title: Effects of Ni2+ ions on cell viability and NO production of murine peritoneal exudate cells (macrophages) with and without lipopolysaccharide stimulation.
abstract: The purpose of this study was to clarify the cytotoxicity of Ni2+ ions against murine peritoneal exudate cells (PEC) (macrophages). First, we examined the cell viability of PEC with and without lipopolysaccharide (LPS) stimulation in culture media containing Ni2+ ions up to 1000 micromol/L. Results showed that the cytotoxicity of Ni2+ ions against PEC was dose-dependent and accelerated by LPS stimulation, especially in media with Ni2+ ions exceeding 100 micromol/L. Second, we measured the production of nitric oxide (NO) from PEC and found that LPS caused the PEC to produce abundant NO. However, high dose of Ni2+ ions at concentration more than 200 micromol/L hindered and inhibited NO production. These results pointed out that the cytotoxicity of Ni2+ ions against macrophages depended on both the Ni2+ ion concentration and the presence of bacteria with LPS. Further, NO--a killer of bacteria--was lost when LPS-stimulated macrophages were exposed to high dose of Ni2+ ions.
authors.affiliation: Department of Dental Materials Science and Technology, School of Dentistry, Iwate Medical University, 1-3-27 Chuo-dori, Morioka 020-8505, Japan. mtaira@iwate-med.ac.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Taira
authors.forename: Minoru
authors.initials: M
authors.lastname: Sasaki
authors.forename: Chiharu
authors.initials: C
authors.lastname: Yamaura-Tanaka
authors.forename: Setsuo
authors.initials: S
authors.lastname: Saitoh
authors.forename: Shigenobu
authors.initials: S
authors.lastname: Kimura
authors.forename: Yoshima
authors.initials: Y
authors.lastname: Araki
mesh_terms: D000199:Actins / Q000032:analysis; D000818:Animals; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D016166:Free Radical Scavengers / Q000378:metabolism*; D007375:Interleukin-1 / Q000032:analysis; D015850:Interleukin-6 / Q000032:analysis; D008070:Lipopolysaccharides / Q000008:administration & dosage / Q000633:toxicity*; D017737:Macrophages, Peritoneal / Q000187:drug effects*; D051379:Mice; D009532:Nickel / Q000008:administration & dosage / Q000633:toxicity*; D009569:Nitric Oxide / Q000032:analysis / Q000096:biosynthesis*; D019001:Nitric Oxide Synthase / Q000032:analysis / Q000187:drug effects; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis / Q000187:drug effects
chemical_list: D000199:Actins; D016166:Free Radical Scavengers; D007375:Interleukin-1; D015850:Interleukin-6; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D009569:Nitric Oxide; D009532:Nickel; D019001:Nitric Oxide Synthase