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Glucose-enriched medium enhances cell-mediated low density lipoprotein peroxidation
C Mazière1, M Auclair, F Rose-Robert
1Laboratoire de Chimie-Biologique, Faculté de Médecine Saint-Antoine, Paris, France.
FEBS Letters
|April 24, 1995
Summary
High glucose levels enhance endothelial and smooth muscle cells' ability to oxidize low-density lipoprotein (LDL). This process, linked to increased superoxide anion secretion, may contribute to atherosclerotic lesions in diabetes.
Area of Science:
- Biochemistry
- Cell Biology
- Cardiovascular Research
Background:
- Diabetes mellitus is associated with an increased risk of atherosclerotic lesions.
- Oxidative modification of low-density lipoprotein (LDL) plays a crucial role in atherogenesis.
Purpose of the Study:
- To investigate the effect of high glucose concentrations on LDL oxidative modification induced by endothelial and smooth muscle cells.
- To explore the potential mechanisms linking hyperglycemia to enhanced LDL oxidation.
Main Methods:
- Endothelial and smooth muscle cells were precultured in glucose-enriched media (11.2–44.8 mM) for one week.
- LDL oxidation was assessed by measuring lipid peroxidation end products, conjugated diene content, relative electrophoretic mobility, and macrophage degradation.
- Superoxide anion secretion by cells was quantified.
Main Results:
- Preculture in high glucose significantly enhanced the oxidative modification of LDL by both cell types.
- This enhancement correlated with a marked stimulation of superoxide anion secretion from the cells.
- Elevated glucose levels increased LDL's susceptibility to oxidation and subsequent degradation by macrophages.
Conclusions:
- Hyperglycemia can promote LDL oxidative modification through enhanced superoxide anion production by vascular cells.
- This cell-induced LDL oxidation under high glucose conditions may be a key factor in the development of atherosclerotic lesions in diabetes mellitus.