Abstract :
[en] Estetrol (E4), estradiol (E2) and progesterone (P4) have important antioxidative
and neuroprotective effects in neuronal system. We aimed to study the consequence
of combined steroid therapy in neonatal hypoxic-ischemic encephalopathy (HIE). In
vitro the effect of E4 combined with other steroids on oxidative stress and the cell
viability in primary hippocampal cultures was evaluated by lactate dehydrogenase
and cell survival assays. In vivo neuroprotective and therapeutic efficacy of E4
combined with other steroids was studied in HIE model of immature rats. The rat
pups rectal temperature, body and brain weights were evaluated. The hippocampus
and the cortex were investigated by histo/immunohistochemistry: intact cell number
counting, expressions of markers for early gray matter lose, neuro- and angiogenesis
were studied. Glial fibrillary acidic protein was evaluated by ELISA in blood samples.
In vitro E4 and combinations of high doses of E4 with P4 and/or E2 significantly
diminished the LDH activity and upregulated the cell survival. In vivo pretreatment
or treatment by different combinations of E4 with other steroids had unalike effects
on body and brain weight, neuro- and angiogenesis, and GFAP expression in blood.
The combined use of E4 with other steroids has no benefit over the single use of E4.
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