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MUC5B secretion is up-regulated in sinusitis compared with controls.

Harishnath Viswanathan1, Iain A Brownlee, Jeffrey P Pearson

  • 1Department of Otolaryngology, The Freeman Hospital, Newcastle upon Tyne, United Kingdom. harishnath@hotmail.com

American Journal of Rhinology
|October 27, 2006
PubMed
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Mucin secretion, specifically MUC5B, is elevated in chronic rhinosinusitis (CRS), disrupting the correlation between mucus viscosity and mucin content. This finding offers new avenues for targeted CRS therapies.

Area of Science:

  • Biochemistry
  • Biophysics
  • Rhinology

Background:

  • Airway mucus, composed mainly of mucins, acts as a protective barrier.
  • Mucins are crucial for the rheologic properties of mucus.
  • Mucus hyperproduction is a hallmark of chronic rhinosinusitis (CRS).

Purpose of the Study:

  • To quantify sinus mucus mucin secretion in healthy individuals and CRS patients.
  • To correlate mucin levels with the biophysical properties of mucus.
  • To understand CRS pathophysiology and inform targeted treatments.

Main Methods:

  • Collected 27 sinus mucus samples from 21 subjects (14 CRS, 7 controls).
  • Measured mucus biophysical properties using rheometry.
  • Quantified MUC5AC and MUC5B mucin content via ELISA.

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Main Results:

  • MUC5B secretion was significantly higher in CRS patients (0.49 microg/mL) compared to controls (0.17 microg/mL).
  • MUC5AC secretion showed no significant difference between groups.
  • A linear correlation between viscosity and mucin content was observed in controls but not in CRS patients.

Conclusions:

  • MUC5B up-regulation in CRS is a key finding.
  • The loss of correlation between viscosity and mucin content in CRS is significant.
  • These findings have potential implications for developing novel CRS therapies.