Lipoproteins in normal and atherosclerotic aorta
S Ylä-Herttuala1, W Palinski, M E Rosenfeld
1Department of Medicine, University of California, San Diego, La Jolla 92093-0613.
European Heart Journal
|August 1, 1990
Summary
Researchers evaluated methods for isolating intimal lipoproteins. Low-density lipoprotein (LDL) from atherosclerotic lesions appears similar to oxidatively modified LDL, impacting macrophage activity.
Area of Science:
- Biochemistry
- Cardiovascular Biology
- Lipid Metabolism
Background:
- Lipoprotein analysis is crucial for understanding atherosclerosis.
- Different extraction methods yield varying results for intimal lipoproteins.
- Intimal lipoproteins play a role in macrophage cholesterol metabolism.
Purpose of the Study:
- To evaluate diverse methods for isolating intimal lipoproteins.
- To compare lipoproteins from normal intima versus atherosclerotic lesions.
- To investigate the characteristics and modifications of intimal lipoproteins.
Main Methods:
- Comparative analysis of various lipoprotein extraction and isolation techniques.
- Biochemical characterization of intimal lipoproteins, including apolipoprotein analysis.
- Assessment of lipoprotein-induced cholesterol esterification in macrophages.
- Identification of oxidative modification markers in isolated lipoproteins.
Main Results:
- Normal intima contains remnant-like and LDL-like particles stimulating macrophage cholesterol esterification.
- These normal intimal particles contain apolipoprotein E without clear oxidative modification.
- LDL-like particles from atherosclerotic lesions exhibit oxidative modification markers (malondialdehyde- and 4-hydroxynonenal-lysine adducts in apo B).
- Lesion-derived LDL-like particles are chemotactic for monocytes and undergo increased degradation in macrophages.
Conclusions:
- At least a portion of LDL isolated from atherosclerotic lesions is similar or identical to oxidatively modified LDL.
- Oxidative modification of LDL in atherosclerotic lesions may contribute to lesion progression.
- Understanding intimal lipoprotein modifications is key to developing targeted therapies for atherosclerosis.
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