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[The complement system-a "hot topic" not only for kidney diseases].

Kerstin Amann1, Christoph Daniel2, Maike Büttner-Herold2

  • 1Abt. Nephropathologie, Pathologisches Institut, Friedrich-Alexander Universität (FAU) Erlangen-Nürnberg, Krankenhausstr. 8-10, 91054, Erlangen, Deutschland. kerstin.amann@uk-erlangen.de.

Der Pathologe
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Summary
This summary is machine-generated.

The complement system, particularly its alternative pathway, is increasingly linked to systemic and renal diseases like atypical hemolytic uremic syndrome (aHUS). Therapies targeting complement activation show promise in treating these conditions.

Keywords:
Alternative pathwayClassical pathwayComplement-mediated systemic kidney diseaseKidney transplantationLectin pathway

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Area of Science:

  • Immunology
  • Nephrology
  • Genetics

Background:

  • The complement system, especially the alternative pathway, plays a crucial role in systemic and renal diseases.
  • Atypical hemolytic uremic syndrome (aHUS) is a key example, characterized by thrombotic microangiopathy (TMA) due to complement overactivation.
  • Genetic analyses have significantly advanced our understanding of aHUS pathogenesis.

Purpose of the Study:

  • To review the growing interest and recent insights into complement system involvement in systemic and renal diseases.
  • To highlight the therapeutic implications of understanding complement pathway dysregulation.
  • To discuss the identification of new complement-mediated diseases.

Main Methods:

  • Review of recent pathophysiological and therapeutic insights.
  • Analysis of genetic findings in atypical hemolytic uremic syndrome (aHUS).
  • Identification of systemic and renal diseases linked to complement pathway mutations or auto-antibodies.

Main Results:

  • Excessive alternative complement pathway activation is central to aHUS and TMA.
  • Inhibition of the terminal complement cascade (C5b9 inhibitor) successfully reduced local tissue damage in aHUS.
  • New complement-mediated diseases have been identified, often triggered by infections or hormonal changes in predisposed individuals.

Conclusions:

  • Understanding complement regulation allows for therapeutic modulation of complement pathways.
  • The increasing availability of complement-inhibiting drugs fuels interest in treating complement-mediated diseases.
  • Complement-mediated systemic and renal diseases are a rapidly evolving and significant area of medical research.