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• W2007697747 abstract "The primordial intercellular signaling molecule ATP acts through two families of cell-surface P2 receptors – the P2Y family of G protein-coupled receptors and the P2X family of ligand-gated cation channels. Multiple P2 receptors are expressed in a variety of cell types. However, the significance of these networks of receptors in any biological system remains unknown. Using osteoblasts as a model system, we found that a low concentration of ATP (10 µM, ATPlow) induced transient elevation of cytosolic Ca2+; whereas, a high concentration of ATP (1 mM, ATPhigh) elicited more sustained elevation. Moreover, graded increases in the Ca2+ signal were achieved over a remarkable million-fold range of ATP concentrations (1 nM to 1 mM). Next, we demonstrated that ATPlow caused transient nuclear localization of NFATc1; whereas, ATPhigh elicited more sustained localization. When stimulated with ATPhigh, osteoblasts from P2X7 loss-of-function mice showed only transient Ca2+-NFATc1 signaling; in contrast, sustained signaling was observed in wild-type cells. Additional experiments revealed a role for P2Y receptors in mediating transient signaling induced by low ATP concentrations. Thus, distinct P2 receptors with varying affinities for ATP account for this wide range of sensitivity to extracellular nucleotides. Finally, ATPhigh, but not ATPlow, was shown to elicit robust expression of the NFAT target gene Ptgs2 (encoding COX-2), consistent with a critical role for duration of Ca2+-NFAT signaling in regulating target gene expression. Taken together, ensembles of P2 receptors provide a mechanism by which cells sense ATP over a wide concentration range, and transduce this input into distinct cellular signals." @default.
• W2007697747 created "2016-06-24" @default.
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• W2007697747 date "2013-01-01" @default.
• W2007697747 modified "2023-09-27" @default.
• W2007697747 title "P2 receptor networks regulate signaling duration over a wide dynamic range of ATP concentrations" @default.
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• W2007697747 doi "https://doi.org/10.1242/jcs.122705" @default.
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