• Laboratory Medicine (Kong Fanqiang),Department of Ophtalmology (Chen Song), General Hospital of Tianjin Medical University, Tianjin 300052, China; Laboratory Medicine, The Second Hospital of Tianjin Medical University, Tianjin 300211, China (Zhou Shumin);
Chen Song, Email: chszyy248@163.com
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ObjectiveTo study how CD73 is shed from the retinal pigment epithelium (RPE) surface.MethodsCD73 shedding was induced by treating RPE with lipopolysaccharides (LPS) and TNF-α. After Phospholipase C (PLC) or pan matrix metalloproteinase (MMP) inhibitors were added, surface amount of CD73 was evaluated by flow cytometry (FACS). Then selective inhibitors or their corresponding siRNAs of MMP-2 and MMP-9 were applied to the treatments of RPE; and their effects on induced CD73 shedding were evaluated by FACS. By site directed mutagenesis, mutations were introduced to Lys547-Phe548 coding sites of CD73 cDNA, which was cloned in a pcDNA mammalian expression vector. Both wt-CD73 and mutated-CD73 were over expressed in CD73-/- RPE and their induced shedding was compared.ResultsLPS and TNF-α induced CD73 shedding from RPE was completely blocked by the addition of pan MMP inhibitor but not PLC inhibitor. Selective MPP-9, but not MMP-2, inhibitor or its siRNA blocked CD73 shedding. In CD73-/- RPE induced CD73 shedding was happened to overexpressed wt-CD73 but not Lys547-Phe548 sites mutant CD73.ConclusionMMP-9 is responsible for shedding CD73 from RPE through hydrolyzing its Lys547 -Phe548 sites.

Citation: Kong Fanqiang, Zhou Shumin, Chen Song. Matrix metalloproteinase-9 regulates the shedding of CD73 from retinal pigment epithelium. Chinese Journal of Ocular Fundus Diseases, 2017, 33(5): 518-522. doi: 10.3760/cma.j.issn.1005-1015.2017.05.018 Copy

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