Human embryonic stem cell-derived extracellular vesicles alleviate retinal degeneration by upregulating Oct4 to promote retinal Müller cell retrodifferentiation via HSP90

Stem Cell Research & Therapy

Min Xue¹  Xiaoe Fan²  Rui Hao³  Xinjun Ren⁴  Lijie Dong⁴  Liangzhang Tan⁴  Xiaorong Li⁴  Yifeng Ke⁴  Chunbo Yang⁵ 

[1] Department of Ophthalmology, Anhui No.2 Provincial People’s Hospital, 230000, Hefei, Anhui, People’s Republic of China;Jincheng People’s Hospital, 048000, Jincheng, Shanxi, People’s Republic of China;Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Vision Science, Nankai University Eye Hospital, Clinical College of Ophthalmology, Tianjin Medical University, 300020, Tianjin, People’s Republic of China;Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin International Joint Research and Development Centre of Ophthalmology and Vision Science, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, No 251, Fukang Road, Nankai District, 300384, Tianjin, People’s Republic of China;Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin International Joint Research and Development Centre of Ophthalmology and Vision Science, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, No 251, Fukang Road, Nankai District, 300384, Tianjin, People’s Republic of China;Institute of Genetic Medicine, Newcastle University, Central Parkway, NE1 3 BZ, Newcastle upon Tyne, UK;

关键词: Retinal degeneration;    Retinal Müller cell;    Human embryonic stem extracellular vesicle;    Microvesicle;    HSP90;    Oct4;    Retrodifferentiation;   

DOI  :  10.1186/s13287-020-02034-6

来源: Springer

【 摘 要 】

ObjectiveRetinal degenerative diseases remain the dominant causes of blindness worldwide, and cell replacement is viewed as a promising therapeutic direction. However, the resources of seed cells are hard to obtain. To further explore this therapeutic approach, human embryonic stem extracellular vesicles (hESEVs) were extracted from human embryonic stem cells (hESCs) to inspect its effect and the possible mechanism on retinal Müller cells and retinal function.MethodshESEVs were extracted by multi-step differential centrifugation, whose morphologies and specific biomarkers (TSG101, CD9, CD63, and CD81) were observed and measured. After hESEVs were injected into the vitreous cavity of RCS rats, the retinal tissues and retinal functions of rats were assessed. The alteration of Müller cells and retinal progenitor cells was also recorded. Microvesicles (MVs) or exosomes (EXOs) were extracted from hESCs transfected with sh-HSP90 or pcDNA3.1-HSP9, and then incubated with Müller cells to measure the uptake of EVs, MVs, or EXOs in Müller cells by immunofluorescence. The retrodifferentiation of Müller cells was determined by measuring Vimentin and CHX10. qRT-PCR and western blot were used to detect HSP90 expression in MVs and evaluate Oct4 level in Müller cells, and Co-IP to inspect the interaction of HSP90 and Oct4.ResultsRCS rats at the postnatal 30 days had increased retinal progenitor cells which were dedifferentiated from Müller cells. hESEVs were successfully extracted from hESCs, evidenced by morphology observation and positive expressions of specific biomarkers (TSG101, CD9, CD63, and CD81). hESEVs promoted Müller cells dedifferentiated and retrodifferentiated into retinal progenitor cells evidenced by the existence of a large amount of CHX10-positive cells in the retinal inner layer of RCS rats in response to hESEV injection. The promotive role of hESEVs was exerted by MVs demonstrated by elevated fluorescence intensity of CHX10 and suppressed Vimentin fluorescence intensity in MVs rather than in EXOs. HSP90 in MVs inhibited the retrodifferentiation of Müller cells and suppressed the expression level of Oct4 in Müller cells. Co-IP revealed that HSP90 can target Oct4 in Müller cells.ConclusionhESEVs could promote the retrodifferentiation of Müller cells into retinal progenitor cells by regulating the expression of Oct4 in Müller cells by HSP90 mediation in MVs.

【 授权许可】

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