Abstract:
AIM:Angiotensin (Ang) II-induced abdominal aortic aneurysm (AAA) in apoE-deficient mice has been used as a model of human AAA, but it has been unclear why the progression of AAA continues after stopping the Ang II infusion. The involvement of vascular Ang II-forming enzymes in the progression of AAA was studied. METHODS:ApoE-deficient mice were infused with Ang II (1,000 ng/kg/min) for 4 weeks and evaluated until 20 weeks after the Ang II infusion. Just after and 20 weeks after stopping the Ang II infusion, the degree of AAA, as well as the ACE and chymase activities, was evaluated. An Ang II receptor blocker (candesartan, 30 mg/kg/day) and an angiotensin-converting enzyme (ACE) inhibitor (lisinopril, 60 mg/kg/day) were given for 20 weeks after stopping the Ang II infusion. RESULTS:The aortic diameter expanded just after stopping the Ang II infusion and progressed for a further 20 weeks after the infusion was stopped. Just after stopping the infusion, aortic ACE and chymase activities were significantly increased, but only the increase in chymase activity continued until 20 weeks after the infusion was stopped. Candesartan and lisinopril significantly attenuated aortic diameter expansion. CONCLUSION:The increases in vascular Ang II-forming activities were involved in the progression of AAA after stopping the Ang II infusion.
journal_name
J Atheroscler Thrombjournal_title
Journal of atherosclerosis and thrombosisauthors
Inoue N,Muramatsu M,Jin D,Takai S,Hayashi T,Katayama H,Kitaura Y,Tamai H,Miyazaki Mdoi
10.5551/jat.e611subject
Has Abstractpub_date
2009-06-01 00:00:00pages
164-71issue
3eissn
1340-3478issn
1880-3873pii
JST.JSTAGE/jat/E611journal_volume
16pub_type
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journal_title:Journal of atherosclerosis and thrombosis
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journal_title:Journal of atherosclerosis and thrombosis
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journal_title:Journal of atherosclerosis and thrombosis
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journal_title:Journal of atherosclerosis and thrombosis
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journal_title:Journal of atherosclerosis and thrombosis
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journal_title:Journal of atherosclerosis and thrombosis
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