Determination of atherogenesis in apolipoprotein E-knockout mice

Area of Science:

• Cardiovascular Research
• Animal Models of Disease
• Atherosclerosis Research

Background:

• Genetically-modified mice, particularly apolipoprotein E-knockout (apoE-/-) mice, are crucial models for studying atherogenesis.
• Conventional methods for assessing lesion size and composition can lack accuracy, especially for small lesions.

Purpose of the Study:

• To provide a detailed characterization of atherosclerotic lesion components in apoE-/- mice.
• To establish a computer-assisted quantitative method for determining atherogenesis in apoE-/- mice.

Main Methods:

• Atherosclerotic lesion detection at characteristic sites in the aorta of apoE-/- and wild-type mice.
• Quantitative assessment of lesion coverage on the aortic surface.
• Immunocytochemistry to detect oxidation-specific epitopes in aortic tissue.

Main Results:

• Significant differences in lesion prevalence: 20% aortic surface coverage in apoE-/- mice versus 1% in wild-type C57BL/6 mice (p < 0.00001).
• Presence of oxidation-specific epitopes, indicative of oxidized LDL, confirmed in the aortas of apoE-/- mice.

Conclusions:

• The apoE-/- mouse model is suitable for investigating factors influencing atherogenesis, including lipid metabolism, oxidation, and vascular cell involvement.
• This model can be used to explore the potential of antioxidants and gene therapy in mitigating atherosclerosis.
• While mouse models have limitations for direct human extrapolation, they offer valuable insights into disease mechanisms.