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Related Experiment Videos

Glomerular C3c localization indicates ongoing immune deposit formation and complement activation in experimental

M Schulze1, C J Pruchno, M Burns

  • 1Division of Nephrology, University of Washington, Seattle 98195.

The American Journal of Pathology
|January 1, 1993
PubMed
Summary

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Glomerular C3c deposits clear within 24 hours after complement activation stops in glomerulonephritis models. This rapid clearance of C3c indicates recent complement activation, aiding in diagnosing kidney disease.

Area of Science:

  • Nephrology
  • Immunology
  • Biochemistry

Background:

  • Antibody-mediated glomerular diseases feature C3 deposits.
  • Factor I degrades C3b to C3c and C3d.
  • Kinetics of C3b degradation in glomerulonephritis are undefined.

Purpose of the Study:

  • Define the kinetics of C3b degradation in experimental glomerulonephritis.
  • Assess the clearance rate of C3c and C3d deposits in glomeruli.

Main Methods:

  • Studied three models of complement-dependent glomerulonephritis.
  • Halted C3b deposition using cobra venom factor.
  • Measured C3c and C3d disappearance using specific antibodies and quantitative fluorescence densitometry.

Main Results:

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  • Glomerular C3c deposits decreased by over 85% within 24 hours across all models.
  • C3c clearance was independent of deposit formation site or mechanism.
  • C3d deposits remained even without ongoing complement activation.
  • C3c clearance paralleled normalization of urinary C5b-9 excretion in passive Heymann nephritis.

Conclusions:

  • Glomerular C3c deposits are cleared within 24 hours after complement activation ceases.
  • Positive C3c staining signifies recent complement activation and potential immune deposit formation.