Quercetin Promotes Abdominal Aortic Aneurysm Regression Through the RAGE/PI3K/AKT/mTOR Axis

Objective: Abdominal aortic aneurysms (AAA) are a common critical cardiovascular disease with high morbidity and mortality rates. Quercetin, a flavonoid and a traditional Chinese medicinal ingredient commonly found in vegetables and fruits, has a favorable inhibitory effect on experimental aneurysms without side effects. This study aimed to model elastase AAA and investigate the mechanism of action of quercetin in alleviating AAA. Methods: Quercetin was administered at a dose of 60 mg/kg once daily starting on the day of AAA induction for 5 weeks. The therapeutic effect of quercetin on AAA was demonstrated using biochemical assays, observation of pathological tissue sections, Elastic Van Gieson staining, immunohistochemistry, molecular docking simulations, and Western blot protein validation. Results: Our study showed that quercetin treatment significantly alleviated abdominal aortic vessel wall dilatation, elastin degradation and adhesion to surrounding tissues caused by elastase. Additionally, quercetin significantly inhibited the mRNA and protein expression of the receptor for advanced glycation end products(RAGE)/ phosphatidylinositol 3-kinase (PI3K)/ phosphatidylinositol 3-kinase (AKT) / mammlian target of rapamycin (mTOR) pathway. Conclusion: Quercetin can alleviate abdominal aortic injury caused by elastase via RAGE/PI3K/AKT/mTOR and provide experience in clinical use.