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As maternal diabetes impairs foetal lipid metabolism and growth, we aimed to determine whether PPAR\u03b1 activation regulates lipid metabolism in the foetal liver from diabetic rats as well as foetal weight and foetal liver weight.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Diabetes was induced by neonatal streptozotocin administration (90 mg\/kg). For <jats:italic>ex vivo<\/jats:italic> studies, livers from 21\u2010day\u2010old foetuses from control and diabetic rats were explanted and incubated in the presence of PPAR\u03b1 agonists (clofibrate and leukotriene B<jats:sub>4<\/jats:sub>) for further evaluation of lipid levels (by thin layer chromatography and densitometry), <jats:italic>de novo<\/jats:italic> lipid synthesis (by <jats:sup>14<\/jats:sup>C\u2010acetate incorporation) and lipid peroxidation (by thiobarbituric reactive substances evaluation). For <jats:italic>in vivo<\/jats:italic> studies, foetuses were injected through the uterine wall with leukotriene B<jats:sub>4<\/jats:sub> on days 19, 20 and 21 of gestation. On day 21 of gestation, foetal liver concentrations of lipids and lipoperoxides were evaluated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Foetuses from diabetic rats showed increased body weight and liver weight, as well as accumulation of triglycerides and cholesteryl esters, increased <jats:italic>de novo<\/jats:italic> lipid synthesis and lipid peroxidation in the liver when compared to controls. <jats:italic>Ex vivo<\/jats:italic> studies showed that PPAR\u03b1 ligands reduced both the concentrations and synthesis of the lipid species studied and lipid peroxidation in the foetal liver from diabetic rats. <jats:italic>In vivo<\/jats:italic> experiments showed that leukotriene B<jats:sub>4<\/jats:sub> reduced the concentrations of triglycerides, cholesteryl esters and phospholipids, as well as lipid peroxidation, foetal weight and foetal liver weight in diabetic rats.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>PPAR\u03b1 activation regulates the impaired foetal liver lipid metabolism, prevents hepatomegaly and reduces foetal overgrowth induced by maternal diabetes. 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