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TRPV1 Channel in Human Eosinophils: Functional Expression and Inflammatory Modulation.

Tobias Weihrauch1, Natalie Gray1,2, Daniela Wiebe1

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|February 10, 2024
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Summary

Human eosinophils express functional TRPV1 channels, influencing immune cell function and survival. These channels are upregulated in inflammatory conditions like atopic dermatitis, suggesting a role in neuroimmune interactions.

Keywords:
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Area of Science:

  • Immunology
  • Neuroscience
  • Cell Biology

Background:

  • Transient receptor potential vanilloid 1 (TRPV1) is a cation channel found on sensory neurons and immune cells.
  • Its role in human eosinophil function and modulation by inflammation is not well understood.

Purpose of the Study:

  • To investigate the expression and function of TRPV1 in human eosinophils.
  • To determine if TRPV1 is modulated by inflammatory conditions, particularly atopic dermatitis (AD).

Main Methods:

  • Quantitative PCR (qPCR), flow cytometry, and immunohistochemistry were used to examine TRPV1 expression.
  • Calcium flux, apoptosis, cytokine modulation, acidic pH effects, and CD69 externalization were assessed via flow cytometry to analyze TRPV1 functionality.

Main Results:

  • TRPV1 activation led to calcium influx and prolonged eosinophil survival.
  • While TRPV1 agonists did not directly activate eosinophils, IL-3 or GM-CSF activation was primarily observed in TRPV1-positive eosinophils.
  • Extracellular acidification and inflammatory cytokines (IL-3, IL-31, IL-33, TSLP, TNF-α, BDNF, NGF-β) increased TRPV1 surface expression.
  • TRPV1-expressing eosinophils were found near peripheral nerves in atopic dermatitis skin.

Conclusions:

  • Human eosinophils express functional TRPV1 channels.
  • TRPV1 expression is enhanced by acidic pH and AD-related cytokines.
  • The presence of TRPV1 on eosinophils in AD skin suggests a role in neuroimmune communication in inflammatory skin diseases.