Linked Life Data

12529254

Source:http://linkedlifedata.com/resource/pubmed/id/12529254

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pubmed-article:12529254pubmed:abstractTextAstrocytes are involved in normal and pathological brain functions, where they become activated and undergo reactive gliosis. Astrocytes have been shown to respond to extracellular nucleotides via the activation of P2 receptors, either G protein-coupled P2Y receptors or P2X receptors that are ligand-gated ion channels. In this study, we have examined the manner in which activation of the P2X(7) nucleotide receptor, an extracellular ATP-gated ion channel expressed in astrocytes, can lead to the phosphorylation of ERK1/2. Results showed that the P2X(7) receptor agonist 2',3'-O-(4-benzoyl)benzoyl-ATP induced ERK1/2 phosphorylation in human astrocytoma cells overexpressing the recombinant rat P2X(7) receptor (rP2X(7)-R), a response that was inhibited by the P2X(7) receptor antagonist, oxidized ATP. Other results suggest that rP2X(7)-R-mediated ERK1/2 phosphorylation was linked to the phosphorylation of the proline-rich/Ca(2+)-activated tyrosine kinase Pyk2, c-Src, phosphatidylinositol 3'-kinase, and protein kinase Cdelta activities and was dependent on the presence of extracellular Ca(2+). These results support the hypothesis that the P2X(7) receptor and its signaling pathways play a role in astrocyte-mediated inflammation and neurodegenerative disease.lld:pubmed
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pubmed-article:12529254pubmed:articleTitleMechanisms of P2X7 receptor-mediated ERK1/2 phosphorylation in human astrocytoma cells.lld:pubmed
pubmed-article:12529254pubmed:affiliationDepartment of Biochemistry, University of Missouri-Columbia, Columbia, Missouri 65212, USA. fpgendron@hotmail.comlld:pubmed
pubmed-article:12529254pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12529254pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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