title: Activation of adenosine A3 receptors on macrophages inhibits tumor necrosis factor-alpha.
abstract: Murine macrophage-derived tumor necrosis factor alpha (TNF-alpha) gene expression has been shown to be dramatically induced by bacterial lipopolysaccharide, and to be dependent upon nuclear factor-kappa B (NF-kappa B) binding sites in its promoter for the lipopolysaccharide induction. Murine J774.1 macrophage cells were found to predominantly express the adenosine A3 receptor RNA relative to adenosine A1 receptor or adenosine A2 receptor RNA. Adenosine receptor agonists, in a dose-dependent manner characteristic of the adenosine A3 receptor, blocked the endotoxin induction of the TNF-alpha gene and TNF-alpha protein expression in the J774.1 macrophage cell line. The adenosine A3 receptor antagonist BW-1433 dose-dependently reversed this adenosine inhibitory effect on TNF-alpha gene expression. Thus, the binding of adenosine receptor agonists to the adenosine A3 receptor interrupts the endotoxin CD14 receptor signal transduction pathway and blocks induction of cytokine TNF-alpha, revealing a novel cross-talk between the murine adenosine A3 receptor and the endotoxin CD14 receptor in J774.1 macrophages.
authors.affiliation: Department of Immunology, Marion Merrell Dow Research Institute, Marion Merrell Dow Pharmaceuticals, Inc., Cincinnati, OH 45215-6300, USA.
authors.forename: C D
authors.initials: CD
authors.lastname: McWhinney
authors.forename: M W
authors.initials: MW
authors.lastname: Dudley
authors.forename: T L
authors.initials: TL
authors.lastname: Bowlin
authors.forename: N P
authors.initials: NP
authors.lastname: Peet
authors.forename: L
authors.initials: L
authors.lastname: Schook
authors.forename: M
authors.initials: M
authors.lastname: Bradshaw
authors.forename: M
authors.initials: M
authors.lastname: De
authors.forename: D R
authors.initials: DR
authors.lastname: Borcherding
authors.forename: C K
authors.initials: CK
authors.lastname: Edwards
mesh_terms: D000818:Animals; D002460:Cell Line; D005786:Gene Expression Regulation / Q000187:drug effects; D008156:Luciferases / Q000235:genetics; D008264:Macrophages / Q000378:metabolism*; D051379:Mice; D058906:Purinergic P1 Receptor Agonists; D018047:Receptors, Purinergic P1 / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors* / Q000235:genetics
chemical_list: D058906:Purinergic P1 Receptor Agonists; D018047:Receptors, Purinergic P1; D011993:Recombinant Fusion Proteins; D014409:Tumor Necrosis Factor-alpha; D008156:Luciferases