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Quantitative In vitro Assay to Measure Neutrophil Adhesion to Activated Primary Human Microvascular Endothelial Cells under Static Conditions
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Quantitative In vitro Assay to Measure Neutrophil Adhesion to Activated Primary Human Microvascular Endothelial Cells under Static Conditions

Published on: August 23, 2013

Interleukin-8 activates microtubule-associated protein 2 kinase (ERK1) in human neutrophils

J Van Lint1, J Van Damme, A Billiau

  • 1Afdeling Biochemie, Faculteit Geneeskunde, Leuven, Belgium.

Molecular and Cellular Biochemistry
|November 1, 1993
PubMed

Insights

Interleukin-8 (IL-8) activates extracellular signal-regulated kinase 1 (ERK1) in neutrophils, a key step in cell movement. This finding reveals ERK1

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Interleukin-8 (IL-8) is a primary chemotactic cytokine for neutrophils.
  • Neutrophil chemotaxis is crucial for immune responses.
  • Protein kinase activation is a common signaling pathway.

Purpose of the Study:

  • To investigate the signal transduction pathway initiated by IL-8.
  • To identify the specific protein kinases involved in IL-8-mediated neutrophil chemotaxis.
  • To compare IL-8 signaling with bacterial peptide signaling.

Main Methods:

  • Assessed protein kinase activation in response to IL-8.
  • Characterized the activated kinase using substrate specificity, molecular weight, and antibody recognition.
  • Examined neutrophil chemotaxis induced by fMet-Leu-Phe (fMLP).

Main Results:

  • IL-8 induced a transient, dose- and time-dependent activation of a Ser/Thr kinase.
  • The activated kinase was identified as extracellular signal-regulated kinase 1 (ERK1).
  • Neutrophil chemotaxis to fMLP also involved activation of a similar ERK enzyme.

Conclusions:

  • ERK1 activation by IL-8 is a key component of neutrophil chemotaxis.
  • ERK enzymes play roles beyond mitogenic signaling in differentiated cells.
  • Chemotaxis induced by both cytokines and bacterial peptides involves ERK regulation.

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