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Related Concept Videos

Chronic Obstructive Pulmonary Disease I: Introduction01:23

Chronic Obstructive Pulmonary Disease I: Introduction

Chronic obstructive pulmonary disease is a common, preventable, and treatable respiratory disorder characterized by persistent symptoms and progressive airflow limitation. This limitation results from a combination of small-airway disease (obstructive bronchiolitis) and parenchymal destruction (emphysema), both driven by chronic inflammation from exposure to harmful particles or gases.The disease includes two main pathological entities: emphysema, marked by destruction of alveolar walls and...
Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

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
Chronic Obstructive Pulmonary Disease-I: Introduction01:20

Chronic Obstructive Pulmonary Disease-I: Introduction

Chronic Obstructive Pulmonary Disease (COPD) is a long-lasting respiratory condition requiring continuous attention and care. It is a progressive lung disease that leads to breathing challenges due to airflow obstruction. It manifests as persistent respiratory symptoms and restricted airflow resulting from abnormalities in the airways and alveoli, usually due to long-term exposure to harmful particles or gases. COPD mainly consists of two primary conditions: emphysema and chronic bronchitis.
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

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...
COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
Chronic Obstructive Pulmonary Disease01:24

Chronic Obstructive Pulmonary Disease

COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...

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Related Experiment Video

Updated: Jun 21, 2026

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure
08:17

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure

Published on: August 25, 2017

A hypothesis for the initiation of COPD.

E G Tzortzaki1, N M Siafakas

  • 1Department of Thoracic Medicine, University Hospital, Medical School, University of Crete, Heraklion 71110, Greece. tzortzaki@med.uoc.gr

The European Respiratory Journal
|August 4, 2009
PubMed
Summary

This study proposes a new hypothesis for chronic obstructive pulmonary disease (COPD) initiation: oxidative DNA damage in lung epithelial barrier cells (LEBCs) triggers an immune response. This involves altered LEBCs being recognized by dendritic cells, leading to T-lymphocyte proliferation and inflammation.

Related Experiment Videos

Last Updated: Jun 21, 2026

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure
08:17

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure

Published on: August 25, 2017

Area of Science:

  • Pulmonology
  • Immunology
  • Genetics

Background:

  • Chronic obstructive pulmonary disease (COPD) involves chronic inflammation, but its initiation is not fully understood.
  • Current understanding suggests an aberrant immune response to noxious agents causes COPD.
  • The precise trigger for this abnormal immune response remains unclear.

Purpose of the Study:

  • To propose a novel hypothesis for the initiation of chronic obstructive pulmonary disease (COPD).
  • To elucidate the role of oxidative DNA damage in lung epithelial barrier cells (LEBCs) in COPD pathogenesis.
  • To describe the subsequent immune cascade triggered by damaged LEBCs.

Main Methods:

  • The study presents a hypothetical model for COPD initiation.
  • It outlines a sequence of events starting with cigarette smoke-induced oxidative DNA damage in LEBCs.
  • The model details immune cell interactions, including dendritic cells and T-lymphocytes.

Main Results:

  • Cigarette smoke is hypothesized to cause oxidative DNA damage in LEBCs.
  • This damage leads to altered LEBCs expressing mutations at the microsatellite DNA level.
  • Altered LEBCs are recognized as foreign by dendritic cells, initiating an immune response involving CD8+ cytotoxic T-lymphocytes.

Conclusions:

  • The proposed model suggests oxidative DNA damage in LEBCs is a key initiator of COPD.
  • This damage triggers an immune response directed at airway epithelium.
  • Further experimental validation is required to confirm this hypothesis for COPD inflammation.