title: p53 Attenuates lipopolysaccharide-induced NF-kappaB activation and acute lung injury.
abstract: The transcriptional factor p53 has primarily been characterized for its central role in the regulation of oncogenesis. A reciprocal relationship between the activities of p53 and NF-kappaB has been demonstrated in cancer cells, but there is little information concerning interactions between p53 and NF-kappaB in inflammatory processes. In this study, we found that neutrophils and macrophages lacking p53, i.e., p53(-/-), have elevated responses to LPS stimulation compared with p53(+/+) cells, producing greater amounts of proinflammatory cytokines, including TNF-alpha, IL-6, and MIP-2, and demonstrating enhanced NF-kappaB DNA-binding activity. p53(-/-) mice are more susceptible than are p53(+/+) mice to LPS-induced acute lung injury (ALI). The enhanced response of p53(-/-) cells to LPS does not involve alterations in intracellular signaling events associated with TLR4 engagement, such as activation of MAPKs, phosphorylation of IkappaB-alpha or the p65 subunit of NF-kappaB, or IkappaB-alpha degradation. Culture of LPS-stimulated neutrophils and macrophages with nutlin-3a, a specific inducer of p53 stabilization, attenuated NF-kappaB DNA-binding activity and production of proinflammatory cytokines. Treatment of mice with nutlin-3a reduced the severity of LPS-induced ALI. These data demonstrate that p53 regulates NF-kappaB activity in inflammatory cells and suggest that modulation of p53 may have potential therapeutic benefits in acute inflammatory conditions, such as ALI.
authors.affiliation: Department of Medicine, University of Alabama at Birmingham, AL 35294, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Park
authors.forename: Yuko
authors.initials: Y
authors.lastname: Tsuruta
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Lorne
authors.forename: Edward
authors.initials: E
authors.lastname: Abraham