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GLP-1 receptor agonists (GLP-1RA) are common clinical agents that are clinically protective against diabetic complications, such as diabetic retinopathy (DR). Previous studies have shown that the RhoA\/ROCK pathway plays an important role in the development of DR. However, the specific mechanism of action between GLP-1RA and DR remains unclear. The aim of this study was thus to investigate the main mechanism involved in the protective effect of GLP-1RA on DR. Methods. Type 2 diabetic mice were fed a high-sugar, high-fat diet. Changes in the retinal structure were observed via HE staining and transmission electron microscopy. The expression of retinal GLP-1R, blood-retinal barrier- (BRB-) related proteins, inflammatory factors, and related pathway proteins were studied via Western blot or immunohistochemistry\/immunofluorescence analysis. Results. GLP-1RA treatment reduced the blood glucose and lipid levels as well as the body weight of the diabetic mice while also improving retinal thickness, morphology, and vascular ultrastructure. Moreover, restored GLP-1R expression, increased Occludin and ZO-1 levels, and decreased albumin expression led to reduced retinal leakage and improved the BRB by inhibiting the RhoA\/ROCK pathway. Conclusions. We found that the protective effect of GLP-1RA on the retina may be realized through the GLP-1R-ROCK-p-MLC signaling pathway.<\/jats:p>","DOI":"10.1155\/2022\/1861940","type":"journal-article","created":{"date-parts":[[2022,11,4]],"date-time":"2022-11-04T05:50:15Z","timestamp":1667541015000},"page":"1-14","source":"Crossref","is-referenced-by-count":38,"title":["GLP-1 RA Improves Diabetic Retinopathy by Protecting the Blood-Retinal Barrier through GLP-1R-ROCK-p-MLC Signaling Pathway"],"prefix":"10.1155","volume":"2022","author":[{"given":"Liufeng","family":"Wei","sequence":"first","affiliation":[{"name":"Department of Laboratory, The First Affiliated Hospital of Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021 Guangxi, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiwei","family":"Mo","sequence":"additional","affiliation":[{"name":"Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong 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