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Related Concept Videos

Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
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Cystic Fibrosis: Management01:24

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Cystic fibrosis (CF) is an autosomal recessive disorder that predominantly affects individuals of Northern European descent, occurring at a rate of 1 in 3500. It is caused by a genetic mutation in a gene on chromosome 7, most commonly the ΔF508 mutation, that codes for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. This results in thicker mucus secretions and obstruction pathologies in multiple organs, including the lungs and sinuses.
Sinus disease and chronic...
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Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer
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Nanoscale Viscometry Reveals an Inherent Mucus Defect in Cystic Fibrosis.

Olga Ponomarchuk1, Francis Boudreault1, Ignacy Gryczynski2

  • 1Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec H2X 0A9, Canada.

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Summary

Cystic fibrosis (CF) mucus is abnormally thick due to high presecretory mucin nanoviscosity within granules. This intrinsic defect, potentially caused by overcrowding, impacts mucus structure and function after secretion.

Keywords:
CFTRbronchial epithelial cellsmolecular viscometermucin granuleviscosity

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Area of Science:

  • Biophysics
  • Cell Biology
  • Mucology

Background:

  • Cystic fibrosis (CF) is characterized by abnormally viscous mucus.
  • The precise mechanisms causing aberrant mucus in CF remain unclear.
  • Mucus is formed by hydrated mucin macromolecules stored in intracellular granules.

Purpose of the Study:

  • To investigate the presecretory and postsecretory nanoviscosity of mucins in cystic fibrosis.
  • To explore the structural organization of mucins before and after secretion.
  • To identify potential therapeutic targets for CF-associated mucus dysfunction.

Main Methods:

  • Utilized a molecular viscometer and fluorescence lifetime imaging.
  • Measured nanometer-scale viscosity in human bronchoepithelial cells (Normal and CF).
  • Analyzed intraluminal nanoviscosity within mucin granules and secreted mucus.

Main Results:

  • Significantly elevated intraluminal nanoviscosity was observed in CF mucin granules, indicating a presecretory defect.
  • Secreted CF mucus exhibited higher nanoviscosity than non-CF mucus and was higher post-secretion than in granules.
  • Reduced water mobility hydrating mucins may contribute to high nanoviscosity, suggesting a shift from a weakly ordered state in granules to a crystalline structure upon secretion.

Conclusions:

  • CF exhibits an intrinsic, presecretory mucin defect characterized by elevated nanoviscosity.
  • Mucin organization differs significantly from traditional models, adopting a nematic crystalline structure upon secretion.
  • Targeting presecretory mechanisms offers a promising therapeutic strategy for CF and other muco-obstructive lung diseases.