Inhibitory interferon regulatory factor 5 binding peptide suppresses abdominal aortic aneurysm expansion in vivo.

Abdominal aortic aneurysm (AAA) is a critical condition characterized by the expansion of the infrarenal aorta, often leading to high mortality upon rupture. The absence of treatment for asymptomatic AAAs urgently necessitates uncovering the underlying mechanisms of their development. This study utilized mice to induce AAA through porcine pancreatic elastase with BAPN feeding and found that mice receiving the IRF5-binding peptide (IBP) demonstrated significantly slowed AAA expansion and reduced adventitia degradation compared to the control group. Additionally, the IBP group showed decreased macrophage infiltration and reduced matrix metalloproteinase-9 (MMP9) activity. Targeting IRF5 with IBP offers new avenues for potential treatments for asymptomatic AAAs.