In:
Disease Models & Mechanisms, The Company of Biologists, ( 2015-01-01)
Abstract:
Myocardial infarction and stroke are frequent after surgical procedures and consume a considerable amount of benefit of surgical therapy. Perioperative stress, induced by surgery, is composed of hemodynamic and inflammatory reactions. The effects of perioperative stress on atherosclerotic plaques are ill-defined. Murine models to investigate the influence of perioperative stress on plaque stability and rupture are not available. We developed a model to investigate the influence of perioperative stress on plaque growth and stability by exposing apolipoprotein E-deficient mice, fed a high cholesterol diet for 7 weeks, to a double hit consisting of 30 minutes of laparotomy combined with a substantial blood loss (20% body weight; 400µl). The innominate artery was harvested 72 hours after the intervention. Control groups were sham and baseline controls. Interleukin-6 (IL-6) and Serum Amyloid A plasma levels were determined. Plaque load VSMC- and macrophage-content were quantified. Plaque stability was assessed using the Stary score and frequency of signs of plaque rupture. High-dose atorvastatin (80 mg/kg body weight/day) was administered for 6 days starting 3 days prior to double hit. A single dose of an IL-6-neutralizing antibody or the fusion protein sgp130-Fc selectively targeting IL-6 trans-signaling was subcutaneously injected. IL-6 plasma levels increased peaking at 6h after the intervention. SAA levels peaked at 24 hours (n=4, p & lt;0.01). Plaque volume increased significantly with the double hit compared to sham (n=8, p & lt;0.01). More plaques were scored as complex or bearing signs of rupture after the double hit compared to sham (n=5-8, p & lt;0.05). Relative VSMC and macrophage content remained unchanged. IL-6-inhibition or atorvastatin, but not blocking of IL-6 trans-signaling, significantly decreased plaque volume and complexity (n=8, p & lt;0.01), Using this model, researchers will be able to further investigate the pathophysiology of perioperative plaque stability, which can result in myocardial infarction, and additionally, to test potential protective strategies.
Type of Medium:
Online Resource
ISSN:
1754-8411
,
1754-8403
Language:
English
Publisher:
The Company of Biologists
Publication Date:
2015
detail.hit.zdb_id:
2451104-3
Permalink