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Myeloperoxidase directs properdin-mediated complement activation.

Joseph O'Flynn1, Karen O Dixon, Maria C Faber Krol

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Neutrophil myeloperoxidase (MPO) binds properdin, initiating alternative pathway complement activation. This interaction leads to C3 and C5b-9 deposition, offering insights into neutrophil-mediated diseases.

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Area of Science:

  • Immunology
  • Innate Immunity
  • Complement System

Background:

  • Neutrophils and the alternative pathway (AP) of complement are crucial innate immunity components.
  • AP is implicated in neutrophil-mediated diseases, but the interaction mechanism with neutrophils is unclear.
  • The AP involves C3, factor B, factor D, and properdin, amplifying activation.

Purpose of the Study:

  • To investigate the interaction between the alternative pathway and neutrophil components.
  • To determine if neutrophil enzymes can bind and activate complement components.
  • To elucidate the role of myeloperoxidase (MPO) in AP activation.

Main Methods:

  • Studied the binding of neutrophil enzymes (MPO, PR3, azurocidin, elastase, lysozyme, cathepsin G) to properdin.
  • Assessed C3 activation mediated by MPO in the presence of MgEGTA versus EDTA.
  • Investigated properdin's requirement for MPO-induced complement activation and C3/C5b-9 deposition.

Main Results:

  • Most tested neutrophil enzymes, except azurocidin, bound properdin.
  • Only MPO induced C3 activation, demonstrating MgEGTA-dependent AP complement activation.
  • MPO directly binds properdin, facilitating AP activation and subsequent C3 and C5b-9 deposition.

Conclusions:

  • Properdin directly interacts with neutrophil components, particularly MPO.
  • MPO activates the alternative pathway complement in a properdin-dependent manner.
  • MPO induces properdin-initiated C3 and C5b-9 deposition in vitro.