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B and Activator Protein-1 Transcription Blocks Allergic Airway Inflammation in a Mouse Asthma Model1
,
Departments of
* Medicine,
Pathology, and
Pathobiology, University Washington, Seattle, WA 98195; and
Pacific Northwest Research Institute, Seattle, WA 98122
An oxidant/antioxidant imbalance is seen in the lungs of patients
with asthma. This oxidative stress in asthmatic airways may lead to
activation of redox-sensitive transcription factors, NF-
B and AP-1.
We examined the effect of the small molecule inhibitor of
redox-regulated NF-B and AP-1 transcription, MOL 294 on airway
inflammation and airway hyperreactivity (AHR) in a mouse model of
asthma. MOL 294 is a potent nonpeptide inhibitor of NF-B and AP-1
based upon a 
-strand template that binds to and inhibits the
cellular redox protein thioredoxin. BALB/c mice after i.p. OVA
sensitization (day 0) were challenged with intranasal OVA on days 14,
25, 26, and 27. MOL 294, administered intranasal on days 25–27,
blocked the airway inflammatory response to OVA assessed 24 h
after the last OVA challenge on day 28. MOL 294 reduced eosinophil,
IL-13, and eotaxin levels in bronchoalveolar lavage fluid and airway
tissue eosinophilia and mucus hypersecretion. MOL 294 also decreased
AHR in vivo to methacholine. These results support redox-regulated
transcription as a therapeutic target in asthma and demonstrate that
selective inhibitors can reduce allergic airway inflammation and
AHR.
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