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Immune dysfunction in uremia

G Cohen1, M Haag-Weber, W H Hörl

  • 1Department of Medicine, University of Vienna, Austria.

Kidney International. Supplement
|November 14, 1997
PubMed
Summary
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Uremic toxins impair immune cells called polymorphonuclear leukocytes (PMNLs), increasing infection risk in dialysis patients. Identifying these toxins helps understand and combat immune dysfunction in uremia.

Area of Science:

  • Nephrology
  • Immunology
  • Biochemistry

Background:

  • Infectious complications are a major cause of death in patients undergoing hemodialysis and peritoneal dialysis.
  • Uremia is associated with impaired function of polymorphonuclear leukocytes (PMNLs), critical for fighting bacterial infections.
  • Several factors, including iron overload, intracellular calcium, and dialysis treatment itself, contribute to diminished PMNL function.

Purpose of the Study:

  • To investigate the role of uremic toxins in suppressing immune cell function in patients with kidney failure.
  • To identify specific uremic toxins that inhibit PMNL functions.

Main Methods:

  • Isolation and characterization of proteins and solutes from the serum of uremic patients.
  • Assessment of the effects of isolated substances on PMNL functions, including chemotaxis, phagocytosis, intracellular killing, and respiratory burst activity.

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Main Results:

  • Several uremic toxins were identified, including immunoglobulin light chains, beta 2-microglobulin, angiogenin, complement factor D, ubiquitin, and p-cresol.
  • These toxins were shown to interfere with various PMNL functions, such as chemotaxis, degranulation, and respiratory burst.
  • Uremia also leads to defects in specific immune responses, including T-lymphocyte function and antibody production.

Conclusions:

  • Uremic toxins significantly contribute to the immune deficiency observed in patients on dialysis.
  • Understanding the mechanisms by which these toxins affect PMNLs is crucial for developing strategies to reduce infectious complications in uremia.