2,3,7,8-Tetrachlorodibenzo-p-dioxin Increases mRNA Levels for Interleukin-1β, Urokinase Plasminogen Activator, and Tumor Necrosis Factor-α in Human Uterine Endometrial Adenocarcinoma RL95-2 Cells

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Kathleen T. Shiverick
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Sanaa Hawai ◽  
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Ashley Bill ◽  
Ola Ghoneim ◽  
...  

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1989 ◽  
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2001 ◽  
Vol 280 (4) ◽  
pp. L659-L665 ◽  
Author(s):  
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Torstein Lyberg ◽  
Geir Christensen ◽  
Ole H. Skjønsberg

Endothelin (ET)-1 has been launched as an important mediator in bronchial asthma, which is an eosinophilic airway inflammation. However, the interplay between ET-1 and other proinflammatory mediators during the development of airway inflammation has not been elucidated. We wanted to study 1) whether the production of ET-1 precedes the production of other proinflammatory mediators and 2) whether ET-1 stimulates the production of these mediators within the airways. These hypotheses were studied during the development of an eosinophilic airway inflammation in rats. The increase in ET-1 mRNA level in lung tissue preceded the increase in mRNA levels of tumor necrosis factor-α, interleukin (IL)-1β, and IL-8. Treatment of the animals with the ET receptor antagonist bosentan resulted in a substantial decrease in the concentrations of tumor necrosis factor-α, IL-4, IL-1β, interferon-γ, and ET-1 in bronchoalveolar lavage fluid. In conclusion, the synthesis of ET-1 as measured by increased mRNA level precedes the synthesis of other proinflammatory cytokines of importance for the development of an eosinophilic airway inflammation, and ET antagonism inhibits the production of these mediators within the airways. Whether treatment with ET antagonists will prove beneficial for patients with eosinophilic airway inflammations like bronchial asthma is not yet known.


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