Journal of Atherosclerosis and Thrombosis
Online ISSN : 1880-3873
Print ISSN : 1340-3478
Original Article
Absence of Microbiota (Germ-Free Conditions) Accelerates the Atherosclerosis in ApoE-Deficient Mice Fed Standard Low Cholesterol Diet
Renata StepankovaZbynek TonarJirina BartovaLukas NedorostPavel RossmanRudolf PoledneMartin SchwarzerHelena Tlaskalova-Hogenova
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2010 Volume 17 Issue 8 Pages 796-804

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Abstract

Aim: The aim of our work was to determine the influence of intestinal bacteria on the development of atherosclerotic lesions using apolipoprotein E (ApoE)-deficient knockout mice.
Methods: The experiments were performed on ApoE-/--deficient mouse strain C57BL/6, bred under germ-free (GF) conditions for two generations or under conventional conditions with defined microflora (CV). The mice were fed a standard low cholesterol diet or cholesterol-rich diet for 3-4 months. We studied the development of advanced lesions in the thoracic and abdominal aorta by histological, morphometric and immunohistological methods.
Results: Conventionally reared ApoE-/- mice (containing no pathogenic intestinal microbiota) and fed a standard low cholesterol diet in contrast to a high cholesterol diet did not develop atherosclerotic aortic plaques. In contrast, ApoE-/- mice reared under germfree conditions for 2 generations and fed a low cholesterol diet exhibited atherosclerotic plaques in the aorta. Characteristic lipid deposition with foam cells and macrophages was found in their arterial walls.
Conclusion: In contrast to the absence of atherosclerotic plaques in conventionally reared ApoE-deficient mice, germ-free ApoE-/- mice consuming the same low cholesterol standard diet developed atherosclerotic plaques in the aorta. Differences in atherosclerotic plaques between GF and CV ApoE-/- mice are not so apparent when mice are fed a high cholesterol diet. Our findings thus document the protective effect of microbiota (commensal bacteria) on atherosclerosis development.

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