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Updated: Jun 16, 2026
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Methods to Evaluate Cytotoxicity and Immunosuppression of Combustible Tobacco Product Preparations
Published on: January 10, 2015
Cigarette smoke-induced pulmonary endothelial dysfunction is partially suppressed by sildenafil
Javier Milara1, Gustavo Juan, Jose L Ortiz
1Research Unit, University General Hospital Consortium, Valencia, Spain. xmilara@hotmail.com
Summary
Phosphodiesterase type 5 (PDE5) inhibition lessens oxidative stress and inflammation in human pulmonary artery endothelial cells exposed to cigarette smoke extract. This suggests PDE5 inhibitors may benefit lung disorders involving endothelial dysfunction.
Area of Science:
- Cardiovascular Biology
- Pulmonary Medicine
- Cellular Biology
Background:
- Cigarette smoke causes oxidative stress and endothelial dysfunction, contributing to lung diseases.
- Pulmonary artery endothelial cells (HPAEC) are central to these pathological processes.
Purpose of the Study:
- To investigate the protective effects of phosphodiesterase type 5 (PDE5) inhibition on cigarette smoke extract (CSE)-induced endothelial dysfunction in HPAEC.
- To elucidate the mechanisms underlying PDE5 inhibition's impact on CSE-induced cellular damage.
Main Methods:
- HPAEC were treated with PDE5 inhibitor sildenafil, a PKG agonist, or antioxidants before exposure to CSE.
- Assessed reactive oxygen species (ROS) generation, nitric oxide (NO) levels, cyclic guanosine monophosphate (cGMP) intracellular levels, and gene expression (pg91(phox), PDE5, IL-6, IL-8, Ang-1, Ang-2).
- Apoptosis was evaluated following CSE exposure.
Main Results:
- Sildenafil and antioxidants partially reversed CSE-induced ROS generation and normalized NO and cGMP levels.
- Sildenafil and DPI suppressed CSE-induced pg91(phox) and PDE5 mRNA overexpression.
- Sildenafil, 8-Br-cGMP, DPI, and NAC partially mitigated CSE-induced inflammatory marker upregulation (IL-6, IL-8, Ang-2), decreased Ang-1 expression, and reduced apoptosis.
Conclusions:
- PDE5 inhibition effectively attenuates oxidative stress, inflammation, and remodeling in HPAEC exposed to CSE.
- These findings support the potential therapeutic role of PDE5 inhibitors in managing pulmonary disorders characterized by endothelial dysfunction.
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