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Eyes with age-related macular degeneration (AMD) demonstrate accumulation of specific deposits and extracellular matrix (ECM) molecules under the retinal pigment epithelium (RPE). Metalloproteinases (MMP) are crucial regulators of basement membrane and ECM turnover. Accordingly, loss of RPE MMP activity most likely leads to excessive accumulation of collagen and other ECM, a potential mechanism for formation of deposits. A prior study showed that MMP-2 activity, but not pro-MMP-2 protein, decreases after RPE oxidative injury, indicating that oxidant injury disrupts the enzymatic cleavage of pro-MMP-2. Activation of MMP-2 requires the formation of a tri-molecular complex of pro-MMP-2, MMP-14, and tissue inhibitor of metalloproteinases (TIMP)-2. Therefore, a study was conducted to investigate the impact of oxidant injury on the interaction between these three molecules.

Retinal Pigment Epithelium Protection from Oxidant-Mediated Loss of MMP-2 Activation Requires Both MMP-14 and TIMP-2