Glucose promotes membrane cholesterol crystalline domain formation by lipid peroxidation
| Autor: | Yehudi Self-Medlin, Yoshiko Mizuno, Robert F. Jacob, Jungsoo Byun, R. Preston Mason |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Membrane bilayer
Peroxidation Biophysics Oxidative phosphorylation medicine.disease_cause Biochemistry Cell membrane Lipid peroxidation Membrane Lipids chemistry.chemical_compound X-Ray Diffraction Cholesterol domain Lipid droplet Atorvastatin medicine Pyrroles Phospholipids chemistry.chemical_classification Cholesterol Cell Membrane Cell Biology Oxidative Stress Polyunsaturated fatty acid Glucose Membrane medicine.anatomical_structure chemistry Heptanoic Acids Hyperglycemia lipids (amino acids peptides and proteins) Amlodipine Lipid Peroxidation Oxidative stress |
| Zdroj: | Biochimica et Biophysica Acta (BBA) - Biomembranes. 1788:1398-1403 |
| ISSN: | 0005-2736 |
| DOI: | 10.1016/j.bbamem.2009.04.004 |
| Popis: | Oxidative damage to vascular cell membrane phospholipids causes physicochemical changes in membrane structure and lipid organization, contributing to atherogenesis. Oxidative stress combined with hyperglycemia has been shown to further increase the risk of vascular and metabolic diseases. In this study, the effects of glucose on oxidative stress-induced cholesterol domain formation were tested in model membranes containing polyunsaturated fatty acids and physiologic levels of cholesterol. Membrane structural changes, including cholesterol domain formation, were characterized by small angle X-ray scattering (SAXS) analysis and correlated with spectrophotometrically-determined lipid hydroperoxide levels. Glucose treatment resulted in a concentration-dependent increase in lipid hydroperoxide formation, which correlated with the formation of highly-ordered cholesterol crystalline domains (unit cell periodicity of 34 Å) as well as a decrease in overall membrane bilayer width. The effect of glucose on lipid peroxidation was further enhanced by increased levels of cholesterol. Treatment with free radical-scavenging agents inhibited the biochemical and structural effects of glucose, even at elevated cholesterol levels. These data demonstrate that glucose promotes changes in membrane organization, including cholesterol crystal formation, through lipid peroxidation. |
| Databáze: | OpenAIRE |
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