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Related Experiment Videos

Secretoneurin and chemoattractant receptor interactions

C Kong1, B M Gill, R Rahimpour

  • 1Laboratory of Molecular Inflammation and Immunology, Robarts Research Institute, London, Ontario, Canada.

Journal of Neuroimmunology
|August 4, 1998
PubMed
Summary

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Secretoneurin (SN) is a peptide that attracts monocytes via a novel receptor. This interaction involves signaling pathways sensitive to cholera toxin and pertussis toxin.

Area of Science:

  • Immunology
  • Cell Biology
  • Neuroendocrinology

Background:

  • Secretoneurin (SN) is a peptide derived from secretogranin II.
  • SN is known to induce chemotaxis in monocytes but not neutrophils.

Purpose of the Study:

  • To investigate the mechanism of SN-induced monocyte chemotaxis.
  • To identify the receptor and signaling pathways involved in SN's action on monocytes.

Main Methods:

  • Monocyte binding assays using radiolabeled SN.
  • Competition assays with known chemoattractants (MCP-1, MCP-2, fMLP).
  • Intracellular calcium (Ca2+) measurements.
  • Inhibition studies using cholera toxin (CT) and pertussis toxin (PT).
  • Chemotactic desensitization experiments.

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Main Results:

  • SN binds to specific cell surface sites on human monocytes.
  • SN binding sites are distinct from those of MCP-1, MCP-2, and fMLP, suggesting a novel receptor.
  • SN does not induce a rise in cytosolic Ca2+.
  • SN-induced chemotaxis is inhibited by CT and PT.
  • Cross-desensitization observed between SN and other chemoattractants indicates shared or related signaling pathways.

Conclusions:

  • Secretoneurin (SN) binds to a novel cell surface receptor on monocytes.
  • SN activates signaling pathways that are sensitive to cholera toxin (CT) and pertussis toxin (PT).
  • These findings elucidate the molecular mechanisms underlying SN-mediated monocyte recruitment.