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Related Experiment Videos

Human neutrophil elastase abolishes interleukin-8 chemotactic activity

K J Leavell1, M W Peterson, T J Gross

  • 1Department of Internal Medicine, University of Iowa College of Medicine, Iowa City 52242, USA.

Journal of Leukocyte Biology
|March 1, 1997
PubMed
Summary

Human neutrophil elastase (HNE) degrades interleukin-8 (IL-8), a key inflammatory chemokine. This proteolysis inactivates IL-8, suggesting a novel mechanism to control inflammatory lung disease.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Pulmonary Medicine

Background:

  • Interleukin-8 (IL-8) is a critical chemokine in inflammatory lung diseases, attracting polymorphonuclear leukocytes.
  • The fate and regulation of IL-8 at inflammatory sites are not well understood.

Purpose of the Study:

  • To investigate the degradation of IL-8 by human neutrophil elastase (HNE).
  • To determine if HNE affects IL-8's biological activity and structure.

Main Methods:

  • Incubation of recombinant human IL-8 with purified HNE.
  • Assays for IL-8 chemotactic activity and immunoreactivity.
  • Western blot analysis to detect IL-8 fragments.
  • Comparison with other serine proteases (urokinase, plasmin, thrombin, cathepsin G).

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Main Results:

  • HNE dose- and time-dependently abolished IL-8 chemotactic activity and immunoreactivity.
  • Western blots showed IL-8 was proteolyzed into small fragments by HNE.
  • HNE's effect was specific, as other proteases did not degrade IL-8.
  • HNE also degraded IL-8 secreted by human monocytes.

Conclusions:

  • Human neutrophil elastase specifically degrades and inactivates IL-8.
  • HNE-mediated proteolysis represents a novel mechanism for down-regulating IL-8-driven inflammation.