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Our laboratory integrates molecular genetics with immunology, biochemistry, and cell biology to study bacterial pathogenesis, focusing on innate immunity and macrophage-Salmonella interactions. The production of reactive oxygen species (ROS) such as superoxide and hydrogen peroxide by phagocytic cells has long been recognized to be an important component of host defense. Reactive nitrogen species (RNS) such as nitric oxide and S-nitrosothiols have more recently been demonstrated to be important phagocyte-derived molecules that also possess broad-spectrum antimicrobial activity. We are attempting to determine the molecular mechanisms of ROS/RNS-related cytotoxicity and relevant cytoprotective mechanisms. In vitro observations are correlated with studies of bacterial virulence in macrophages and normal or immunodeficient mice to establish their relevance to the pathogenesis of infection. Specific projects examine the interrelationship between nitric oxide and iron metabolism, the role of alternative sigma factors in controlling antioxidant stress responses, the regulation of host responses to infection, and the mechanisms by which reactive nitrogen and oxygen species impair microbial DNA replication. PUBLICATIONS Schapiro JM, Libby SJ, Fang FC. Inhibition of bacterial DNA replication by zinc mobilization during nitrosative stress. Proc Natl Acad Sci USA 100:8496-501, 2003. |
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