Abstract | Purpose: It was previously demonstrated that opticin (OPTC) inhibits the collagen-induced promotion of bioactivities of human retinal vascular endothelial cells (hRVECs). The present in vivo study aimed to further investigate the regulatory role of opticin in vitreous collagen-mediated retinal neovascularization and to elucidate its regulatory mechanisms with regard to integrin α2-I domain-GXXGER complex formation and RhoA/ROCK1 signal change. The regulatory role of Mg2+ on integrin α2-I domain-GXXGER complex formation in the above process was also investigated. Methods: The zebrafish model of hypoxia-induced retinopathy was established, and OPTC-overexpressing plasmids were intravitreally injected to assess the antiangiogenesis effect of opticin. The regulatory role of opticin in integrin α2-I domain-GXXGER complex formation in vivo was analyzed by mass spectrometry. The mRNA and protein expression of RhoA/ROCK1 were examined. The concentration of Mg2+ as an activator of the integrin α2-I domain-GXXGER complex was measured. Solid-phase binding assays were performed to investigate the interference of opticin in integrin α2 collagen binding and the regulatory role of Mg2+ in that process. Results: Opticin and OPTC-overexpressing plasmid injection reduced retinal neovascularization in the zebrafish model of hypoxia-induced retinopathy. Mass spectrometry revealed that opticin could inhibit integrin α2-I domain-GXXGER complex formation. The Mg2+ concentration was also decreased by opticin, which was another indication of the complex activation. Injection of OPTC-overexpressing plasmids inhibited mRNA and the protein expression of RhoA/ROCK1 in the zebrafish model of hypoxia-induced retinopathy. The solid-phase binding assay revealed that opticin could block integrin α2-collagen I binding in the presence of Mg2+. Conclusions:
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Authors | Xiaoxue Liu, Yue Xing, Xin Liu, Lingyan Zeng, Jin Ma |
Journal | Investigative ophthalmology & visual science
(Invest Ophthalmol Vis Sci)
Vol. 63
Issue 1
Pg. 13
(01 03 2022)
ISSN: 1552-5783 [Electronic] United States |
PMID | 35006271
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Integrin alpha2
- Proteoglycans
- Zebrafish Proteins
- optc protein, zebrafish
- RNA
- ROCK1 protein, human
- rho-Associated Kinases
- Monomeric GTP-Binding Proteins
- rhoab protein, zebrafish
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Topics |
- Animals
- Disease Models, Animal
- Gene Expression Regulation
- Integrin alpha2
(biosynthesis, genetics)
- Monomeric GTP-Binding Proteins
(biosynthesis, genetics)
- Proteoglycans
(biosynthesis, genetics)
- RNA
(genetics)
- Retinal Neovascularization
(genetics, metabolism, pathology)
- Signal Transduction
- Zebrafish
- Zebrafish Proteins
(biosynthesis, genetics)
- rho-Associated Kinases
(biosynthesis, genetics)
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