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Related Concept Videos

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-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-III: Symptoms and Complications01:24

Asthma-III: Symptoms and Complications

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Asthma, a common chronic respiratory condition, is classified considering the frequency and severity of symptoms alongside lung function impairment. Understanding this classification is essential for appropriate treatment and management. Here's a detailed look at the classification of asthma and its clinical features and complications:
Classification of Asthma
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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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Asthma-I: Introduction01:29

Asthma-I: Introduction

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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
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Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

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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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Related Experiment Video

Updated: May 2, 2026

Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury
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Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury

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The complex relationship between inflammation and lung function in severe asthma.

M L Manni1, J B Trudeau2, E V Scheller1

  • 1Division of Pulmonary Medicine, Allergy and Immunology, Department of Pediatrics, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, Pennsylvania, USA.

Mucosal Immunology
|February 20, 2014
PubMed
Summary
This summary is machine-generated.

This study reveals that while reducing airspace inflammation improves lung compliance in asthma models, it doesn't affect airway hyperresponsiveness (AHR). T-cell driven AHR may link to tissue inflammation.

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An IL-8 Transiently Transgenized Mouse Model for the In Vivo Long-term Monitoring of Inflammatory Responses
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Area of Science:

  • Immunology
  • Respiratory Medicine
  • Allergy Research

Background:

  • Asthma affects 300 million globally, with airway inflammation a suspected driver of pathogenesis.
  • The precise link between inflammation and airway hyperresponsiveness (AHR) in severe asthma remains incompletely understood.
  • Steroid-insensitive asthma presents unique challenges in managing inflammation and AHR.

Purpose of the Study:

  • To investigate the role of inflammation in steroid-insensitive, severe allergic airway disease.
  • To explore the relationship between specific inflammatory profiles and AHR in severe asthmatics.
  • To differentiate the impact of airspace versus tissue inflammation on lung function parameters.

Main Methods:

  • Utilized a T-helper (T(H))-17 cell adoptive transfer mouse model to induce allergic airway inflammation.
  • Administered tumor necrosis factor (TNF)-α neutralization and neutrophil depletion to modulate inflammation in mice.
  • Analyzed sputum samples from 41 severe asthmatics, stratifying them by inflammatory cell counts (neutrophils, eosinophils) and cytokine levels.

Main Results:

  • In the mouse model, reduced airspace inflammation via TNFα neutralization or neutrophil depletion improved lung compliance but not AHR.
  • Tissue inflammation persisted despite reduced airspace inflammation, correlating with persistent AHR.
  • Severe asthmatics with high neutrophils and low eosinophils showed elevated T(H)17-related cytokines without worsened lung function.

Conclusions:

  • Lung compliance may be associated with airspace cellular inflammation, while T-cell driven AHR is linked to tissue inflammation.
  • Specific inflammatory phenotypes in severe asthma, such as neutrophilic with low eosinophils, may have distinct underlying mechanisms.
  • Targeting T(H)17 pathways or tissue inflammation warrants further investigation for managing steroid-insensitive asthma and AHR.