The development of atypical hemolytic uremic syndrome depends on complement C5

J Am Soc Nephrol. 2011 Jan;22(1):137-45. doi: 10.1681/ASN.2010050451. Epub 2010 Dec 9.

Abstract

Gene variants in the alternative pathway of the complement system strongly associate with atypical hemolytic uremic syndrome (aHUS), presumably by predisposing to increased complement activation within the kidney. Complement factor H (CFH) is the major regulator of complement activation through the alternative pathway. Factor H-deficient mice transgenically expressing a mutant CFH protein (Cfh(-/-).FHΔ16-20) that functionally mimics the CFH mutations reported in aHUS patients spontaneously develop thrombotic microangiopathy. To investigate the role of complement C5 activation in this aHUS model, we generated C5-deficient Cfh(-/-).FHΔ16-20 mice. Both C5-sufficient and C5-deficient Cfh(-/-).FHΔ16-20 mice had abnormal C3 deposition within the kidney, but spontaneous aHUS did not develop in any of the C5-deficient mice. Furthermore, although Cfh(-/-).FHΔ16-20 animals demonstrated marked hypersensitivity to experimentally triggered renal injury, animals with concomitant C5 deficiency did not. These data demonstrate a critical role for C5 activation in both spontaneous aHUS and experimentally triggered renal injury in animals with defective complement factor H function. This study provides a rationale to investigate therapeutic inhibition of C5 in human aHUS.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Atypical Hemolytic Uremic Syndrome
  • Complement C3 / metabolism
  • Complement C5 / deficiency
  • Complement C5 / genetics
  • Complement C5 / physiology*
  • Complement C9 / metabolism
  • Complement Factor H / deficiency
  • Complement Factor H / genetics
  • Complement Factor H / physiology
  • Disease Models, Animal
  • Glomerular Mesangium / metabolism
  • Hemolytic-Uremic Syndrome / physiopathology
  • Mice
  • Mice, Inbred C57BL
  • Mice, Inbred CBA
  • Mice, Knockout

Substances

  • Complement C3
  • Complement C5
  • Complement C9
  • Complement Factor H