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Complement activation by cellulosic dialysis membranes

A Innes1, A M Farrell, R P Burden

  • 1Department of Renal Medicine, City Hospital, Nottingham.

Journal of Clinical Pathology
|February 1, 1994
PubMed
Summary
This summary is machine-generated.

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Cellulosic dialysis membranes activate complement, increasing C3dg and C4d levels, suggesting both classical and alternative pathway involvement. This indicates significant complement activation during hemodialysis with these membranes.

Area of Science:

  • Nephrology
  • Immunology
  • Biochemistry

Background:

  • Hemodialysis utilizes membranes to filter blood, but membrane-cell interactions can trigger immune responses.
  • Cellulosic membranes are known to activate the complement system, a critical part of innate immunity.

Purpose of the Study:

  • To investigate the impact of cellulosic dialysis membranes on complement activation.
  • To determine the specific role of the classical complement pathway in this activation process.

Main Methods:

  • Studied complement activation in 33 patients undergoing hemodialysis with cellulosic membranes.
  • Measured pre- and post-dialysis plasma levels of C3, C4, C3dg, C4d, and C-reactive protein (CRP).
  • Utilized Wilcoxon signed rank test for statistical analysis and calculated ratios to account for hemodilution.

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Main Results:

  • Post-dialysis levels of C4, C3dg, and C4d significantly increased, indicating complement activation.
  • C3dg and C4d concentrations showed a significant positive correlation.
  • Adjusted ratios confirmed increased C3dg and C4d, suggesting classical pathway activation alongside the alternative pathway.

Conclusions:

  • Hemodialysis with cellulosic membranes leads to significant complement activation.
  • Increased C3dg and C4d levels point to the involvement of the classical complement pathway.
  • Findings suggest that both classical and alternative pathways are activated during dialysis with cellulosic membranes.