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Increased superoxide anion production by platelets in hypercholesterolemic patients
Valerio Sanguigni1, Pasquale Pignatelli, Daniela Caccese
1Department of Internal Medicine, University Tor Vergata, Rome, Italy.
Thrombosis and Haemostasis
|June 1, 2002
Summary
High LDL cholesterol increases platelet superoxide anion production. Atorvastatin treatment reduced both, suggesting both cholesterol-lowering and other mechanisms contribute to its antioxidant effects.
Area of Science:
- Cardiovascular Research
- Biochemistry
- Oxidative Stress
Background:
- Hypercholesterolemia is linked to increased cellular superoxide anion (O2-) production in experimental models.
- This study aimed to determine if this association exists in humans.
Purpose of the Study:
- To investigate the relationship between hypercholesterolemia and platelet superoxide anion (O2-) production in humans.
- To assess the effect of atorvastatin on hypercholesterolemia and O2- production.
Main Methods:
- Measured lipid profiles and platelet O2- production in hypercholesterolemic patients and healthy controls.
- Assessed changes after 8-week atorvastatin treatment.
- Investigated the mechanism of LDL cholesterol-induced O2- production using platelet incubations with enzyme inhibitors.
Main Results:
- Platelet O2- generation was significantly higher in hypercholesterolemic patients and correlated with LDL cholesterol.
- Atorvastatin treatment significantly reduced both LDL cholesterol and platelet O2- production.
- LDL cholesterol incubation increased platelet O2- production, inhibited by PLA2 and NADH/NADPH oxidase inhibitors.
Conclusions:
- LDL cholesterol elevates platelet O2- production via PLA2 and NADH/NADPH enzyme activation.
- Atorvastatin's inhibition of platelet O2- release is partly due to cholesterol reduction.
- Other mechanisms may contribute to atorvastatin's antioxidant effects.