Because TNF‐α has a key role for AAA formation (Puchenkova et al., 2022) and stimulates macrophages to produce MMP‐9 and MMP‐2 during AAA development (Xiong et al., 2009), we examined the expression of TNF‐α, MMP‐9, and MMP‐2 in the abdominal aortic wall after angiotensin II infusion for 14 days. The gene discussed is MMP9; the disease is triple-A syndrome.