[No authors listed]
The metalloproteinase, pregnancy-associated plasma protein-A (PAPP-A), has been implicated in the development of cardiovascular disease in humans and mouse models. In the latter, genetic deletion or overexpression of PAPP-A confirmed a major role for PAPP-A in atherosclerosis. In this study, we tested the hypothesis that targeting PAPP-A proteolytic activity by an inhibitory monoclonal antibody (mAb-PA) reduces atherosclerotic plaque progression. Apolipoprotein E knock-out mice on high-fat diet were treated with mAb-PA or isotype control. Control mice had a 10-fold increase in aortic plaque after 10Â weeks. Aortic plaque burden was reduced by â¼70Â % in mice treated with mAb-PA (Pâ=â0.0002). Treatment was efficacious even in the face of elevated cholesterol and triglycerides. This study demonstrates proof-of-principle and provides feasibility for a novel therapeutic strategy to inhibit atherosclerotic plaque burden by selective targeting of PAPP-A.
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