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- W2418147382 abstract "Abstract Exposure of human neutrophils to micromolar concentrations of both hydrolyzable and nonhydrolyzable purine nucleotides caused the generation of transient rises in intracellular calcium (Ca2+), Ca2+ fluxes across the membrane, and primed the cells for enhanced production of superoxide (O2-) when subsequently exposed to agonists such as FMLP and arachidonic acid. The neutrophils were most sensitive to adenosine triphosphate (ATP) and ATP-gamma-S, which produced Ca2+ transients and enhanced O2- production at concentrations as low as 1 to 5 mumol/L, with a doubling of O2- generation at 25 to 50 mumol/L. Adenosine diphosphate (ADP), guanosine triphosphate (GTP), and 5′- adenylylimidodiphosphate (AMP-PNP) required approximately 10-fold higher concentrations to cause similar effects. Adenosine did not cause Ca2+ fluxes or a Ca2+ transient and was inhibitory of O2- production. There was a strong correlation between a nucleotide's ability to generate a Ca2+ response and its ability to enhance O2- generation. Nitrogen cavitation and subcellular fractionation of the neutrophils after a brief exposure to ATP, ATP-gamma-S, and AMP-PNP revealed that the enhanced O2- generating capacity was stable and detectable in a cell-free assay system. By combining variously treated cytosolic and membrane fractions, it was found that the enhanced O2- production was attributable to a modification of a component(s) of the cytosol." @default.
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- W2418147382 date "1990-03-15" @default.
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- W2418147382 title "Exposure of human neutrophils to exogenous nucleotides causes elevation in intracellular calcium, transmembrane calcium fluxes, and an alteration of a cytosolic factor resulting in enhanced superoxide production in response to FMLP and arachidonic acid" @default.
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- W2418147382 doi "https://doi.org/10.1182/blood.v75.6.1324.1324" @default.
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