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- W2023681539 abstract "Adenine and uridine nucleotides evoke Ca(2+) signals via four subtypes of P2Y receptor in cultured aortic smooth muscle cells, but the mechanisms underlying the different patterns of these Ca(2+) signals are unresolved. Cytosolic Ca(2+) signals were recorded from single cells and populations of cultured rat aortic smooth muscle cells, loaded with a fluorescent Ca(2+) indicator and stimulated with agonists that allow subtype-selective activation of P2Y1, P2Y2, P2Y4, or P2Y6 receptors. Activation of P2Y1, P2Y2, and P2Y6 receptors caused homologous desensitisation, while activation of P2Y2 receptors also caused heterologous desensitisation of the other subtypes. The Ca(2+) signals evoked by each P2Y receptor subtype required activation of phospholipase C and release of Ca(2+) from intracellular stores via inositol 1,4,5-trisphosphate (IP(3)) receptors, but they were unaffected by inhibition of ryanodine or nicotinic acid adenine dinucleotide phosphate (NAADP) receptors. Sustained Ca(2+) signals were independent of the Na(+)/Ca(2+) exchanger and were probably mediated by store-operated Ca(2+) entry. Analyses of single cells established that most cells express P2Y2 receptors and at least two other P2Y receptor subtypes. We conclude that four P2Y receptor subtypes evoke Ca(2+) signals in cultured aortic smooth muscle cells using the same intracellular (IP(3) receptors) and Ca(2+) entry pathways (store-operated Ca(2+) entry). Different rates of homologous desensitisation and different levels of receptor expression account for the different patterns of Ca(2+) signal evoked by each P2Y receptor subtype." @default.
- W2023681539 created "2016-06-24" @default.
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- W2023681539 date "2012-07-06" @default.
- W2023681539 modified "2023-10-07" @default.
- W2023681539 title "P2Y receptor subtypes evoke different Ca2+ signals in cultured aortic smooth muscle cells" @default.
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- W2023681539 doi "https://doi.org/10.1007/s11302-012-9323-6" @default.
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