication between endothelial cells (ECs) and smooth muscle cells (SMCs) via exosome.Results: Endothelial autophagy was inhibited in ECs of thoracic aortas in HFD fed ApoE-/- mice. Furthermore, rapamycin alleviated HFD-triggered atherosclerotic burden and endothelial dysfunction, while endothelial-specific depletion of Atg7 aggravated atherosclerotic burden. miRNA microarray, in vivo and in vitro experiments and human vascular tissues analysis revealed that endothelial autophagy alleviated endothelial dysfunction by downregulating miR-204-5p expression by directly targeting BCL2 to regulate apoptosis in ECs. Moreover, endothelial autophagy decreased miR-204-5p expression by loading this molecule into multivesicular bodies and secreting them out of cells via exosomes, and ECs-derived exosomal miR-204-5p could be transferred to SMCs, antagonized SMCs calcification.Conclusions: Our study first revealed that endothelial autophagy was a critical regulator of atherogenesis by transferring miR-204-5p from ECs to SMCs by exosomes, and endothelial autophagy activation by rapamycin, could alleviate AS in a “one stone hit two birds” manner.

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Exosome Mediated Delivery of miR-124 Promotes Neurogenesis after Ischemia.

Publications

Exosome Mediated Delivery of miR-124 Promotes Neurogenesis after Ischemia.

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