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Related Concept Videos

Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

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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.
Asthma is classified as allergic and non-allergic. Allergens such as dust mites, pollen, and pet dander trigger allergic asthma, while factors like cold air, intense emotions, or exercise can induce non-allergic asthma.
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Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

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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:
Chronic Inflammation
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Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
Critical processes in asthma pathophysiology include:
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Asthma I: Introduction01:28

Asthma I: Introduction

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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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Asthma III: Clinical Manifestations01:13

Asthma III: Clinical Manifestations

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Asthma presents with a characteristic pattern of episodic respiratory symptoms that reflect underlying airway inflammation, bronchoconstriction, and mucus hypersecretion. Although severity varies among individuals, certain clinical manifestations are considered hallmarks of the disorder and often guide diagnosis and assessment.Respiratory SymptomsA persistent cough is one of the most common early features of asthma. It is frequently dry and tends to worsen at night or in the early morning,...
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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

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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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Isolating Bronchial Epithelial Cells from Resected Lung Tissue for Biobanking and Establishing Well-Differentiated Air-Liquid Interface Cultures
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Epithelium dysfunction in asthma.

Stephen T Holgate1

  • 1Allergy and Inflammation Research, Division of Infection, School of Medicine, Southampton General Hospital and the University of Southampton, Southampton, United Kingdom. sth@soton.ac.uk

The Journal of Allergy and Clinical Immunology
|December 13, 2007
PubMed
Summary
This summary is machine-generated.

Asthma involves airway inflammation and impaired epithelial barrier function. Targeting this barrier offers new therapeutic strategies beyond immune suppression for chronic airway diseases.

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Area of Science:

  • Respiratory Medicine
  • Immunology
  • Cell Biology

Background:

  • Asthma is characterized by T(H)2-type T cell inflammation in conducting airways.
  • Increasing evidence highlights the epithelium's role in orchestrating asthma's inflammatory response and chronic wound scenario.
  • Impaired epithelial barrier function, due to disrupted tight junctions, allows inhaled substances to trigger airway inflammation.

Purpose of the Study:

  • To explore the role of airway epithelium in asthma pathogenesis.
  • To investigate how epithelial dysfunction contributes to airway injury, repair, and inflammation.
  • To identify therapeutic targets focused on restoring epithelial barrier function.

Main Methods:

  • Review of existing literature on asthma, airway epithelium, and immune responses.
  • Analysis of mechanisms linking epithelial barrier disruption to inflammation and airway remodeling.
  • Examination of epithelial cell signaling and interactions with environmental factors.

Main Results:

  • Epithelial barrier dysfunction is a key feature of asthma, allowing easier penetration of inhaled irritants.
  • Aberrant epithelial communication generates growth factors promoting airway remodeling and chronic inflammation.
  • Reduced epithelial antioxidant defense and interferon production may increase susceptibility to pollution and viral infections.

Conclusions:

  • Asthma can be viewed as a disease of impaired epithelial barrier function.
  • Therapeutic strategies aimed at enhancing airway barrier resistance present a novel approach to asthma prevention and treatment.
  • Focusing on barrier repair may offer an alternative to solely suppressing immune or inflammatory responses.