Aspirin restores normal baroreflex function in hypercholesterolemic rats by its antioxidative action.

Area of Science:

• Biochemistry
• Cardiovascular Physiology
• Pharmacology

Background:

• Aspirin is known for anti-platelet effects and potential antioxidant properties.
• Hypercholesterolemia is linked to impaired hemodynamics and baroreflex sensitivity.
• Oxidative stress plays a role in cardiovascular dysfunction.

Purpose of the Study:

• To investigate if aspirin's antioxidant effects can improve hemodynamic profile and baroreflex sensitivity in hypercholesterolemia.
• To assess aspirin's impact on lipid profile and oxidative stress markers in hypercholesterolemic rats.

Main Methods:

• Hypercholesterolemia was induced in Wistar rats using a cholesterol-rich diet for 10 weeks.
• Serum lipid profile, lipid peroxidation, and reduced glutathione levels were measured.
• Hemodynamic parameters and baroreflex sensitivity were assessed in anesthetized rats.

Main Results:

• Hypercholesterolemic rats exhibited dyslipidemia, elevated blood pressure, increased heart rate, and reduced baroreflex sensitivity.
• Aspirin treatment significantly improved lipid profiles, lowering LDL-C and VLDL-C while increasing HDL-C.
• Aspirin mitigated hemodynamic changes, reduced blood pressure and heart rate, and enhanced baroreflex sensitivity.
• Aspirin treatment reduced lipid peroxidation and increased reduced glutathione levels, indicating reduced oxidative stress.

Conclusions:

• Aspirin, through its antioxidant effects, improves baroreflex sensitivity and prevents adverse hemodynamic changes in hypercholesterolemia.
• Aspirin's beneficial effects may stem from reduced sympathetic activity secondary to its antioxidant action.
• These findings suggest a potential therapeutic role for aspirin in managing cardiovascular complications associated with hypercholesterolemia.