Contrast enhancement in atherosclerosis development in a mouse model: in vivo results at 2 Tesla |
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Authors: | L. Chaabane N. Pellet M. C. Bourdillon C. Desbleds Mansard A. Sulaiman G. Hadour F. Thivolet-Béjui P. Roy A. Briguet P. Douek E. Canet Soulas |
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Affiliation: | (1) Laboratoire de RMN UMR CNRS 5012, UCB Lyon1-ESCPE, 69622 Villeurbanne, France;(2) EA 3740, Université UCB-Lyon1, Faculté Médecine Laennec, 69372 Lyon cedex 08, France;(3) CREATIS, CNRS UMR 5515, Radiologie, Hôpital Cardiologique, 28 Avenue Doyen Lépine, 69 500 Bron, France;(4) Department of Pathology of the Cardiovascular and Pneumology Hospital of Lyon, Hôpital Cardiologique, 28 Avenue Doyen Lépine, 69 500 Bron, France;(5) Department of biostatistics of the Hospices Civils of Lyon, Hôpital Lyon Sud, 69495 Pierre-Bénite, France |
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Abstract: | To develop an MRI method for the evaluation of contrast enhancement in early atherosclerotic plaque development in the abdominal aorta of a mouse model. Male apoE–/– mice from three groups, respectively 4 (n = 6), 8 (n = 11) and 16 (n = 4) weeks were included. Axial T1 spin echo images of the abdominal aorta were obtained above and below the renal arteries (90 m spatial resolution) before and over 1 h after the injection of a macromolecular contrast agent. Signal enhancement was measured in the vessel wall and compared to histological features. Maximal arterial wall signal enhancement was obtained from 16 to 32 min post injection. During this time, the signal-to-noise ratio increased by a factor up to 1.7 in 16 week mice and 2.7 and 2.4 in 8 and 4 weeks mice, respectively. The enhancement of the arterial wall appeared less pronounced in the oldest mice, 16 weeks old, exhibiting more advanced lesions. Using a macromolecular gadolinium agent, contrast uptake in atherogenesis varies with lesion stage and may be related to vessel-wall permeability. Dynamic contrast-enhanced MRI may be useful to evaluate the atherosclerotic plaque activity in mice. |
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Keywords: | Medial remodelling Atherosclerosis Permeability Apolipoprotein E knockout mice Magnetic resonance imaging |
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