Abstract
Our aim was to explore the effects and mechanism of 17-alpha-estradiol (17α-E2) on oxygen-induced retinopathy (OIR) in a murine model. Newborn mice exposed to hyperoxia underwent subcutaneous injections of different doses of 17α-E2 from postnatal days (PND) 7 to 17. The retinal flat mounts were scored for avascular/total retinal area on PND 17. Vascular endothelial growth factor (VEGF), malondialdehyde (MDA) concentrations, and intensity, activity, and quality of reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase in the retina were determined on PND 9, 13 (14), and 17. The avascular area, which is found in retinas of hyperoxia-exposed pups but not in retinas of normoxia-exposed ones, was significantly smaller in retinas of 17α-E2-treated pups. MDA and VEGF concentrations and intensity, activity, and quality of NADPH oxidase were stable in retinas of normoxia pups on PND 9, 13 (14), and 17, whereas in retinas of hyperoxia-exposed and 17α-E2-treated pups, they fluctuated markedly. VEGF concentrations were lower in retinas of hyperoxia-exposed pups than in those of normoxia ones on PND 9. Elevated VEGF concentrations were found in retinas of 17α-E2-treated pups on PND 9 and in hyperoxia-exposed pups on PND 14 and ...Continue Reading
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