Objective: To investigate the relation between the severity of hypoxic changes and oxidative DNA damage in the placenta of early and late-onset preeclampic women and fetal growth restriction (FGR), serum parameters of oxidative stress, placental hypoxic change, and oxidative DNA damage were determined.
Methods: We examined 10 participants with uncomplicated pregnancies, 13 with early-onset and 12 with late-onset preeclampsia. Maternal and umbilical plasma derivatives of reactive oxygen metabolites (d-ROMs) were measured as markers of oxygen free radicals. Immunohistochemical analysis was performed to measure the proportion of placental trophoblast cell nuclei staining positive for 8-hydroxy-2'-deoxyguanosine (8-OHdG), redox factor-1 (ref-1), and hypoxia-induced factor-1α (HIF-1α), which are markers of oxidative DNA damage, repair functions, and hypoxia status, respectively.
Results: 8-OHdG was higher in both preeclamptic groups, but significantly higher in the early-onset preeclamptic group. Ref-1 was higher in the late-onset preeclamptic group. HIF-1α was higher in both preeclamptic groups, with a tendency towards a higher in the early-onset preeclamptic group.
Conclusions: Our findings indicate that the severity of hypoxic changes and oxidative DNA damage are greater in the placenta of women with early-onset preeclampsia, and that the prolonged preeclamptic conditions may reduce placental blood flow, ultimately leading to FGR.