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In vitro Measurements of Tracheal Constriction Using Mice
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In vitro Measurements of Tracheal Constriction Using Mice

Published on: June 25, 2012

Regulation of particulate matter-induced mucin secretion by transient receptor potential vanilloid 1 receptors

Hongmei Yu1, Qi Li, Victor P Kolosov

  • 1Division of Respiratory Medicine, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400010, China.

Inflammation
|July 26, 2012
PubMed

Insights

Airborne particulate matter (PM) triggers mucin secretion in airway cells via TRPV1 channels, increasing intracellular calcium and cAMP. Blocking these pathways offers a potential strategy to mitigate PM-induced respiratory issues.

Area of Science:

  • * Respiratory biology
  • * Environmental toxicology
  • * Cellular physiology

Background:

  • * Airborne particulate matter (PM) exposure is a significant global health concern.
  • * PM exposure is linked to increased intracellular calcium (Ca2+) in human bronchial epithelial cells.
  • * Mucin hypersecretion, regulated by Ca2+, is a hallmark of inflammatory respiratory diseases.

Purpose of the Study:

  • * To investigate the mechanisms by which PM induces mucin secretion in human bronchial epithelial (16HBE) cells.
  • * To identify the specific cellular pathways involved in PM-mediated mucin release.

Main Methods:

  • * Measurement of MUC5AC secretion and cyclic adenosine monophosphate (cAMP) levels using ELISA.
  • * Electrophysiological examination of Transient Receptor Potential Vanilloid (TRPV)1 currents.
  • * Assessment of intracellular Ca2+ concentration via laser scanning confocal microscopy.
  • * Pharmacological inhibition of TRPV1, Ca2+ influx, and the cAMP/Protein Kinase A (PKA) pathway.

Main Results:

  • * PM exposure stimulated MUC5AC secretion in 16HBE cells.
  • * This secretion was dependent on sustained Ca2+ influx and increased cAMP levels mediated by TRPV1 receptors.
  • * Complete inhibition of mucin secretion was achieved using the TRPV1 antagonist capsazepine.
  • * Partial reduction in secretion was observed with Ca2+ chelation (BAPTA) or PKA inhibition (H-89).
  • * Combined inhibition of Ca2+ and PKA completely abolished PM-induced mucin secretion.

Conclusions:

  • * PM induces mucin secretion in human bronchial epithelial cells through activation of TRPV1 receptors.
  • * The process involves Ca2+ influx and the cAMP/PKA signaling pathway.
  • * Targeting the TRPV1 receptor and associated pathways presents a potential therapeutic strategy for reducing PM toxicity in the airways.

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