PubMed:15711567 JSONTXT

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The retinas of diabetic animals demonstrated elevated levels of MMP-2, MMP-9 and MMP-14 messenger RNA. A significant increase in the production of MMP-9 was seen when cells were exposed to high glucose conditions. Both cell types treated with purified MMP-2 or MMP-9 were found to have alterations of tight junction function as shown by decreased TER. Western blot analysis of cell extracts treated with MMP-2 or MMP-9, revealed specific degradation of the tight junction protein, occludin. Results suggest that elevated expression of MMPs in the retina may facilitate an increase in vascular permeability by a mechanism involving proteolytic degradation of the tight junction protein occludin followed by disruption of the overall tight junction 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