PMID: 15356157Sep 10, 2004Paper

STAT4 is a critical mediator of early innate immune responses against pulmonary Klebsiella infection

The Journal of Immunology : Official Journal of the American Association of Immunologists
Jane C DengT J Standiford

Abstract

Bacterial pneumonia is a leading cause of morbidity and mortality in the U.S. An effective innate immune response is critical for the clearance of bacteria from the lungs. IL-12, a key T1 cytokine in innate immunity, signals through STAT4. Thus, understanding how STAT4 mediates pulmonary immune responses against bacterial pathogens will have important implications for the development of rational immunotherapy targeted at augmenting innate immunity. We intratracheally administered Klebsiella pneumoniae to wild-type BALB/c and STAT4 knockout (STAT4-/-) mice. Compared with wild-type controls, STAT4-/- mice had decreased survival following intratracheal Klebsiella administration, which was associated with a higher lung and blood bacterial burden. STAT4-/- animals also displayed impaired pulmonary IFN-gamma production and decreased levels of proinflammatory cytokines, including the ELR- CXC chemokines IFN-gamma-inducible protein-10 and monokine induced by IFN-gamma. Although total lung leukocyte populations were similar between STAT4-/- and wild-type animals following infection, alveolar macrophages isolated from infected STAT4-/- mice had decreased production of proinflammatory cytokines, including IFN-gamma, compared with infected...Continue Reading

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