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角膜上皮细胞衍生的外泌体在角膜创伤愈合和新生血管形成中的潜在作用。

Potential role of corneal epithelial cell-derived exosomes in corneal wound healing and neovascularization.

机构信息

Department of Ophthalmology and Visual Sciences, Illinois Eye and Ear Infirmary, College of Medicine, University of Illinois at Chicago, Chicago, IL, United States.

Schepens Eye Research Institute/MEE, Boston, Massachusetts, United States.

出版信息

Sci Rep. 2017 Feb 6;7:40548. doi: 10.1038/srep40548.

Abstract

Specific factors from the corneal epithelium underlying the stimulation of stromal fibrosis and myofibroblast formation in corneal wound healing have not been fully elucidated. Given that exosomes are known to transfer bioactive molecules among cells and play crucial roles in wound healing, angiogenesis, and cancer, we hypothesized that corneal epithelial cell-derived exosomes may gain access to the underlying stromal fibroblasts upon disruption of the epithelial basement membrane and that they induce signaling events essential for corneal wound healing. In the present study, exosome-like vesicles were observed between corneal epithelial cells and the stroma during wound healing after corneal epithelial debridement. These vesicles were also found in the stroma following anterior stromal keratectomy, in which surgical removal of the epithelium, basement membrane, and anterior stroma was performed. Exosomes secreted by mouse corneal epithelial cells were found to fuse to keratocytes in vitro and to induce myofibroblast transformation. In addition, epithelial cell-derived exosomes induced endothelial cell proliferation and ex vivo aortic ring sprouting. Our results indicate that epithelial cell-derived exosomes mediate communication between corneal epithelial cells and corneal keratocytes as well as vascular endothelial cells. These findings demonstrate that epithelial-derived exosomes may be involved in corneal wound healing and neovascularization, and thus, may serve as targets for potential therapeutic interventions.

摘要

角膜创伤愈合过程中,基质纤维化和肌成纤维细胞形成的刺激物的具体来源还没有完全阐明。已知细胞外囊泡能够在细胞之间传递生物活性分子,并在创伤愈合、血管生成和癌症中发挥关键作用,因此我们假设,角膜上皮细胞来源的细胞外囊泡可能在破坏上皮基底膜后进入下方的基质成纤维细胞,并诱导对角膜创伤愈合至关重要的信号事件。在本研究中,我们观察到在角膜上皮清创后的创伤愈合过程中,角膜上皮细胞和基质之间存在细胞外囊泡样小泡。在前部基质角膜切开术后也发现了这些小泡,在前部基质角膜切开术中,上皮、基底膜和前部基质被手术切除。研究发现,小鼠角膜上皮细胞分泌的细胞外囊泡能够在体外融合到角膜成纤维细胞,并诱导成纤维细胞向肌成纤维细胞转化。此外,上皮细胞来源的细胞外囊泡还能诱导内皮细胞增殖和体外主动脉环发芽。我们的研究结果表明,上皮细胞来源的细胞外囊泡介导了角膜上皮细胞与角膜成纤维细胞和血管内皮细胞之间的通讯。这些发现表明,上皮衍生的细胞外囊泡可能参与角膜创伤愈合和新生血管形成,因此可能成为潜在治疗干预的靶点。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b31/5292698/eaf449b9d163/srep40548-f1.jpg

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