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Nuclear factor (NF)-κB is central to the pathogenesis of inflammation in acute lung injury, but also to inflammation resolution and repair. We wished to determine whether overexpression of the NF-κB inhibitor IκBα could modulate the severity of acute and prolonged pneumonia-induced lung injury in a series of prospective randomized animal studies.    Methods  Adult male Sprague-Dawley rats were randomized to undergo intratracheal instillation of (a) 5 × 10 9  adenoassociated virus (AAV) vectors encoding the IκBα transgene (5 × 10 9  AAV-IκBα); (b) 1 × 10 10  AAV-IκBα; (c) 5 × 10 10  AAV-IκBα; or (d) vehicle alone. After intratracheal inoculation with  Escherichia coli , the severity of the lung injury was measured in one series over a 4-hour period (acute pneumonia), and in a second series after 72 hours (prolonged pneumonia). Additional experiments examined the effects of IκBα and null-gene overexpression on  E. coli -induced and sham pneumonia.    Results  In acute pneumonia, IκBα dose-dependently decreased lung injury, improving arterial oxygenation and lung static compliance, reducing alveolar protein leak and histologic injury, and decreasing alveolar IL-1β concentrations. Benefit was maximal at the intermediate (1 × 10 10 ) IκBα vector dose; however, efficacy was diminished at the higher (5 × 10 10 ) IκBα vector dose. In contrast, IκBα worsened prolonged pneumonia-induced lung injury, increased lung bacterial load, decreased lung compliance, and delayed resolution of the acute inflammatory response.    Conclusions  Inhibition of pulmonary NF-κB activity reduces early pneumonia-induced injury, but worsens injury and bacterial load during prolonged pneumonia.

Inhibition of pulmonary nuclear factor kappa-B decreases the severity of acute Escherichia coli pneumonia but worsens prolonged pneumonia