title: MicroRNA-155 modulates the interleukin-1 signaling pathway in activated human monocyte-derived dendritic cells.
abstract: In response to inflammatory stimulation, dendritic cells (DCs) have a remarkable pattern of differentiation (maturation) that exhibits specific mechanisms to control immunity. Here, we show that in response to Lipopolysaccharides (LPS), several microRNAs (miRNAs) are regulated in human monocyte-derived dendritic cells. Among these miRNAs, miR-155 is highly up-regulated during maturation. Using LNA silencing combined to microarray technology, we have identified the Toll-like receptor/interleukin-1 (TLR/IL-1) inflammatory pathway as a general target of miR-155. We further demonstrate that miR-155 directly controls the level of TAB2, an important signal transduction molecule. Our observations suggest, therefore, that in mature human DCs, miR-155 is part of a negative feedback loop, which down-modulates inflammatory cytokine production in response to microbial stimuli.
authors.affiliation: Centre d'Immunologie de Marseille-Luminy, Université de la Méditerranée, Case 906, 13288 Marseille cedex 9, France.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Ceppi
authors.forename: Patricia M
authors.initials: PM
authors.lastname: Pereira
authors.forename: Isabelle
authors.initials: I
authors.lastname: Dunand-Sauthier
authors.forename: Emmanuèle
authors.initials: E
authors.lastname: Barras
authors.forename: Walter
authors.initials: W
authors.lastname: Reith
authors.forename: Manuel A
authors.initials: MA
authors.lastname: Santos
authors.forename: Philippe
authors.initials: P
authors.lastname: Pierre
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D002478:Cells, Cultured; D017931:DNA Primers; D003713:Dendritic Cells / Q000378:metabolism*; D006801:Humans; D007375:Interleukin-1 / Q000378:metabolism*; D008213:Lymphocyte Activation; D035683:MicroRNAs / Q000502:physiology*; D009000:Monocytes / Q000378:metabolism*; D012323:RNA Processing, Post-Transcriptional; D015398:Signal Transduction / Q000502:physiology*; D051193:Toll-Like Receptors / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D017931:DNA Primers; D007375:Interleukin-1; D035683:MicroRNAs; C410585:TAB2 protein, human; D051193:Toll-Like Receptors