title: Induction of cyclooxygenase-2 expression by manganese in cultured astrocytes.
abstract: Inflammatory and oxidative events are present in neurodegenerative disorders and appear to contribute to initiation and/or progression of the disease. Within the brain, redox-active metals, such as manganese, play an important role as components of proteins essential for neural function. However, increasing evidence implies its participation in neurodegenerative diseases involving immune modulation. Prostaglandins (PGs) are lipid mediators that participate in the regulation of physiological and pathophysiological processes, particularly during brain inflammation. In this study, we investigated whether the immune modulating action of manganese involved regulation of PGE2 production in cortical astrocytes. Within non-toxic concentrations, manganese caused an elevation in the expression of cyclooxygenase-2 (COX-2) mRNA and protein and increased PGE2 release. Manganese potentiated COX-2 expression and PGE2 generation by lipopolysaccharide/interferon-gamma-activated astrocytes. The inductive action of manganese was accompanied by generation of oxidative stress, activation of mitogen-activated protein kinases (MAPKs), AKT, and protein kinase C-alpha (PKC-alpha), and increased NF-kappaB and AP-1 DNA binding activities. The generation of reactive oxygen species (ROS) was critical to manganese-induced changes in astrocytes, including MAPKs, PKC-alpha, NF-kappaB, AP-1, and COX-2 expression but not AKT. Collectively, these data indicate that manganese might cause changes in neural activity through the modulation of oxidative and inflammatory events in astrocytes.
authors.affiliation: Department of Education and Research, Taichung Veterans General Hospital, Taichung, Taiwan.
authors.forename: Su-Lan
authors.initials: SL
authors.lastname: Liao
authors.forename: Yen-Chuan
authors.initials: YC
authors.lastname: Ou
authors.forename: Shih-Yun
authors.initials: SY
authors.lastname: Chen
authors.forename: An-Na
authors.initials: AN
authors.lastname: Chiang
authors.forename: Chun-Jung
authors.initials: CJ
authors.lastname: Chen
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001253:Astrocytes / Q000166:cytology / Q000187:drug effects / Q000201:enzymology*; D002462:Cell Membrane / Q000201:enzymology; D002470:Cell Survival; D002478:Cells, Cultured; D051546:Cyclooxygenase 2 / Q000235:genetics*; D004790:Enzyme Induction / Q000187:drug effects; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D008345:Manganese / Q000494:pharmacology*; D010084:Oxidation-Reduction; D011493:Protein Kinase C / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D017382:Reactive Oxygen Species; D008345:Manganese; D051546:Cyclooxygenase 2; D011493:Protein Kinase C