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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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01:24Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features
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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...
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01:24Chronic Obstructive Pulmonary Disease
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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.
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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.
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Author Spotlight: Dissection and Isolation of Region-Specific Decellularized Lung Tissue
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Pericytes in chronic lung disease.
Jessica E Rowley1, Jill R Johnson
1Leukocyte Biology Section, National Heart and Lung Institute, Imperial College London, London, UK.
International Archives of Allergy and Immunology
|July 19, 2014
Summary
Pericytes, crucial for microvascular health, are key players in chronic lung diseases. Understanding their transition to myofibroblasts offers new therapeutic targets for pulmonary fibrosis and hypertension.
Area of Science:
- Vascular Biology
- Cell Biology
- Pulmonary Medicine
Background:
- Pericytes are mesenchymal cells supporting microvascular homeostasis and angiogenesis.
- They possess mesenchymal stem cell (MSC) properties, differentiating into osteocytes, chondrocytes, and adipocytes.
- Pericytes are implicated in myofibroblast activation and vascular remodeling in fibrotic lung diseases.
Purpose of the Study:
- To investigate the role of pericytes in chronic lung diseases.
- To explore the mechanisms of pericyte-to-myofibroblast transition and migration.
- To confirm the significance of pericytes in human fibrotic pulmonary disease.
Main Methods:
- Review of existing literature on pericyte function and involvement in lung pathology.
- Analysis of studies investigating pericyte differentiation and fibrotic processes.
Main Results:
- Pericytes are vital in myofibroblast activation and collagen deposition in fibrotic lung conditions.
- Their transition to myofibroblasts contributes to microvascular remodeling.
- Pericytes play a significant role in the pathogenesis of asthma, COPD, pulmonary fibrosis, and hypertension.
Conclusions:
- Pericytes are critical cellular mediators in the development of chronic fibrotic lung diseases.
- Further research into pericyte-myofibroblast transition is essential for understanding and treating these conditions.
- Pericytes represent a promising therapeutic target for human fibrotic pulmonary diseases.