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Related Experiment Videos

Glomerular complement regulation is overwhelmed in passive Heymann nephritis.

P N Cunningham1, B K Hack, G Ren

  • 1Section of Nephrology, The University of Chicago, Chicago, Illinois 60637, USA. pcunning@medicine.bsd.uchicago.edu

Kidney International
|September 5, 2001
PubMed
Summary

Passive Heymann nephritis (PHN) requires complement regulatory proteins Crry and CD59. Neutralizing both Crry and CD59 in rats induced significant proteinuria, confirming their role in preventing membranous nephropathy.

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Area of Science:

  • Nephrology
  • Immunology
  • Complement System

Background:

  • Passive Heymann nephritis (PHN) is a rat model of membranous nephropathy induced by anti-Fx1A antibodies.
  • Fx1A contains megalin, but anti-megalin antibodies alone do not cause proteinuria in rats.
  • PHN is complement-dependent, suggesting complement regulatory proteins are involved.

Purpose of the Study:

  • To investigate the role of complement regulatory proteins Crry and CD59 in the development of PHN.
  • To determine if simultaneous neutralization of Crry and CD59 is necessary to induce PHN.

Main Methods:

  • Rats were injected with anti-megalin antibodies, followed by anti-Crry and/or anti-CD59 antibodies.
  • Experiments also involved injecting rats with anti-Fx1A or anti-Fx1A depleted of anti-Crry/CD59 reactivity.

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Main Results:

  • Simultaneous neutralization of Crry and CD59, alongside anti-megalin antibodies, caused significant proteinuria.
  • Inhibition of only one regulator or neither did not result in proteinuria.
  • Animals receiving anti-Fx1A depleted of anti-Crry/CD59 developed typical PHN with glomerular C3 and C5b-9 deposition.

Conclusions:

  • Crry and CD59 are crucial in preventing complement-mediated glomerular injury.
  • In PHN, the regulatory capacity of Crry and CD59 is overwhelmed, leading to injury.