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pubmed-article:9053458pubmed:abstractTextMicroglial cells express a peculiar plasma membrane receptor for extracellular ATP, named P2Z/P2X7 purinergic receptor, that triggers massive transmembrane ion fluxes and a reversible permeabilization of the plasma membrane to hydrophylic molecules of up to 900 dalton molecule weight and eventual cell death (Di Virgilio, F. 1995. Immunol. Today, 16:524-528). The physiological role of this newly cloned (Surprenant, A., F. Rassendren, E. Kawashima, R. A. North and G. Buell, 1996. Science (Wash. DC). 272:735-737) cytolytic receptor is unknown. In vitro and in vivo activation of the macrophage and microglial cell P2Z/P2X7 receptor by exogenous ATP causes a large and rapid release of mature IL-1 beta. In the present report we investigated the role of microglial P2Z/P2X7 receptor in IL-1 beta release triggered by LPS. Our data suggest that LPS-dependent IL-1 beta release involves activation of this purinergic receptor as it is inhibited by the selective P2Z/P2X7 blocker oxidized ATP and modulated by ATP-hydrolyzing enzymes such as apyrase or hexokinase. Furthermore, microglial cells release ATP when stimulated with LPS. LPS-dependent release of ATP is also observed in monocyte-derived human macrophages. It is suggested that bacterial endotoxin activates an autocrine/paracrine loop that drives ATP-dependent IL-1 beta secretion.lld:pubmed
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pubmed-article:9053458pubmed:articleTitlePurinergic modulation of interleukin-1 beta release from microglial cells stimulated with bacterial endotoxin.lld:pubmed
pubmed-article:9053458pubmed:affiliationInstitute of General Pathology, University of Ferrara, Italy.lld:pubmed
pubmed-article:9053458pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9053458pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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