BACKGROUND: The study of unstable atherosclerotic plaques is limited by the absence of ideal animal models to reproduce the plaque instability observed in humans. In this study, we attempted to develop a novel animal model for vulnerable atherosclerotic plaques using dehydrated ethanol lavage in rabbits fed a Western diet (WD). METHODS: A total of 30 New Zealand White (NZW) rabbits were randomized to 5 groups, including a control group with or without WD, a balloon injury with WD group, and an ethanol injury with or without WD group. Operations were conducted using the right common carotid artery as the target vessel. All animals were followed up for 3 months unless a vascular event occurred. Blood samples and carotid artery specimens were ultimately collected for analysis of atherogenesis. RESULTS: Compared to rabbits in which lesions were induced by balloon injury, those subjected to an ethanol lavage with high cholesterol diet showed progressive atherosclerotic lesions in all carotid artery segments, which were characterized by greater plaque burden, smaller minimum lumen area (MLA), and increased vulnerability as indicated by abundant macrophages, scattered smooth muscle cell (SMC) composition, higher matrix metalloproteinase-9 (MMP-9) expression in plaques, thinner fibrous cap thickness, and higher possibility of stroke event (50% vs. 0%). Meanwhile, the serum interleukin-1β (IL-1β) and monocyte chemoattractant protein-1 (MCP-1) levels in the ethanol injury group with a high-cholesterol diet were significantly higher than those in the balloon injury group after 3 months (all P<0.01). CONCLUSIONS: We successfully established a novel animal model for vulnerable atherosclerosis by ethanol exposure of the carotid segment that has a higher predictive value for the probability of ischemic events than the balloon injury model. Therefore, it may represent a promising animal model for investigating new therapeutic approaches, novel imaging modalities, and underlying mechanisms for vulnerable atherosclerotic plaque. 2021 Cardiovascular Diagnosis and Therapy. All rights reserved.
BACKGROUND: The study of unstable atherosclerotic plaques is limited by the absence of ideal animal models to reproduce the plaque instability observed in humans. In this study, we attempted to develop a novel animal model for vulnerable atherosclerotic plaques using dehydrated ethanol lavage in rabbits fed a Western diet (WD). METHODS: A total of 30 New Zealand White (NZW) rabbits were randomized to 5 groups, including a control group with or without WD, a balloon injury with WD group, and an ethanol injury with or without WD group. Operations were conducted using the right common carotid artery as the target vessel. All animals were followed up for 3 months unless a vascular event occurred. Blood samples and carotid artery specimens were ultimately collected for analysis of atherogenesis. RESULTS: Compared to rabbits in which lesions were induced by balloon injury, those subjected to an ethanol lavage with high cholesterol diet showed progressive atherosclerotic lesions in all carotid artery segments, which were characterized by greater plaque burden, smaller minimum lumen area (MLA), and increased vulnerability as indicated by abundant macrophages, scattered smooth muscle cell (SMC) composition, higher matrix metalloproteinase-9 (MMP-9) expression in plaques, thinner fibrous cap thickness, and higher possibility of stroke event (50% vs. 0%). Meanwhile, the serum interleukin-1β (IL-1β) and monocyte chemoattractant protein-1 (MCP-1) levels in the ethanol injury group with a high-cholesterol diet were significantly higher than those in the balloon injury group after 3 months (all P<0.01). CONCLUSIONS: We successfully established a novel animal model for vulnerable atherosclerosis by ethanol exposure of the carotid segment that has a higher predictive value for the probability of ischemic events than the balloon injury model. Therefore, it may represent a promising animal model for investigating new therapeutic approaches, novel imaging modalities, and underlying mechanisms for vulnerable atherosclerotic plaque. 2021 Cardiovascular Diagnosis and Therapy. All rights reserved.
Authors: R E Gerszten; E A Garcia-Zepeda; Y C Lim; M Yoshida; H A Ding; M A Gimbrone; A D Luster; F W Luscinskas; A Rosenzweig Journal: Nature Date: 1999-04-22 Impact factor: 49.962
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Authors: Peter Duewell; Hajime Kono; Katey J Rayner; Cherilyn M Sirois; Gregory Vladimer; Franz G Bauernfeind; George S Abela; Luigi Franchi; Gabriel Nuñez; Max Schnurr; Terje Espevik; Egil Lien; Katherine A Fitzgerald; Kenneth L Rock; Kathryn J Moore; Samuel D Wright; Veit Hornung; Eicke Latz Journal: Nature Date: 2010-04-29 Impact factor: 49.962
Authors: M D Rekhter; G W Hicks; D W Brammer; C W Work; J S Kim; D Gordon; J A Keiser; M J Ryan Journal: Circ Res Date: 1998-10-05 Impact factor: 17.367
Authors: Nay Min Htun; Yung Chih Chen; Bock Lim; Tara Schiller; Ghassan J Maghzal; Alex L Huang; Kirstin D Elgass; Jennifer Rivera; Hans G Schneider; Bayden R Wood; Roland Stocker; Karlheinz Peter Journal: Nat Commun Date: 2017-07-13 Impact factor: 14.919