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• W2171052279 abstract "The progression of abdominal aortic aneurysm (AAA) involves a sustained influx of proinflammatory macrophages, which exacerbate tissue injury by releasing cytokines, chemokines, and matrix metalloproteinases. Previously, we showed that Notch deficiency reduces the development of AAA in the angiotensin II-induced mouse model by preventing infiltration of macrophages. Here, we examined whether Notch inhibition in this mouse model prevents progression of small AAA and whether these effects are associated with altered macrophage differentiation.Treatment with pharmacological Notch inhibitor (DAPT [N-(N-[3,5-difluorophenacetyl]-L-alanyl)-S-phenylglycine t-butyl ester]) at day 3 or 8 of angiotensin II infusion arrested the progression of AAA in Apoe(-/-) mice, as demonstrated by a decreased luminal diameter and aortic width. The abdominal aortas of Apoe(-/-) mice treated with DAPT showed decreased expression of matrix metalloproteinases and presence of elastin precursors including tropoelastin and hyaluronic acid. Marginal adventitial thickening observed in the aorta of DAPT-treated Apoe(-/-) mice was not associated with increased macrophage content, as observed in the mice treated with angiotensin II alone. Instead, DAPT-treated abdominal aortas showed increased expression of Cd206-positive M2 macrophages and decreased expression of Il12-positive M1 macrophages. Notch1 deficiency promoted M2 differentiation of macrophages by upregulating transforming growth factor β2 in bone marrow-derived macrophages at basal levels and in response to IL4. Protein expression of transforming growth factor β2 and its downstream effector pSmad2 also increased in DAPT-treated Apoe(-/-) mice, indicating a potential link between Notch and transforming growth factor β2 signaling in the M2 differentiation of macrophages.Pharmacological inhibitor of Notch signaling prevents the progression of AAA by macrophage differentiation-dependent mechanisms. The study also provides insights for novel therapeutic strategies to prevent the progression of small AAA." @default.
• W2171052279 created "2016-06-24" @default.
• W2171052279 creator A5024379195 @default.
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• W2171052279 creator A5045672589 @default.
• W2171052279 creator A5070040757 @default.
• W2171052279 creator A5084060067 @default.
• W2171052279 date "2014-12-17" @default.
• W2171052279 modified "2023-10-11" @default.
• W2171052279 title "Pharmacological Inhibitor of Notch Signaling Stabilizes the Progression of Small Abdominal Aortic Aneurysm in a Mouse Model" @default.
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• W2171052279 doi "https://doi.org/10.1161/jaha.114.001064" @default.
• W2171052279 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4338693" @default.
• W2171052279 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25349182" @default.
• W2171052279 hasPublicationYear "2014" @default.
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