Oxidative imbalance in low/intermediate-1-risk myelodysplastic syndrome patients: The influence of iron overload

Area of Science:

• Hematology
• Oxidative Stress Research
• Mitochondrial Biology

Background:

• Myelodysplastic syndromes (MDS) are a group of clonal hematopoietic stem cell disorders.
• Iron overload (IOL) is a common complication in MDS, potentially influencing disease progression.
• Oxidative stress is implicated in the pathogenesis of various hematological malignancies.

Purpose of the Study:

• To investigate reactive oxygen species (ROS) generation in MDS patients with and without iron overload.
• To evaluate the role of key antioxidant pathways in the context of MDS and iron overload.
• To assess mitochondrial function and oxidative damage markers in MDS patients with IOL.

Main Methods:

• Quantification of superoxide anion (O2-), hydrogen peroxide (H2O2), and oxidative damage markers (8-isoprostanes, 8-oxo-dG).
• Measurement of antioxidant levels including glutathione (GSH), superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx).
• Assessment of mitochondrial membrane potential (ΔΨm) in 42 MDS patients and 20 healthy controls.

Main Results:

• MDS patients with iron overload exhibited significantly higher superoxide anion levels compared to controls and patients without IOL.
• Antioxidant systems (CAT, GPx, GSH) showed significant alterations in IOL patients, while SOD activity remained unchanged.
• Mitochondrial dysfunction (reduced ΔΨm) was observed exclusively in MDS patients with iron overload.

Conclusions:

• Oxidative stress is a dynamic process in MDS, significantly influenced by the presence of iron overload.
• Iron overload contributes to increased ROS production and mitochondrial dysfunction in MDS.
• These findings underscore the importance of managing iron levels in MDS to mitigate oxidative stress.