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Chromatin breakdown during necrosis by serum Dnase1 and the plasminogen system

Markus Napirei1, Swantje Wulf, Hans Georg Mannherz

  • 1Abteilung für Anatomie und Embryologie, Ruhr-Universität Bochum, Bochum, Germany. markus.napirei@ruhr-unibochem.de

Arthritis and Rheumatism
|June 10, 2004
PubMed
Abstract

Insights

Serum DNase1 and plasmin work together to break down chromatin in necrotic cells. This process is crucial for preventing autoimmunity, as seen in DNase1-deficient mice that develop lupus-like symptoms.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • DNase1-deficient mice exhibit systemic lupus erythematosus symptoms, including antinuclear autoantibodies.
  • Understanding the molecular mechanisms of autoimmunity is critical for developing targeted therapies.

Purpose of the Study:

  • To investigate the role of extracellular DNase1 in the breakdown of chromatin from necrotic cells.
  • To elucidate the molecular pathway by which serum DNase1 influences chromatin degradation.

Main Methods:

  • Induction of necrosis in human cell lines (e.g., MCF-7) using various agents.
  • Analysis of chromatin breakdown in the presence of sera from DNase1-deficient and wild-type mice.
  • Investigation of purified enzymes' effects on necrotic chromatin degradation.

Main Results:

  • Serum DNase1, in conjunction with plasmin, catalyzes necrotic chromatin breakdown, mimicking apoptotic DNA laddering.
  • DNase1 and plasminogen enter necrotic cells, accumulating in cytoplasm and nucleus.
  • Plasminogen activation and subsequent histone H1 degradation by plasmin facilitate DNase1-mediated internucleosomal DNA cleavage.

Conclusions:

  • Serum DNase1 and the plasminogen system ensure efficient chromatin breakdown during necrosis via DNA and protein degradation.
  • Impairment of this clearance mechanism may precipitate antinuclear autoimmunity, as observed in DNase1-deficient mice.

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