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Isolation of Mouse Respiratory Epithelial Cells and Exposure to Experimental Cigarette Smoke at Air Liquid Interface
Published on: February 21, 2011
Cigarette smoke exposure alters phosphodiesterases in human structural lung cells
Haoxiao Zuo1,2,3, Alen Faiz2,4,5,6, Maarten van den Berge2,4
1University of Groningen, Department of Molecular Pharmacology, Groningen, The Netherlands.
Abstract:
Cigarette smoke (CS), a highly complex mixture containing more than 4,000 compounds, causes aberrant cell responses leading to tissue damage around the airways and alveoli, which underlies various lung diseases. Phosphodiesterases (PDEs) are a family of enzymes that hydrolyze cyclic nucleotides. PDE inhibition induces bronchodilation, reduces the activation and recruitment of inflammatory cells, and the release of various cytokines. Currently, the selective PDE4 inhibitor roflumilast is an approved add-on treatment for patients with severe chronic obstructive pulmonary disease with chronic bronchitis and a history of frequent exacerbations. Additional selective PDE inhibitors are being tested in preclinical and clinical studies. However, the effect of chronic CS exposure on the expression of PDEs is unknown. Using mRNA isolated from nasal and bronchial brushes and lung tissues of never smokers and current smokers, we compared the gene expression of 25 PDE coding genes. Additionally, the expression and distribution of PDE3A and PDE4D in human lung tissues was examined. This study reveals that chronic CS exposure modulates the expression of various PDE members. Thus, CS exposure may change the levels of intracellular cyclic nucleotides and thereby impact the efficiency of PDE-targeted therapies.
Insights
Cigarette smoke alters the expression of phosphodiesterase (PDE) genes in the lungs. This finding is crucial for understanding how smoking impacts PDE-targeted therapies for lung diseases.
Area of Science:
- Pulmonary Medicine
- Molecular Biology
- Pharmacology
Background:
- Cigarette smoke (CS) causes lung damage and disease through complex chemical interactions.
- Phosphodiesterases (PDEs) are enzymes that regulate cyclic nucleotides; PDE inhibitors are used in treating lung diseases like COPD.
- The impact of chronic CS exposure on PDE gene expression remains largely unknown.
Purpose of the Study:
- To investigate the effect of chronic cigarette smoke exposure on the gene expression of 25 phosphodiesterase (PDE) members.
- To examine the expression and distribution of PDE3A and PDE4D in human lung tissues from smokers and non-smokers.
Main Methods:
- Gene expression analysis of 25 PDE coding genes using mRNA from nasal, bronchial, and lung tissues.
- Immunohistochemical examination of PDE3A and PDE4D expression and distribution in human lung tissues.
Main Results:
- Chronic cigarette smoke exposure significantly modulates the expression of various PDE gene members in the respiratory tract.
- Specific changes in PDE expression patterns were observed in lung tissues of current smokers compared to never-smokers.
Conclusions:
- Cigarette smoke exposure alters PDE expression, potentially affecting intracellular cyclic nucleotide levels.
- These alterations in PDE expression may influence the efficacy of current and future PDE-targeted therapies for smoking-related lung conditions.
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