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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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Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
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The gastric glands contain parietal cells that secrete hydrochloric acid (HCl) for digestion. The cells secrete HCl because it is highly corrosive and essential for breaking down food. To achieve this, they secrete hydrogen and chloride ions into the lumen of the gastric glands, which combine to form HCl.
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Drugs Used in Upper Respiratory Disorders: Overview01:16

Drugs Used in Upper Respiratory Disorders: Overview

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Upper respiratory tract disorders, including viral infections and allergic rhinitis, cause significant discomfort and disrupt daily life. Managing these conditions involves a variety of drugs, such as antihistamines, intranasal steroids, decongestants, antitussives, expectorants, and mucolytics. Specific examples of drugs in each category are provided.
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Mucins and CFTR: Their Close Relationship.

Kenichi Okuda1, Kendall M Shaffer1, Camille Ehre1,2

  • 1Marsico Lung Institute, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

International Journal of Molecular Sciences
|September 23, 2022
PubMed
Summary

Cystic fibrosis (CF) impairs lung defense by affecting mucociliary clearance. New research reveals a link between CFTR function, mucin production (MUC5AC, MUC5B), and airway mucus properties.

Keywords:
CFTRairway clearancecystic fibrosis (CF)mucinsmucuspolymeric networksingle-cell transcriptomicsviscoelasticity

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Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Genetics

Background:

  • Mucociliary clearance is vital for lung health, involving mucin secretion, cilia beating, and ion transport.
  • Cystic fibrosis (CF) results from cystic fibrosis transmembrane conductance regulator (CFTR) dysfunction, leading to impaired mucociliary clearance and abnormal mucus.
  • While CFTR modulator therapies have improved quality of life, understanding CFTR-mucus interactions is crucial for new treatments.

Purpose of the Study:

  • To explore the relationship between CFTR and secretory mucins (MUC5AC, MUC5B) in the lungs.
  • To review how mucin secretion and CFTR-mediated ion transport maintain airway mucus homeostasis.
  • To examine the impact of CFTR dysfunction and restoration on mucus properties.

Main Methods:

  • Single-cell transcriptome analysis to investigate gene expression.
  • Review of recent findings on airway mucus biochemical and biophysical properties.

Main Results:

  • Single-cell transcriptomics revealed an unexpected connection between MUC5AC, MUC5B mucins, and CFTR in lung tissue.
  • The study highlights the integrated roles of mucin secretion and CFTR ion transport in maintaining airway mucus.

Conclusions:

  • CFTR dysfunction significantly impacts airway mucus properties.
  • Further research into CFTR and mucus interactions is essential for developing targeted therapies for cystic fibrosis.