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Related Concept Videos

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 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...
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-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 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...
Chronic Inflammation: Introduction01:12

Chronic Inflammation: Introduction

Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...

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Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure
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Inflammatory cells and chronic obstructive pulmonary disease.

Teresa D Tetley1

  • 1Lung Cell Biology, National Heart & Lung Institute, Imperial College, London SW3 6LY, UK. t.tetley@imperial.ac.uk

Current Drug Targets. Inflammation and Allergy
|February 20, 2007
PubMed
Summary

Chronic obstructive pulmonary disease (COPD) involves inflammation from cigarette smoke, with neutrophils and macrophages playing key roles. T-cells, particularly CD8+ cells, also contribute to inflammation and lung tissue damage in COPD patients.

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Area of Science:

  • Pulmonary Medicine
  • Immunology
  • Cell Biology

Background:

  • Chronic obstructive pulmonary disease (COPD) is characterized by persistent inflammation, often exacerbated by cigarette smoke, leading to progressive lung function decline.
  • Understanding the diverse inflammatory patterns across COPD's subtypes (bronchitis, small airways disease, emphysema) is crucial due to varying pathologies.

Purpose of the Study:

  • To elucidate the specific roles of neutrophils, macrophages, and T-lymphocytes in the inflammatory processes underlying COPD.
  • To correlate the presence and activation state of these immune cells with disease severity, smoking status, and pathological features like emphysema.

Main Methods:

  • Analysis of sputum and bronchoalveolar lavage fluid to quantify inflammatory cell populations (neutrophils, macrophages, T-cells).
  • Examination of airway tissue to assess cell distribution and activation markers (e.g., CD4+, CD8+ T-cells).
  • Correlation of immune cell levels and ratios with clinical parameters such as smoking history, airway obstruction, and emphysema severity.

Main Results:

  • Neutrophils predominate in conducting airways, while macrophages are prevalent in small airways and parenchyma, both increasing with COPD severity.
  • Macrophages correlate positively with disease severity, airway obstruction, and emphysema.
  • Increased CD8+ T-cells and an elevated CD8+/CD4+ ratio are observed in COPD lung tissue, linked to smoking history and emphysema progression.
  • Severe emphysema shows marked increases in multiple inflammatory cells, including CD8+ T-cells in the airway lumen, potentially linked to viral infections.

Conclusions:

  • Neutrophils and macrophages are key players in COPD pathogenesis, with distinct distributions and correlations to disease severity.
  • T-cell activation, particularly CD8+ cytotoxic/suppressor T-cells, contributes to apoptosis and tissue damage characteristic of emphysema.
  • Inflammatory cell profiles, especially CD8+ T-cells, are significantly altered in COPD and correlate with disease progression and severity.