title: Identification of chemerin receptor (ChemR23) in human endothelial cells: chemerin-induced endothelial angiogenesis.
abstract: Chemerin acting via its distinct G protein-coupled receptor CMKLR1 (ChemR23), is a novel adipokine, circulating levels of which are raised in inflammatory states. Chemerin shows strong correlation with various facets of the metabolic syndrome; these states are associated with an increased incidence of cardiovascular disease (CVD) and dysregulated angiogenesis. We therefore, investigated the regulation of ChemR23 by pro-inflammatory cytokines and assessed the angiogenic potential of chemerin in human endothelial cells (EC). We have demonstrated the novel presence of ChemR23 in human ECs and its significant up-regulation (P<0.001) by pro-inflammatory cytokines, TNF-alpha, IL-1beta and IL-6. More importantly, chemerin was potently angiogenic, as assessed by conducting functional in-vitro angiogenic assays; chemerin also dose-dependently induced gelatinolytic (MMP-2 & MMP-9) activity of ECs (P<0.001). Furthermore, chemerin dose-dependently activated PI3K/Akt and MAPKs pathways (P<0.01), key angiogenic and cell survival cascades. Our data provide the first evidence of chemerin-induced endothelial angiogenesis and MMP production and activity.
authors.affiliation: Endocrinology and Metabolism Research Group, University of Warwick Medical School, Gibbet Hill Road, Coventry CV4 7AL, UK.
authors.forename: Jaspreet
authors.initials: J
authors.lastname: Kaur
authors.forename: Raghu
authors.initials: R
authors.lastname: Adya
authors.forename: Bee K
authors.initials: BK
authors.lastname: Tan
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Harpal S
authors.initials: HS
authors.lastname: Randeva
mesh_terms: D002196:Capillaries / Q000254:growth & development; D049109:Cell Proliferation; D018925:Chemokines / Q000378:metabolism / Q000494:pharmacology; D016207:Cytokines / Q000378:metabolism; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D018919:Neovascularization, Physiologic; D019707:Receptors, Chemokine / Q000235:genetics / Q000378:metabolism*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: C102741:CMKLR1 protein, human; D018925:Chemokines; D016207:Cytokines; D036341:Intercellular Signaling Peptides and Proteins; C478630:RARRES2 protein, human; D019707:Receptors, Chemokine; C535150:MAPK1 protein, human; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048051:p38 Mitogen-Activated Protein Kinases; D020929:Mitogen-Activated Protein Kinase Kinases; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9