Iron and infection

Area of Science:

• Nephrology
• Infectious Diseases
• Hematology

Background:

• Intravenous iron therapy is crucial for managing anemia in dialysis patients, maintaining iron stores and reducing erythropoietin needs.
• Iron availability is directly linked to bacterial virulence and multiplication, suggesting a role for iron in infection risk.
• Clinical conditions with iron excess may heighten susceptibility to infections, particularly in patients with end-stage renal disease (ESRD).

Purpose of the Study:

• To investigate the potential adverse effects of intravenous iron therapy on infection risk in patients undergoing regular dialysis.
• To explore the mechanisms by which iron excess might compromise host defense and promote bacterial growth.
• To evaluate the impact of iron therapy on immune cell function in ESRD patients.

Main Methods:

• Review of existing microbiology, human, and animal studies on iron availability and bacterial virulence.
• Analysis of the role of hydroxyl radicals (Fenton and Haber-Weiss reactions) in iron-induced cellular damage.
• Examination of factors contributing to infection risk in ESRD patients, including dialysis, malnutrition, and uremic toxins.

Main Results:

• Iron excess in the host can promote bacterial virulence and multiplication, increasing infection susceptibility.
• Parenteral iron administration during infection has demonstrated harmful effects in both human and animal studies.
• Intravenous iron therapy may negatively impact phagocytes, T lymphocytes, and B lymphocytes in ESRD patients, impairing immune response.

Conclusions:

• Overtreatment with intravenous iron in ESRD patients may exacerbate pre-existing infection risks associated with dialysis and uremia.
• The damaging effects of iron are mediated by hydroxyl radicals, contributing to cellular injury during infection.
• Balancing iron levels is critical in dialysis patients to prevent increased susceptibility to infectious complications.