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Why is glycated LDL more sensitive to oxidation than native LDL? A comparative study
G Sobal1, J Menzel, H Sinzinger
1Department of Nuclear Medicine, Institut of Immunology, Austria.
Prostaglandins, Leukotrienes, and Essential Fatty Acids
|October 26, 2000
Summary
Glycation significantly increases low-density lipoprotein (LDL) oxidation, a key factor in atherosclerosis. Glucose 6-phosphate is a potent glycation agent, leading to more oxidized LDL and advanced glycation end products (AGEs).
Area of Science:
- Biochemistry
- Cardiovascular Research
- Oxidative Stress
Background:
- Oxidative modification of low-density lipoprotein (LDL) is crucial in atherogenesis.
- Atherosclerosis risk is elevated in diabetic patients, where LDL glycation is common.
Purpose of the Study:
- To investigate how different agents influence LDL glycation and oxidation.
- To assess the time-dependent glycation process and its impact on LDL electrophoretic mobility.
Main Methods:
- LDL was glycated using glucose and glucose 6-phosphate, with and without EDTA and BHT.
- Oxidation was measured by thiobarbituric acid reactive substances (TBARS) for malondialdehyde (MDA) levels.
- Glycation extent was quantified by advanced glycation end products (AGEs) fluorescence.
Main Results:
- Glycated LDL exhibited significantly higher susceptibility to oxidation compared to native LDL.
- Glucose 6-phosphate was the most potent glycation agent, generating substantial AGEs.
- Lower glycation rates correlated with lower additional oxidation rates post-glycation.
Conclusions:
- Both glycation and oxidation modify LDL, increasing its atherogenic potential.
- Glycation enhances LDL's susceptibility to oxidation, particularly in diabetic conditions.
- Modified LDL shows altered electrophoretic mobility, indicating structural changes.