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Related Experiment Videos

5-hydroxytryptamine induces mast cell adhesion and migration.

Nataliya M Kushnir-Sukhov1, Alasdair M Gilfillan, John W Coleman

  • 1Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 10 Center Drive, Bethesda, MD 20892, USA. nkushnir@niaid.nih.gov

Journal of Immunology (Baltimore, Md. : 1950)
|October 24, 2006
PubMed
Summary
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Serotonin (5-hydroxytryptamine) enhances inflammation by increasing mast cells (MC) at injury sites. This occurs via the 5-HT(1A) receptor, influencing MC migration and accumulation in tissues.

Area of Science:

  • Immunology
  • Neuroscience
  • Dermatology

Background:

  • Serotonin (5-hydroxytryptamine, 5-HT) is known to enhance inflammatory responses in various tissues.
  • The precise mechanisms by which 5-HT influences inflammatory cells, particularly mast cells (MC), remain incompletely understood.

Purpose of the Study:

  • To investigate the role of serotonin (5-HT) in mast cell (MC) function and inflammatory reactions.
  • To determine if 5-HT exerts its effects on MC through specific serotonin receptors.

Main Methods:

  • Expression of 5-HT receptors was analyzed in mouse bone marrow-derived MC (mBMMC) and human CD34(+)-derived MC (huMC).
  • Effects of 5-HT on MC degranulation, adhesion to fibronectin, and chemotaxis were assessed.
  • Receptor antagonists and pertussis toxin were used to identify the mediating receptor; 5-HT(1A) receptor knockout mice were utilized.

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Main Results:

  • 5-HT did not induce MC degranulation or modulate IgE-dependent activation.
  • 5-HT promoted MC adherence to fibronectin and induced migration (chemotaxis) in both mouse and human MC.
  • The 5-HT(1A) receptor was identified as the primary receptor mediating these effects, with knockout mice showing no response to 5-HT.
  • 5-HT increased MC accumulation in mouse dermis, an effect absent in knockout mice.

Conclusions:

  • These findings demonstrate for the first time that serotonin (5-HT) directly affects mast cells (MC).
  • Both mouse and human MC respond to 5-HT via the 5-HT(1A) receptor.
  • Serotonin promotes inflammation by increasing mast cell presence at sites of tissue injury.