Ferrostatin-1 Reversed Chronic Intermittent Hypoxia-Induced Ferroptosis in Aortic Endothelial Cells via Reprogramming Mitochondrial Function.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory study using cultured rat aortic endothelial cells.
PubMed 38680190 · doi:10.2147/NSS.S442186
What was done
Cultured rat aortic endothelial cells (ROAECs) were allocated to three experimental conditions: control, chronic intermittent hypoxia (CIH), and CIH with ferrostatin-1 (Fer-1) co-treatment. Investigators evaluated cell viability (CCK-8), apoptosis, total reactive oxygen species (ROS), intracellular ferrous iron (Fe2+), and lipid ROS via flow cytometry. Malondialdehyde (MDA) levels and NAD+/NADH ratios were measured by ELISA. Expression of ferroptosis markers SLC7A11 and GPX4 was assessed using qRT-PCR and Western blot. Mitochondrial ultrastructure and mitochondrial membrane potential (MMP) were evaluated using transmission electron microscopy (TEM) and JC-1 staining, and alterations in central carbon metabolism (TCA cycle) were measured.
What was found
CIH exposure significantly reduced cell viability, decreased NAD+/NADH ratios, and downregulated mRNA and protein levels of GPX4 and SLC7A11 (all p < 0.05). CIH also significantly increased apoptosis rates, total ROS, Fe2+, lipid ROS, and MDA levels (all p < 0.05), alongside inducing mitochondrial membrane damage, matrix spillover, decreased MMP, and altered TCA cycle metabolites. Fer-1 co-treatment significantly reversed all reported CIH-induced changes in viability, oxidative/lipid markers, iron levels, SLC7A11/GPX4 expression (all p < 0.05), mitochondrial morphology, and central carbon metabolites. Specific numerical values and effect sizes were not reported in the abstract.
Why it matters
This study identifies ferroptosis and mitochondrial metabolic disruption as mechanistic drivers of intermittent hypoxia-induced vascular endothelial injury, suggesting potential molecular targets to explore for cardiovascular complications in sleep apnea.
Limits
The study is restricted to an in vitro rat cell culture model, lacking in vivo animal or human validation. The abstract omits specific quantitative values, baseline measures, exposure durations, and Fer-1 dosing concentrations.