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• W3122091581 abstract "Background and Objective: Depression is an independent risk factor of cardiovascular disease and significantly associated with the prevalence of abdominal aortic aneurysm (AAA). We investigated the impact of repeated social defeat (RSD) on AAA formation. Methods and Results: Eight-week-old male WT mice were exposed to RSD by housing with a larger CD-1 mouse in a shared cage. They were subjected to vigorous physical contact daily for 10 consecutive days. Control mice were housed in the same cage without physical contact. After social interaction test to confirm depressive-like behaviors, mice underwent application of 0.5M calcium chloride (CaCl 2 ) on the infrarenal aorta. At one-week, maximum diameter and circumference of external elastic membrane were comparable between the two groups. The number of F-4/80 and MMP-9-positive cells in immunofluorescent images were also comparable. Consistently, fluorescent image taken by IVIS revealed no difference in MMP activity, suggesting that acute inflammatory response was comparable between the two groups. In contrast, at two weeks, maximum diameter and circumference of external elastic membrane were significantly increased in defeated mice ( p < 0.01). Intriguingly, periaortic fibrotic area in aneurysmal portion was markedly decreased in defeated mice (12.5х10 3 μm 2 vs. 3.7х10 3 μm 2 , Control vs. Defeat, p < 0.01). Consistently, accumulation of α-SMA-positive cells in adventitia of aneurysmal portion was much lesser in defeated mice (876 cells/mm 2 vs. 319 cells/mm 2 , Control vs. Defeat, p < 0.05), whereas those in tunica media of non-aneurysmal portion did not show any difference between the two groups. LPS-induced iNOS gene and protein expressions in bone marrow-derived macrophages (BMDMs) were significantly decreased in defeated mice, whereas the TGF-β-induced phosphorylation of Smad2 and ERK1/2 in primary cultured aortic VSMCs were comparable between the two groups. Conclusions: Our findings demonstrate that RSD enhances AAA expansion by suppressing the periaortic fibrosis following inflammatory response, and suggest that decreased NO production from accumulated macrophages contributes to the reduced VSMCs proliferation and collagen deposition." @default.
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• W3122091581 date "2020-11-17" @default.
• W3122091581 modified "2023-10-16" @default.
• W3122091581 title "Abstract 15501: Repeated Social Defeat Exaggerates Cacl2-induced Abdominal Aortic Aneurysm Expansion by Suppression of Periaortic Fibrosis in Tissue Repair Phase" @default.
• W3122091581 doi "https://doi.org/10.1161/circ.142.suppl_3.15501" @default.
• W3122091581 hasPublicationYear "2020" @default.
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