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Allergic lung inflammation induces pulmonary vascular hyperresponsiveness
M Witzenrath1, B Ahrens, S M Kube
1Dept of Internal Medicine, Infectious Diseases and Respiratory Medicine, Charité, Universitätsmedizin Berlin, Schumannstr 20/21, 10117 Berlin, Germany. martin.witzenrath@charite.de
The European Respiratory Journal
|March 31, 2006
Summary
Allergic lung inflammation significantly increases pulmonary arterial pressure responses to serotonin in mice. This suggests allergic reactions may contribute to the development of pulmonary arterial hypertension.
Area of Science:
- Immunology
- Cardiovascular Physiology
- Respiratory Medicine
Background:
- Pulmonary arterial vasoconstriction is a key factor in pulmonary hypertension development.
- Inflammatory processes are crucial in the pathogenesis of pulmonary hypertension.
Purpose of the Study:
- To investigate the impact of acute allergic lung inflammation on pulmonary hemodynamics.
- To explore the role of serotonin signaling in allergic pulmonary hypertension.
Main Methods:
- BALB/c mice were sensitized to ovalbumin and challenged via inhalation.
- Ex vivo lung perfusion allowed continuous monitoring of pulmonary arterial pressure (Ppa).
- Pharmacological antagonists and specific inhibitors were used to probe signaling pathways.
Main Results:
- Allergen-sensitized and challenged mice exhibited a five-fold increase in Ppa response to serotonin.
- This enhanced response was blocked by a serotonin receptor-2A antagonist (ketanserin).
- Allergic lungs showed heightened Ppa increases to U46619, angiotensin II, and endothelin-1.
Conclusions:
- Acute allergic lung inflammation leads to significant pulmonary vascular hyperresponsiveness.
- Serotonin receptor-2A signaling plays a critical role in this hyperresponsiveness.
- Allergic inflammation may be a contributing factor in the development of pulmonary arterial hypertension.