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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-kappaB and AP-1. We examined the effect of the small molecule inhibitor of redox-regulated NF-kappaB 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-kappaB and AP-1 based upon a beta-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.

A Small Molecule Inhibitor of Redox-Regulated NF-κB and Activator Protein-1 Transcription Blocks Allergic Airway Inflammation in a Mouse Asthma Model