Dynamic observation of mechanically-injured mouse femoral artery reveals an antiinflammatory effect of renin inhibitor - PubMed
Comparative Study
. 2009 Nov;29(11):1858-63.
doi: 10.1161/ATVBAHA.108.182519. Epub 2009 Sep 24.
Affiliations
- PMID: 19778947
- DOI: 10.1161/ATVBAHA.108.182519
Comparative Study
Dynamic observation of mechanically-injured mouse femoral artery reveals an antiinflammatory effect of renin inhibitor
Jun Ino et al. Arterioscler Thromb Vasc Biol. 2009 Nov.
Abstract
Objective: The renin-angiotensin-aldosterone system (RAS) plays a central role in atherosclerosis. To investigate the effects of a direct renin inhibitor aliskiren on vascular inflammation, we conducted leukocyte adhesion assays in vivo and in vitro using a novel real-time imaging system.
Methods and results: Aliskiren (10 mg/kg/d) or PBS was administered to C57BL/6 mice (6-7 weeks of age; Oriental Yeast, Tokyo, Japan) for 2 weeks via an osmotic pump. Blood pressure was not significantly changed in the 2 groups throughout the experimental period. A perivascular cuff injury was then introduced to the femoral artery and real-time intravital microscopic observation was conducted 24 hours after injury. The number of adherent leukocytes was elevated in the injured mice without aliskiren (43.8+/-9.3/10(-2) mm(2)), whereas that was significantly reduced in the mice with aliskiren (18.4+/-4.4, P<0.05). Treatment of human umbilical vein endothelial cells (HUVECs) with aliskiren significantly reduced the adhesion of THP-1 cells to TNF-alpha-activated HUVECs (P<0.05). Interestingly, TNF-alpha-induced renin activity and angiotensin II production in HUVECs were also blunted by aliskiren. Furthermore, exogenous renin and angiotensin II abrogated the aliskiren-mediated reduction of THP-1 cell adhesion to HUVECs.
Conclusions: Our in vivo and in vitro findings indicate a pivotal role for renin inhibition in vascular inflammation independent of blood pressure.
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