Perfluorooktanoična kiselina oštećuje moždano i jetreno tkivo putem oksidacijskoga stresa

The aim of this study was to investigate oxidative stress induced by perfluorooctanoic acid (PFOA) in the brain and liver tissues of Balb/c mice as well as protective effects of taurine and coenzyme Q10 (CoQ10) in both organs. For this purpose, animals were treated with PFOA (15 and 30 mg/kg) orally and their lipid peroxidation, total glutathione levels (GSH), and antioxidant enzyme activities measured and both tissues analysed for histopathological changes. Our results showed a dose-dependent decrease in body weight and increase in relative brain and liver weights, PFOA-induced lipid peroxidation and reduced glutathione peroxidase (GPx) activity in the brain tissue, and changes in GSH levels, GPx, superoxide dismutase (Cu-Zn SOD), and catalase (CAT) activities in the liver tissue. Pre-treatment with taurine or CoQ10 provided protection against PFOA-induced Cu-Zn SOD reduction in the liver tissue. Our findings evidence the depleting effect of PFOA on antioxidative systems and confirm that PFOA exerts its (neuro)toxicity through oxidative stress, but further research is needed to identify the exact toxicity mechanisms, especially in the brain.
Cilj je ovog istraživanja bio utvrditi oksidacijski stres prouzročen perfluorooktanoičnom kiselinom (PFOA) u moždanom i jetrenom tkivu Balb/c miševa te zaštitno djelovanje taurina i koenzima Q10 (CoQ10) u oba organa. U tu su svrhu životinje izložene PFOA-i u oralnoj dozi od 15 ili 30 mg/kg tjelesne težine te su u oba tkiva analizirane histopatološke promjene i izmjerene lipidna peroksidacija, ukupne razine glutationa (GSH) i aktivnosti antioksidacijskih enzima. Naši rezultati pokazuju smanjenje ukupne tjelesne težine i povećanje relativne težine organa ovisne o dozi, lipidnu peroksidaciju i smanjenu aktivnost glutation peroksidaze (GPx) u moždanom tkivu te promjene razina GSH i aktivnosti GPx, superoksid dismutaze (Cu-Zn SOD) i katalaze (CAT) u jetrenom tkivu. Prethodna primjena taurina ili CoQ10 zaštitila je životinje izložene PFOA-i od pada razina Cu-Zn SOD u jetrenom tkivu. Naši rezultati potvrđuju da PFOA iscrpljuje antioksidacijske sustave i djeluje (neuro)toksično putem oksidacijskoga stresa, no potrebna su daljnja istraživanja kako bi se precizno utvrdili njegovi mehanizmi toksičnosti, napose u mozgu.