OBJECTIVE: To study the effects of polyunsaturated fatty acids (PUFA) omega-3 and omega-6 in the oxidative stress and in liver regeneration in rats subjected to 70% partial hepatectomy (PH, 70% hepatectomy, Higgins- Anderson partial hepatectomy). METHODS: 72 young male Wistar rats were randomly divided into four equal-sized groups: control (G1), partially hepatectomized (G2), partially hepatectomized with two weeks daily intraperitoneal infusion of omega-3 (G3) and partially hepatectomized with two weeks daily intraperitoneal infuison of omega-6 (G4). In moments 36h (T1), 168h (T2) and 336h (T3) post-PH, thiobarbituric acid reactive substances (TBARS) and reduced glutathione (GSH) were measured in plasma and liver tissue, while glucose and total bilirubin were measured in blood. The mass of the residual liver in the same moments was the parameter used to estimate the evolution of liver regeneration. RESULTS: omega-3 PUFA inhibited liver regeneration and induced reduction of hepatic GSH concentration seven days post-PH. Omega-6 PUFA, in contrast, showed no inhibitory effect on regeneration. There was an increase of lipid peroxidation both in blood and liver with administration of omega-6. CONCLUSION: Omega-3 PUFA retarded post-PH liver regeneration, probably through inhibition of oxidative stress. Omega-6 PUFA increased TBARS concentrations in blood and liver but did not alter the evolution of the liver regenerative process.
Liver Regeneration; Oxidative Stress; Fatty Acids; Lipid peroxidation; Rats
