Increasing the Magnesium Concentration in Various Dialysate Solutions Differentially Modulates Oxidative Stress in a...

Area of Science:

• Nephrology
• Biochemistry
• Immunology

Background:

• Hemodialysis patients experience increased oxidative stress due to uremia and dialysis fluids.
• Magnesium (Mg) modulates immune function and reduces oxidative stress.

Purpose of the Study:

• To investigate if increasing magnesium concentration in different dialysis fluids (DFs) protects immunocompetent cells from oxidative stress in vitro.
• To assess the impact of varying Mg levels in acetate (ADF), citrate (CDF), and citrate-acetate (ACDF) dialysis fluids.

Main Methods:

• THP-1 monocyte cultures were treated with ADF, CDF, and ACDF containing standard (0.5 mM) or high (1-2 mM) Mg concentrations.
• Cells were exposed to basal and uremic conditions (indoxyl sulfate treatment).
• Reactive oxygen species (ROS) and malondialdehyde (MDA) levels were quantified.

Main Results:

• Under uremic conditions, standard Mg DFs increased ROS and lipid damage compared to controls.
• CDF and ACDF with standard Mg showed less oxidative stress than ADF.
• High Mg (1.25-2 mM) in CDF and ACDF reduced ROS and MDA, indicating protection.
• Elevated Mg in ADF, however, increased ROS and MDA production.

Conclusions:

• Increasing magnesium in dialysis fluids has differential effects on oxidative stress in uremic conditions.
• Citrate-containing dialysis fluids with higher magnesium concentrations show potential for mitigating oxidative stress.
• The type of dialysis fluid significantly influences the impact of magnesium on oxidative stress reduction.