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Plasma terminal complement complexes in acute poststreptococcal glomerulonephritis.

D G Matsell1, S Roy, J D Tamerius

  • 1Division of Nephrology, LeBonheur Children's Medical Center, Memphis, TN.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|March 1, 1991
PubMed
Summary
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Terminal complement complexes (TCC) are elevated in acute poststreptococcal glomerulonephritis (APSGN). SC5b-9 levels correlated with disease severity and improved as kidney function recovered, suggesting TCC

Area of Science:

  • Nephrology
  • Immunology
  • Pediatrics

Background:

  • Acute poststreptococcal glomerulonephritis (APSGN) involves complement system activation.
  • Decreased complement proteins (C3, C5, properdin) are observed in APSGN.
  • Terminal complement complexes (TCC) are implicated in glomerular injury.

Purpose of the Study:

  • To investigate the role of SC5b-9, a marker of TCC formation, in APSGN pathogenesis.
  • To assess SC5b-9 levels as a potential clinical marker in children with APSGN.

Main Methods:

  • Plasma SC5b-9 concentrations were measured using enzyme immunoassay in 13 children with APSGN.
  • Measurements were taken during the acute phase and compared with convalescent samples.
  • Correlations between SC5b-9 levels and clinical markers of kidney function were analyzed.

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Main Results:

  • SC5b-9 was significantly elevated in all acute APSGN plasmas within 30 days of onset.
  • Acute SC5b-9 levels were significantly higher than paired convalescent samples.
  • Decreasing SC5b-9 concentrations correlated with improved serum creatinine and reduced proteinuria.

Conclusions:

  • TCC generation is common in the early stages of APSGN.
  • Elevated SC5b-9 levels may indicate active glomerular injury in APSGN.
  • SC5b-9 serves as a potential biomarker for monitoring APSGN activity and recovery.