Vitamin e-loaded membrane dialyzers reduce hemodialysis inflammaging

Area of Science:

• Immunology
• Nephrology
• Biochemistry

Background:

• Inflammaging is a chronic inflammatory state linked to immune system senescence.
• This condition impairs immune responses in chronic diseases like diabetes, cancer, and hemodialysis.
• Hemodialysis patients exhibit increased susceptibility to infections and reduced vaccine efficacy due to inflammaging.

Purpose of the Study:

• To investigate the impact of different hemodialysis treatments on inflammaging.
• To evaluate changes in indoleamine 2,3-dioxygenase-1 (IDO1) activity and nitric oxide (NO) formation.
• To assess the efficacy of vitamin E-loaded dialyzers in mitigating hemodialysis-induced inflammation.

Main Methods:

• A randomized controlled observational crossover trial involving 18 hemodialysis patients.
• Patients underwent three treatments: low-flux bicarbonate hemodialysis, low-flux bicarbonate hemodialysis with vitamin E-loaded dialyzers, and hemodiafiltration.
• Blood samples were analyzed for kynurenine, L-tryptophan, and nitric oxide levels, compared to 14 healthy volunteers.

Main Results:

• Hemodialysis patients showed significantly higher kynurenine/L-tryptophan ratios, indicating increased IDO1 activity, compared to controls.
• Vitamin E-loaded dialyzers significantly reduced kynurenine levels and IDO1 activity compared to standard low-flux and hemodiafiltration.
• Nitric oxide levels were lower in hemodialysis patients than controls, with significantly lower levels in venous blood during vitamin E-loaded dialyzer treatment.

Conclusions:

• Low-flux bicarbonate hemodialysis with vitamin E-loaded dialyzers is a more biocompatible procedure.
• This treatment effectively reduces IDO1 activity and nitric oxide formation, mitigating hemodialysis inflammaging.
• The findings suggest potential benefits for proinflammatory signaling regulation at a molecular level.