Peptide-functionalized Polymers Regulating Angiogenesis and Inflammation in Peripheral Artery Disease

Abstract

Peripheral artery disease (PAD) is characterized by platelet activation and aggregation on arterial walls, resulting in vessel occlusion and ischemia. To treat PAD, it is desirable to have a high degree of angiogenesis to promote collateral blood vessel formation, with a low degree of inflammation to minimize plaque development. However, these two processes are intrinsically linked and difficult to uncouple. Therefore, the overarching goal of this research was to develop a biomaterial system that enables controlled, dual delivery of pro-angiogenic and anti-inflammatory peptides in minimally-invasive way. To achieve the goal, a peptide-loaded injectable scaffold system was developed and tested in a mouse model of PAD. In addition, the mechanism of peptide-mediated regulation of angiogenesis and inflammation was elucidated. By regulating pathways involved in inflammation and angiogenesis independently, this dual peptide-loaded injectable scaffold system may significantly improve recovery of ischemic tissues in patients with PAD.