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Interleukin-8 antagonists generated by N-terminal modification

B Moser1, B Dewald, L Barella

  • 1Theodor-Kocher Institute, University of Bern, Switzerland.

The Journal of Biological Chemistry
|April 5, 1993
PubMed
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Modifying the N-terminal ELR sequence of interleukin-8 (IL-8) creates potent antagonists. These analogs inhibit IL-8 receptor binding and neutrophil activation, offering targeted control of inflammatory responses.

Area of Science:

  • Immunology
  • Molecular Biology
  • Medicinal Chemistry

Background:

  • The Glu-Leu-Arg (ELR) motif at the N-terminus of interleukin-8 (IL-8) is crucial for its biological activity.
  • Previous studies established the essential role of the ELR sequence in IL-8 receptor binding and neutrophil activation.

Purpose of the Study:

  • To synthesize and evaluate analogs of IL-8(4-72) as potential IL-8 antagonists.
  • To investigate the impact of modifications within the ELR region on IL-8 function.

Main Methods:

  • Synthesis of 26 analogs of IL-8(4-72) with deletions or amino acid replacements in the ELR region.
  • Assay of analog activity in inhibiting IL-8 receptor binding, exocytosis, chemotaxis, and respiratory burst.

Main Results:

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  • Several analogs demonstrated significant inhibition of IL-8 function.
  • The most potent antagonists, IL-8(6-72) and IL-8,AAR(7-72), effectively inhibited IL-8 receptor binding and neutrophil responses.
  • Inhibition was specific to IL-8, GRO alpha, and NAP-2, with no effect on responses to fMet-Leu-Phe or C5a.

Conclusions:

  • Modification of the N-terminal ELR sequence yields selective IL-8 antagonists.
  • These antagonists can attenuate the action of IL-8 and related chemotactic cytokines.
  • Targeted modifications offer a strategy for developing novel anti-inflammatory agents.