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The role of complement in IgA nephropathy.

Agustin Tortajada1, Eduardo Gutierrez2, Matthew C Pickering3

  • 1Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine and 12 de Octubre Health Research Institute (imas12), Madrid, Spain.

Molecular Immunology
|July 28, 2019
PubMed
Summary

IgA nephropathy (IgAN) involves complex complement system activation, particularly the factor H related proteins and lectin pathway in severe cases. Understanding these pathways could lead to targeted therapies for preventing IgAN progression and kidney damage.

Keywords:
ComplementGlomerulonephritisIgA nephropathy

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Area of Science:

  • Nephrology
  • Immunology
  • Complement System Biology

Background:

  • IgA nephropathy (IgAN) is a prevalent kidney disease with variable clinical and histological presentations.
  • The precise mechanisms driving IgAN pathogenesis, particularly glomerular inflammation and injury, remain incompletely understood.
  • Established associations exist between IgAN and markers of complement activation, but the specific pathways and their contributions are not fully defined.

Purpose of the Study:

  • To elucidate the role of specific complement pathways and proteins in IgA nephropathy pathogenesis.
  • To investigate the contribution of complement deregulation to glomerular inflammation and renal injury in IgAN.
  • To identify potential biomarkers for predicting IgAN progression and therapeutic targets for complement inhibition.

Main Methods:

  • Review of recent scientific literature identifying specific complement pathways and proteins in severe IgAN cases.
  • Analysis of established associations between IgAN and glomerular and circulating markers of complement activation.
  • Exploration of the pathogenic roles of complement factor H related proteins 1 and 5, and the lectin pathway in IgAN.

Main Results:

  • Recent findings implicate specific complement pathways, including factor H related proteins 1 and 5 and the lectin pathway, in the pathogenesis of severe IgAN.
  • Evidence suggests that complement deregulation and activation are significant drivers of renal injury in a subset of IgAN patients.
  • Markers of complement activation may serve to identify IgAN patients at higher risk for progressive renal impairment.

Conclusions:

  • Complement system dysregulation plays a critical role in IgA nephropathy, particularly in severe forms of the disease.
  • Targeting specific complement pathways, such as those involving factor H related proteins and the lectin pathway, may offer novel therapeutic strategies for IgAN.
  • Complement inhibition holds promise for preventing and reducing glomerular injury, potentially altering the course of IgAN and preventing end-stage renal disease.