title: The uncoupling protein 2 modulates the cytokine balance in innate immunity.
abstract: The uncoupling protein 2 (UCP2) is located in the inner mitochondrial membrane and downregulates the production of reactive oxygen species (ROS). Recent data suggested a role for UCP2 in the immune response. We analyzed further this hypothesis during acute Listeria monocytogenes infection in mice. Death of infected Ucp2(-/-) mice was delayed in comparison with Ucp2(+/+), suggesting a role of UCP2 in the early step of the immune response. In vitro, the higher resistance of Ucp2(-/-) mice was not associated with a better control of bacterial growth by macrophages. In vivo, a significant increase of recruited phagocytes was observed in the spleen of Ucp2(-/-) mice. This was associated with a higher level of ROS in the spleen. Upregulation of pro-inflammatory cytokines IFNgamma, IL6, and IL1beta and of the chemokine MCP1 was observed in Ucp2(-/-) mice 4 days after infection, preceded by a decrease of the anti-inflammatory cytokine IL10 production. Present data highlight that, in an acute model of infection, UCP2 modulates innate immunity, via the modulation of ROS production, cytokine and chemokine production and consequently phagocyte recruitment.
authors.affiliation: CNRS-UPR 9078, Faculté de Médecine Necker-Enfants malades, 156 rue de Vaugirard, 75730 Paris Cedex 15, France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Rousset
authors.forename: Yalin
authors.initials: Y
authors.lastname: Emre
authors.forename: Olivier
authors.initials: O
authors.lastname: Join-Lambert
authors.forename: Corinne
authors.initials: C
authors.lastname: Hurtaud
authors.forename: Daniel
authors.initials: D
authors.lastname: Ricquier
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Cassard-Doulcier
mesh_terms: D000818:Animals; D016207:Cytokines / Q000097:blood / Q000378:metabolism*; D007113:Immunity, Innate; D066298:In Vitro Techniques; D007473:Ion Channels / Q000172:deficiency / Q000235:genetics / Q000276:immunology*; D008089:Listeria monocytogenes / Q000276:immunology / Q000472:pathogenicity; D008264:Macrophages / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D024101:Mitochondrial Proteins / Q000172:deficiency / Q000235:genetics / Q000276:immunology*; D010586:Phagocytes / Q000276:immunology / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013154:Spleen / Q000276:immunology / Q000378:metabolism; D000071246:Uncoupling Protein 2
chemical_list: D016207:Cytokines; D007473:Ion Channels; D024101:Mitochondrial Proteins; D017382:Reactive Oxygen Species; C000604390:Ucp2 protein, mouse; D000071246:Uncoupling Protein 2