The authors regret an error was made in the generation of Fig. 7A. The image showing MMP-9 staining (red signal) for the 5 mmol/L glucose condition was not correct. The corrected figure is shown below and demonstrates an increased localization of MMP-9 in the mitochondria under the 20 mmol/L glucose condition compared with cells placed in 5 mmol/L glucose. This finding is supported by increased MMP-9 activity in the mitochondria of retinal endothelial cells in 20 mmol/L glucose (Fig. 7B and C), and in the retina of diabetic mice (Fig. 2A and B) and of human donors with diabetic retinopathy (Fig. 6A).
The online version of the article (https://doi.org/10.2337/db11-0816) has been updated with the revised figure.