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Endothelin-1 potentiates smoke-induced acute lung inflammation
Tapan M Bhavsar1, Xingjian Liu, Joseph M Cerreta
1School of Pharmacy and Allied Health Sciences, St John's University, New York, New York, USA.
Experimental Lung Research
|December 17, 2008
Summary
Endothelin-1 (ET-1) worsens acute lung inflammation from cigarette smoke. A novel antagonist blocked these effects, suggesting ET-1 acts as an inflammatory cell gatekeeper.
Area of Science:
- Pulmonary Medicine
- Toxicology
- Inflammation Research
Background:
- Cigarette smoke exposure causes acute lung inflammation.
- Endothelin-1 (ET-1) is implicated in inflammatory processes.
Purpose of the Study:
- To investigate the role of ET-1 in cigarette smoke-induced acute lung inflammation.
- To evaluate the efficacy of an endothelin receptor A antagonist in mitigating these inflammatory responses.
Main Methods:
- Hamsters were administered ET-1 and exposed to cigarette smoke for 3 days.
- Evaluated lung histopathology, bronchoalveolar lavage fluid (BALF) neutrophils, TNFR1-labeled BALF macrophages, and alveolar cell apoptosis.
- Assessed the impact of HJP272, an endothelin receptor A antagonist, on these markers.
Main Results:
- ET-1 significantly amplified smoke-induced lung inflammation markers.
- Exogenous ET-1 increased BALF neutrophils, indicating a gatekeeper role.
- HJP272 pretreatment effectively blocked the inflammatory effects of ET-1 and smoke.
Conclusions:
- ET-1 plays a crucial role in mediating acute lung inflammation from cigarette smoke exposure.
- Targeting endothelin receptors with antagonists like HJP272 may offer a therapeutic strategy for smoke-induced lung injury.
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