Effect of n-3 fatty acids and statins on oxidative stress in statin-treated hypercholestorelemic and normocholesterolemic women.

Introduction: Although the combination of statins with n-3 fatty acids seems to be beneficial under the lipid profile aspect, there is little information about the interaction of these two compounds on oxidative stress.
Objective: Evaluate the interaction between statins and n-3 fatty acids on oxidative stress in women, using a 2² factorial design.
Methods: Forty-three women participated in this crossover design. They were separated into two groups in which 20 were under statin treatment for more than 6 months, and 23 were normolipidemic. Within each group, half of the patients received capsules containing 2.4 g/day of a mixture of EPA and DHA for 6 weeks, while the other half received a mixture of soya and corn oil. After a period of 90 days of washout, the groups were switched, and received the supplementation for 6 weeks more.
Results: Statins reduced serum LDL and increased SOD expression. n-3 fatty acids increased the plasma malondialdehyde and SOD activity but reduced catalase expression (p<0.05). The interaction involving statins and n-3 fatty acids was nearly significant to the serum triacylglycerol reduction (p=0.054).
Conclusion: Combining statins and n-3 fatty acids is an excellent strategy to reduce plasma cholesterol and triacylglycerol concentration in women. However, n-3 fatty acids increased the oxidative stress and the pleiotropic effect of statins seemed to be not enough to counterbalance this result. Our data also suggested that the mechanism by which n-3 fatty acids interfere in oxidative stress can be associated with antioxidant enzymes expression and activity.
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