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Alternative pathway dysfunction in kidney disease: a case report and review of dense deposit disease and C3

Amret Hawfield1, Samy S Iskandar, Richard J H Smith

  • 1Wake Forest School of Medicine, Winston-Salem, NC, USA. ahawfiel@wakehealth.edu

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|February 9, 2013
PubMed

Insights

Dysfunction in the alternative pathway of complement activation links dense deposit disease and atypical hemolytic uremic syndrome. Understanding this pathway is key for diagnosing and treating these C3 glomerulopathies.

Area of Science:

  • Nephrology
  • Immunology
  • Pathology

Background:

  • Dense deposit disease (DDD), previously membranoproliferative glomerulonephritis type II, is a rare kidney disease.
  • It is characterized by the deposition of electron-dense material in the glomerular basement membrane.
  • DDD is now understood to be a C3 glomerulopathy, linked to complement alternative pathway dysregulation.

Observation:

  • Atypical hemolytic uremic syndrome (aHUS) shares a pathophysiologic link with DDD through complement alternative pathway dysfunction.
  • Distinguishing DDD from immune complex-mediated glomerulonephritis is crucial, as DDD shows minimal immunoglobulin deposition.
  • Advances in understanding complement dysregulation have refined the classification of DDD.

Findings:

  • Alternative complement pathway dysfunction is a unifying factor in DDD and aHUS.
  • Immunofluorescence findings, particularly the lack of significant immunoglobulin deposition, help differentiate DDD from other glomerulonephritides.
  • The study reviews a case of DDD, highlighting its distinct pathology and clinical course.

Implications:

  • Understanding complement alternative pathway dysregulation offers new diagnostic and therapeutic targets for DDD and related C3 glomerulopathies.
  • This knowledge helps separate DDD from immune complex glomerulonephritis, improving diagnostic accuracy.
  • Further research into complement-mediated kidney diseases is essential for developing effective treatments.

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