title: Transcriptional profiling of human monocytes reveals complex changes in the expression pattern of inflammation-related genes in response to the annexin A1-derived peptide Ac1-25.
abstract: Annexin A1 is a glucocorticoid-regulated, anti-inflammatory protein, which plays an important role as an endogenous regulator of the inflammatory response. Many of these anti-inflammatory properties are retained in the N-terminal annexin A1 peptide Ac1-25, which is released from the full-length protein by a neutrophil elastase. To elucidate whether the anti-inflammatory activity of the bioactive peptide is solely a result of immediate post-translational effects, which include the shedding of L-selectin or also involve transcriptional changes affecting leukocyte function, we recorded global gene expression changes in human monocytes stimulated with exogenously applied Ac1-25. Applying stringent selection criteria, we show that approximately 100 genes are up-regulated, and approximately 230 are down-regulated by a factor of at least two in the Ac1-25-treated monocytes. It is important that the profiling reveals that Ac1-25 induces an anti-inflammatory phenotype by down-regulating proinflammatory and up-regulating anti-inflammatory mediators. These effects, elicited by exogenously applied Ac1-25, depend, to different extents, on ERK1/2 and p38 signaling pathways. This identifies the annexin A1 N-terminal peptide as a stimulus, eliciting not only short-term, post-translational effects in human monocytes but also transcriptional changes, defining a more anti-inflammatory profile.
authors.affiliation: Institute of Medical Biochemistry, Centre for Molecular Biology of Inflammation, and Interdisciplinary Clinical Research Centre, University of Muenster, Muenster, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Lange
authors.forename: Diane J
authors.initials: DJ
authors.lastname: Starrett
authors.forename: Julia
authors.initials: J
authors.lastname: Goetsch
authors.forename: Volker
authors.initials: V
authors.lastname: Gerke
authors.forename: Ursula
authors.initials: U
authors.lastname: Rescher
mesh_terms: D017305:Annexin A1 / Q000494:pharmacology*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D007249:Inflammation / Q000201:enzymology / Q000235:genetics*; D053590:Interleukin 1 Receptor Antagonist Protein / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000187:drug effects; D009000:Monocytes / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism*; D010455:Peptides / Q000494:pharmacology; D054390:Receptors, CCR2 / Q000378:metabolism; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D017305:Annexin A1; D053590:Interleukin 1 Receptor Antagonist Protein; D010455:Peptides; D054390:Receptors, CCR2; D048049:Extracellular Signal-Regulated MAP Kinases; D048051:p38 Mitogen-Activated Protein Kinases