Glomeruli of Dense Deposit Disease contain components of the alternative and terminal complement pathway

Sanjeev Sethi, Jeffrey D. Gamez, Julie A. Vrana, Jason D. Theis, H. Robert Bergen, Peter F. Zipfel, Ahmet Dogan, Richard J.H. Smith

Research output: Contribution to journalArticle

129 Scopus citations

Abstract

Dense Deposit Disease (DDD), or membranoproliferative glomerulonephritis type II, is a rare renal disease characterized by dense deposits in the mesangium and along the glomerular basement membranes that can be seen by electron microscopy. Although these deposits contain complement factor C3, as determined by immunofluorescence microscopy, their precise composition remains unknown. To address this question, we used mass spectrometry to identify the proteins in laser microdissected glomeruli isolated from paraffin-embedded tissue of eight confirmed cases of DDD. Compared to glomeruli from five control patients, we found that all of the glomeruli from patients with DDD contain components of the alternative pathway and terminal complement complex. Factor C9 was uniformly present as well as the two fluid-phase regulators of terminal complement complex clusterin and vitronectin. In contrast, in nine patients with immune complex-mediated membranoproliferative glomerulonephritis, glomerular samples contained mainly immunoglobulins and complement factors C3 and C4. Our study shows that in addition to fluid-phase dysregulation of the alternative pathway, soluble components of the terminal complement complex contribute to glomerular lesions found in DDD.

Original languageEnglish (US)
Pages (from-to)952-960
Number of pages9
JournalKidney international
Volume75
Issue number9
DOIs
StatePublished - May 1 2009

Keywords

  • Alternative and terminal complement pathways
  • Dense Deposit Disease
  • Factor H-related protein I
  • Kidney

ASJC Scopus subject areas

  • Nephrology

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