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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

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...

Asthma: Pathogenesis and Management

Asthma: Pathogenesis and Management

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.

Asthma-II: Pathophysiology and Classification

Asthma-II: Pathophysiology and Classification

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:

Asthma III: Clinical Manifestations

Asthma III: Clinical Manifestations

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,...

Asthma I: Introduction

Asthma I: Introduction

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...

Chronic Obstructive Pulmonary Disease II: Emphysema

Chronic Obstructive Pulmonary Disease II: Emphysema

Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.

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Related Experiment Video

Updated: Jun 23, 2026

A Reversible, Non-invasive Method for Airway Resistance Measurements and Bronchoalveolar Lavage Fluid Sampling in Mice

A Reversible, Non-invasive Method for Airway Resistance Measurements and Bronchoalveolar Lavage Fluid Sampling in Mice

Published on: April 13, 2010

Asthma persistence versus progression: does airway smooth muscle function predict irreversible airflow obstruction?

Reynold A Panettieri¹

¹Pulmonary, Allergy and Critical Care Division, Airways Biology Initiative, University of Pennsylvania, Philadelphia, Pennsylvania 19104-3403, USA. rap@mail.med.upenn.edu

Allergy and Asthma Proceedings

|May 26, 2009

Summary

Asthma can lead to lung function loss, with persistence or progression potentially linked to airway remodeling. New models may identify biomarkers for better asthma treatment strategies.

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Murine Model of Allergen Induced Asthma

Murine Model of Allergen Induced Asthma

Published on: May 14, 2012

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Last Updated: Jun 23, 2026

A Reversible, Non-invasive Method for Airway Resistance Measurements and Bronchoalveolar Lavage Fluid Sampling in Mice

A Reversible, Non-invasive Method for Airway Resistance Measurements and Bronchoalveolar Lavage Fluid Sampling in Mice

Published on: April 13, 2010

Murine Model of Allergen Induced Asthma

Murine Model of Allergen Induced Asthma

Published on: May 14, 2012

Area of Science:

Pulmonary Medicine
Cellular Biology
Immunology

Background:

Asthma presents diverse phenotypes, including persistent or progressive lung function loss.
The underlying cellular and molecular mechanisms differentiating these asthma phenotypes remain unclear.
Airway remodeling is implicated in asthma persistence and progression, but its direct link is not fully established.

Purpose of the Study:

To explore the mechanisms behind asthma persistence and progression.
To investigate the role of airway remodeling in asthma phenotypes.
To evaluate the utility of in vitro airway smooth muscle (ASM) cell models for understanding corticosteroid sensitivity and bronchodilator response.

Main Methods:

Utilized in vitro cell models with nontransformed human airway smooth muscle (ASM) cells.
Assessed corticosteroid sensitivity and bronchodilator response in ASM cells.
Investigated the impact of interferon and TNF-alpha on corticosteroid insensitivity in ASM.

Main Results:

Human ASM cells are useful for studying corticosteroid sensitivity and bronchodilator response.
Corticosteroid treatment modulates some immunomodulatory functions of ASM.
Combinations of interferon and TNF-alpha induce corticosteroid insensitivity in ASM cells.

Conclusions:

In vitro ASM cell models offer insights into asthma pathophysiology.
Understanding ASM's response to corticosteroids and inflammatory mediators is crucial.
Developing predictive models for corticosteroid sensitivity and bronchodilator unresponsiveness could yield new asthma biomarkers and therapies.