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Matrix metalloproteinases (MMPs), also termed matrixins, are known to affect atherosclerosis in many diverse ways.1–3 Apart from a role in the progression of atherosclerotic lesions, MMPs have also been involved in plaque destabilization and rupture and in the development of aneurysms. Despite intense research efforts during the last decade, it has been challenging to formulate a unifying model on the specific role of MMPs in atherosclerosis. In fact, mouse genetic studies have yielded controversial insights, highly dependent on genetic background, dietary regimen, and arterial site of analysis, whereas human genetic association studies do not prove causality of MMPs in atherosclerosis. Moreover, the lack of specific inhibitors precluded pharmacological dissection of the role of MMPs in vivo. There is thus a need for alternative strategies to decipher the MMP puzzle in atherosclerosis. In this issue of Circulation , Liang et al4 used a novel approach: They generated transgenic rabbits to study the role of MMP-12, also known as macrophage elastase, in atherosclerosis. Their results indicate that MMP-12 causes media destruction and pseudoaneurysm formation and, more surprisingly, accelerates plaque growth in an animal model that more closely resembles atherosclerosis in humans.Article p 1993 MMPs belong to one of the most ancient families of enzymes that arose in evolution soon after the first signs of life to regulate, in general, interactions of cells with the extracellular matrix (ECM). To cope with this formidable challenge, more than 65 structurally related MMPs developed in bacteria, plants, nematodes, fruit flies, sea urchins, and vertebrates. One of their key activities is breaking down ECM substrates in the basement membrane and interstitial matrix.1,2 As such, MMPs facilitate migration of macrophages and smooth muscle cells (SMCs) in atherosclerotic plaques by degrading ECM barriers, exposing novel ECM adhesion sites, and relieving the binding between basement membrane …

Novel Transgenic Rabbit Model Sheds Light on the Puzzling Role of Matrix Metalloproteinase-12 in Atherosclerosis