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Related Concept Videos

Chronic Obstructive Pulmonary Disease II: Emphysema01:23

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.
Elastin is Responsible for Tissue Elasticity01:12

Elastin is Responsible for Tissue Elasticity

Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations01:19

Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations

Chronic Obstructive Pulmonary Disease, or COPD, is a long-term condition marked by persistent and only partially reversible airflow limitation. It involves two overlapping conditions—chronic bronchitis and emphysema—which often co-appear but differ in dominant symptoms and underlying mechanisms.Chronic Bronchitis FeaturesChronic bronchitis presents with a persistent productive cough and thick, sometimes purulent mucus due to airway inflammation, enlarged mucus glands, and goblet cell...
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 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-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

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Related Experiment Video

Updated: Jun 24, 2026

Quantifying the Modulation of Elastase Enzyme Activity Through Colorimetric Analysis
04:30

Quantifying the Modulation of Elastase Enzyme Activity Through Colorimetric Analysis

Published on: January 17, 2025

Elastin expression in very severe human COPD.

G Deslee1,2, J C Woods3,4, C M Moore1

  • 1Dept of Internal Medicine, Washington University School of Medicine, St Louis, MO, USA.

The European Respiratory Journal
|April 10, 2009
PubMed
Summary
This summary is machine-generated.

In very severe chronic obstructive pulmonary disease (COPD), elastin gene expression is significantly increased in the lungs. This suggests a potential repair response to injury in advanced stages of COPD.

Related Experiment Videos

Last Updated: Jun 24, 2026

Quantifying the Modulation of Elastase Enzyme Activity Through Colorimetric Analysis
04:30

Quantifying the Modulation of Elastase Enzyme Activity Through Colorimetric Analysis

Published on: January 17, 2025

Area of Science:

  • Pulmonary Medicine
  • Molecular Biology
  • Pathogenesis of Lung Diseases

Background:

  • Alveolar elastic fibres are crucial in lung structure and function.
  • Protease activity targeting elastic fibres contributes to chronic obstructive pulmonary disease (COPD) pathogenesis.
  • The role of elastin gene expression in severe COPD remains unclear.

Purpose of the Study:

  • To investigate elastin gene expression in the lungs of patients with very severe COPD.
  • To determine if elastin expression is upregulated as a response to injury in severe COPD.
  • To correlate elastin expression with structural changes in alveolar elastic fibres.

Main Methods:

  • Analysis of lung tissue samples from patients with varying stages of COPD and healthy donors.
  • Quantification of elastin mRNA expression using real-time RT-PCR.
  • Localization of elastin gene expression via in situ hybridization.
  • Assessment of alveolar elastic fibre volume fraction and desmosine content.

Main Results:

  • Elastin mRNA expression was significantly elevated (12-fold) in very severe COPD lungs compared to controls.
  • In situ hybridization confirmed increased elastin expression localized to alveolar walls in severe COPD.
  • Alveolar elastic fibres occupied a greater volume fraction of lung tissue in very severe COPD.
  • No significant increase in overall elastic fibre content per lung volume or desmosine content was observed.

Conclusions:

  • The study demonstrates enhanced alveolar elastin gene expression in very severe COPD.
  • This upregulation may represent a compensatory or repair mechanism in response to lung injury.
  • Further research is needed to elucidate the efficiency and regulation of this elastin expression response.