Role of the renin-angiotensin system in the development of abdominal aortic aneurysms in animals and humans

Alan Daugherty, Debra L. Rateri, Lisa A. Cassis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

50 Scopus citations


The mediators for the initiation, progression, and rupture of abdominal aortic aneurysms (AAAs) have not been defined. Recent evidence has demonstrated that chronic infusion of angiotensin II via subcutaneously placed osmotic pumps can reproducibly form AAAs in mice. The evolution of AngII-induced AAAs in these mice is complex. Rapid medial macrophage accumulation precedes transmedial breaks and large lumen expansion, which are restricted to the suprarenal aorta. After this initial phase, there is a more gradual rate of lumen expansion that is progressive with continued AngII exposure. There is extensive aortic remodeling during this gradual expansion phase.An initial prominent thrombus gradually resolves and is replaced by fibrous tissue containing several types of inflammatory cells. At prolonged intervals of AngII infusion, internal aortic diameters of the suprarenal aorta can increase up to fourfold compared to the same region in saline-infused mice. The extrapolation of these data in mice to the development of human AAAs remains to be determined. However, there are a considerable number of drugs available to potentially test the efficacy of inhibiting the reninangiotensin system on the progression of the human disease.

Original languageEnglish
Title of host publicationThe Abdominal Aortic Aneurysm
Subtitle of host publicationGenetics, Pathophysiology, and Molecular Biology
Number of pages10
StatePublished - Nov 2006

Publication series

NameAnnals of the New York Academy of Sciences
ISSN (Print)0077-8923
ISSN (Electronic)1749-6632


  • Angiotensin
  • Animal models
  • Aortic aneurysms

ASJC Scopus subject areas

  • General Neuroscience
  • General Biochemistry, Genetics and Molecular Biology
  • History and Philosophy of Science


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