TREM-1 orchestrates angiotensin II-induced monocyte trafficking and promotes experimental abdominal aortic aneurysm

Marie Vandestienne, Yujiao Zhang, Icia Santos-Zas, Rida Al-Rifai, Jeremie Joffre, Andreas Giraud, Ludivine Laurans, Bruno Esposito, Florence Pinet, Patrick Bruneval, Juliette Raffort, Fabien Lareyre, Jose Vilar, Amir Boufenzer, Lea Guyonnet, Coralie Guerin, Eric Clauser, Jean Sébastien Silvestre, Sylvie Lang, Laurie Soulat-DufourAlain Tedgui, Ziad Mallat, Soraya Taleb, Alexandre Boissonnas, Marc Derive, Giulia Chinetti, Hafid Ait-Oufella*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

36 Citations (Scopus)


The triggering receptor expressed on myeloid cells 1 (TREM-1) drives inflammatory responses in several cardiovascular diseases but its role in abdominal aortic aneurysm (AAA) remains unknown. Our objective was to explore the role of TREM-1 in a mouse model of angiotensin II-induced (AngII-induced) AAA. TREM-1 expression was detected in mouse aortic aneurysm and colocalized with macrophages. Trem1 gene deletion (Apoe-/-Trem1-/-), as well as TREM-1 pharmacological blockade with LR-12 peptide, limited both AAA development and severity. Trem1 gene deletion attenuated the inflammatory response in the aorta, with a reduction of Il1b, Tnfa, Mmp2, and Mmp9 mRNA expression, and led to a decreased macrophage content due to a reduction of Ly6Chi classical monocyte trafficking. Conversely, antibody-mediated TREM-1 stimulation exacerbated Ly6Chi monocyte aorta infiltration after AngII infusion through CD62L upregulation and promoted proinflammatory signature in the aorta, resulting in worsening AAA severity. AngII infusion stimulated TREM-1 expression and activation on Ly6Chi monocytes through AngII receptor type I (AT1R). In human AAA, TREM-1 was detected and TREM1 mRNA expression correlated with SELL mRNA expression. Finally, circulating levels of sTREM-1 were increased in patients with AAA when compared with patients without AAA. In conclusion, TREM-1 is involved in AAA pathophysiology and may represent a promising therapeutic target in humans.

Original languageEnglish
Article numbere142468
JournalJournal of Clinical Investigation
Issue number2
Publication statusPublished - 19 Jan 2021


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