医学
炎症
外膜
腹主动脉瘤
金属蛋白酶组织抑制剂
内科学
病理
主动脉瘤
主动脉
基质金属蛋白酶
弹性蛋白
内分泌学
心脏病学
动脉瘤
外科
作者
Mei Hu,Meganathan Ilamaran,Jiechun Zhu,Roderick MacArthur,Zamaneh Kassiri
标识
DOI:10.1016/j.yjmcc.2023.10.001
摘要
Aims Aorta exhibits regional heterogeneity (structural and functional), while different etiologies for thoracic and abdominal aortic aneurysm (TAA, AAA) are recognized. Tissue inhibitor of metalloproteinases (TIMPs) regulate vascular remodeling through different mechanisms. Region-dependent functions have been reported for TIMP3 and TIMP4 in vascular pathologies. We investigated the region-specific function of these TIMPs in development of TAA versus AAA. Methods & results TAA or AAA was induced in male and female mice lacking TIMP3 (Timp3−/−), TIMP4 (Timp4−/−) or in wildtype (WT) mice by peri-adventitial elastase application. Loss of TIMP3 exacerbated TAA and AAA severity in males and females, with a greater increase in proteinase activity, smooth muscle cell phenotypic switching post-AAA and -TAA, while increased inflammation was detected in the media post-AAA, but in the adventitia post-TAA. Timp3−/− mice showed impaired intimal barrier integrity post-AAA, but a greater adventitial vasa-vasorum branching post-TAA, which could explain the site of inflammation in AAA versus TAA. Severity of TAA and AAA in Timp4−/− mice was similar to WT mice. In vitro, Timp3 knockdown more severely compromised the permeability of human aortic EC monolayer compared to Timp4 knockdown or the control group. In aneurysmal aorta specimens from patients, TIMP3 expression decreased in the media in AAA, and in adventitial in TAA specimens, consistent with the impact of its loss in AAA versus TAA in mice. Conclusion TIMP3 loss exacerbates inflammation, adverse remodeling and aortic dilation, but triggers different patterns of remodeling in AAA versus TAA, and through different mechanisms.
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