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Related Concept Videos

Asthma: Pathogenesis and Management01:20

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Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
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Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
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Asthma I: Introduction01:28

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Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

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Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
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Defective epithelial barrier function in asthma.

Chang Xiao1, Sarah M Puddicombe, Sarah Field

  • 1Synairgen Research Ltd, Southampton General Hospital, Southampton, United Kingdom.

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The bronchial epithelial barrier is compromised in asthma, increasing airway susceptibility to environmental triggers like allergens and smoke. This defect may contribute to asthma development and severity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Respiratory Medicine

Background:

  • Asthma pathogenesis involves gene-environment interactions, with atopy being a risk factor.
  • The bronchial epithelium acts as a barrier, regulated by tight junction (TJ) complexes, to maintain airway homeostasis.
  • Local tissue susceptibility, particularly in the bronchial epithelium, is crucial for asthma expression.

Purpose of the Study:

  • To investigate the hypothesis that abnormal epithelial tight junctions (TJs) in asthma increase airway vulnerability to environmental exposures.
  • To elucidate the link between environmental factors and the compromised airway barrier in asthma.

Main Methods:

  • Assessed TJ localization in bronchial biopsies and epithelial cultures using electron microscopy and immunostaining.
  • Measured transepithelial electrical resistance and macromolecular permeability to evaluate barrier function.
  • Examined the effects of cigarette smoke extract and epidermal growth factor on TJ integrity and barrier function.

Main Results:

  • Asthmatic bronchial biopsies showed patchy TJ disruption.
  • Epithelial cultures from asthmatic donors exhibited significantly lower TJ formation and transepithelial electrical resistance compared to controls.
  • Asthmatic cultures demonstrated increased sensitivity to cigarette smoke extract and higher macromolecular permeability.
  • Epidermal growth factor enhanced TJ formation and protected against smoke-induced barrier disruption in asthmatic cultures.

Conclusions:

  • The bronchial epithelial barrier is compromised in individuals with asthma.
  • This epithelial barrier defect may allow increased passage of allergens and environmental agents into airway tissues.
  • Compromised barrier function may contribute to immune activation and the manifestation of asthma.