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Local hydrogel release of recombinant TIMP-3 attenuates adverse left ventricular remodeling after experimental myocardial infarction. | LitMetric
An imbalance between matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs) contributes to the left ventricle (LV) remodeling that occurs after myocardial infarction (MI). However, translation of these observations into a clinically relevant, therapeutic strategy remains to be established. The present study investigated targeted TIMP augmentation through regional injection of a degradable hyaluronic acid hydrogel containing recombinant TIMP-3 (rTIMP-3) in a large animal model. MI was induced in pigs by coronary ligation. Animals were then randomized to receive targeted hydrogel/rTIMP-3, hydrogel alone, or saline injection and followed for 14 days. Instrumented pigs with no MI induction served as referent controls. Multimodal imaging (fluoroscopy/echocardiography/magnetic resonance imaging) revealed that LV ejection fraction was improved, LV dilation was reduced, and MI expansion was attenuated in the animals treated with rTIMP-3 compared to all other controls. A marked reduction in proinflammatory cytokines and increased smooth muscle actin content indicative of myofibroblast proliferation occurred in the MI region with hydrogel/rTIMP-3 injections. These results provide the first proof of concept that regional sustained delivery of an MMP inhibitor can effectively interrupt adverse post-MI remodeling.
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