ABSTRACT
Objective:To investigate the role of metformin (MET) in inflammatory response in abdominal aortic aneurysm(AAA) formation induced by angiotensin Ⅱ.Methods:AAA models were established by Ang Ⅱ infusion in ApoE-/-mice.Thirty male ApoE-/-mice (8-10-week-old) were randomly and equally divided into four groups:Control group,AAA group and AAA+MET group.HE staining and immunohistochemical staining were used to analyze the inflammatory response.Real-time quantitative polymerase chain reaction (qPCR) was used to analyze the mRNA expression of intercellular cell adhesion molecule-1 (ICAM-1).Western blotting was used to analyze the activation of nuclear factor κB signaling (NF-κB).Results:The AAA incidence and mean maximum suprarenal aortic diameter of AAA group is larger than the AAA+MET group.Compared with the AAA grouP,the expression of ICAM-1 and activity of NF-κB is lower in AAA+MET group.Conclusion:Metformin can attenuate AAA formation partially by regulating macrophage infiltration through regulating the mRNA expression of ICAM-1 regulated by the activation of NF-κB signaling pathway.