Cytoprotection against oxidative stress-induced damage of astrocytes by extracellular ATP via P2Y1 receptors

Youichi Shevozaki, Schuichi Koizumi, Seiichi Ishida, Jun Ichi Sawada, Yasuo Ohno, Kazuhide Inoue

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Oxidative stress is the main cause of neuronal damage in traumatic brain injury, hypoxia/reperfusion injury, and neurodegenerative disorders. Although extracellular nucleosides, especially adenosine, are well known to protect against neuronal damage in such pathological conditions, the effects of these nucleosides or nucleotides on glial cell damage remain largely unknown. We report that ATP but not adenosine protects against the cell death of cultured astrocytes induced by hydrogen peroxide (H2O2). ATP ameliorated the H2O2-induced decrease in cell viability of astrocytes in an incubation time- and concentration-dependent fashion. Protection by ATP was inhibited by P2 receptor antagonists and was mimicked by P2Y1 receptor agonists but not by adenosine. The expressions of P2Y1 mRNAs and functional P2Y1 receptors in astrocytes were confirmed. Thus, ATP, acting on P2Y1 receptors in astrocytes, showed a protective action against H2O2. The astrocytic protection by the P2Y1 receptor agonist 2-methylthio-ADP was inhibited by an intracellular Ca2+ chelator and a blocker of phospholipase C, indicating the involvement of intracellular signals mediated by Gq/11-coupled P2Y1 receptors. The ATP-induced protection was inhibited by cycloheximide, a protein synthesis inhibitor, and it took more than 12 h for the onset of the protective action. In the DNA microarray analysis, ATP induced a dramatic upregulation of various oxidoreductase genes. Taken together, ATP acts on P2Y1 receptors coupled to Gq/11, resulting in the upregulation of oxidoreductase genes, leading to the protection of astrocytes against H2O2.

Original languageEnglish
Pages (from-to)288-300
Number of pages13
JournalGLIA
Volume49
Issue number2
DOIs
Publication statusPublished - Jan 15 2005

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Purinergic P2Y1 Receptors
Cytoprotection
Astrocytes
Oxidative Stress
Adenosine Triphosphate
Adenosine
Nucleosides
Oxidoreductases
Up-Regulation
Brain Hypoxia
Protein Synthesis Inhibitors
Type C Phospholipases
Cycloheximide
Microarray Analysis
Chelating Agents
Oligonucleotide Array Sequence Analysis
Reperfusion Injury
Neuroglia
Neurodegenerative Diseases
Hydrogen Peroxide

All Science Journal Classification (ASJC) codes

  • Neurology
  • Cellular and Molecular Neuroscience

Cite this

Cytoprotection against oxidative stress-induced damage of astrocytes by extracellular ATP via P2Y1 receptors. / Shevozaki, Youichi; Koizumi, Schuichi; Ishida, Seiichi; Sawada, Jun Ichi; Ohno, Yasuo; Inoue, Kazuhide.

In: GLIA, Vol. 49, No. 2, 15.01.2005, p. 288-300.

Research output: Contribution to journalArticle

Shevozaki, Youichi ; Koizumi, Schuichi ; Ishida, Seiichi ; Sawada, Jun Ichi ; Ohno, Yasuo ; Inoue, Kazuhide. / Cytoprotection against oxidative stress-induced damage of astrocytes by extracellular ATP via P2Y1 receptors. In: GLIA. 2005 ; Vol. 49, No. 2. pp. 288-300.
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