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Related Experiment Videos

Hepoxilin binding in human neutrophils

D Reynaud1, P Demin, C R Pace-Asciak

  • 1Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada.

Biochemical and Biophysical Research Communications
|February 6, 1995
PubMed
Summary

Human neutrophils possess specific binding sites for hepoxilins, a type of lipid signaling molecule. These binding sites appear to be intracellular, and neutrophils can also synthesize hepoxilins.

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Area of Science:

  • Immunology
  • Lipid Signaling
  • Cell Biology

Background:

  • Hepoxilins are known to release intracellular calcium in human neutrophils.
  • Understanding hepoxilin interactions with neutrophils is crucial for inflammatory response research.

Purpose of the Study:

  • To investigate the specific binding of hepoxilin A3 to human neutrophils.
  • To determine the cellular location of hepoxilin binding sites.
  • To explore the capacity of neutrophils for hepoxilin synthesis.

Main Methods:

  • Utilized tritium-labeled hepoxilin A3 to assess binding to human neutrophils.
  • Examined binding in both intact cells and broken membrane fragments.
  • Incubated neutrophils with the hepoxilin precursor 12(S)-HPETE to study synthesis.

Main Results:

  • Demonstrated specific binding of hepoxilin A3 to human neutrophils, reversible by unlabeled compound.
  • Found that both methyl ester and free acid forms bind to broken membranes, but only the ester binds to intact cells.
  • Confirmed that intact neutrophils synthesize hepoxilin A3 from 12(S)-HPETE.

Conclusions:

  • Human neutrophils exhibit specific binding sites for hepoxilins.
  • These binding sites are likely located intracellularly.
  • Neutrophils are capable of synthesizing hepoxilins, suggesting an autocrine or paracrine role in neutrophil function.

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