Nov 16, 2018

Airway Mucin Secretion

Annals of the American Thoracic Society
Ana M JaramilloBurton F Dickey

Abstract

Exocytosis of secreted mucins is the final step in their intracellular processing, resulting in their release into the airway lumen to interact with water and ions to form mucus. Mucins are secreted at a low baseline rate and a high stimulated rate, and both rates are regulated by second messengers acting on components of the exocytic machinery. The principal physiologic function of the low baseline rate is to support steady-state mucociliary clearance of inhaled particles and pathogens that enter the airways during normal breathing. Even in the setting of mucin hyperproduction, baseline secretion generally does not induce mucus occlusion. The principal physiologic function of the high stimulated rate of secretion from both submucosal glands and surface goblet cells in proximal airways appears to be to sweep away larger particles, whereas in distal airways it appears to act in concert with mucin hyperproduction to induce mucus occlusion to trap migrating helminths. Pathophysiologically, stimulated mucin secretion in the setting of mucin hyperproduction from allergic or other types of airway inflammation in the absence of helminth infection causes airflow obstruction and infection. Molecular components of the mucin exocytic mach...Continue Reading

  • References36
  • Citations6

References

  • References36
  • Citations6

Citations

Mentioned in this Paper

Chronic Airflow Obstruction
Size
Entire Lumen of Body System
Normal Respiratory Function
Regulation of Biological Process
Mucin-1 protein
Metal Working Fluid
Submucosal Route of Drug Administration
Protoplasm
Second messenger

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