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- W2039198468 abstract "The lysophospholipid, sphingosine 1-phosphate (S1P), regulates a multitude of cellular functions by activating specific G protein-coupled receptors (GPCRs) (S1P(1-5), plus three newly identified S1P receptors). The G(i)-coupled S1P(1) receptor inhibits adenylyl cyclase, stimulates mitogen-activated protein kinases (MAP kinases) and cell migration, and is required for blood vessel maturation. Here, we report that S1P(1) inhibits Ca(2+) signalling in a number of cell types. In HEK-293 cells, which endogenously express S1P(1-3), overexpression of S1P(1) reduced intracellular free Ca(2+) concentration ([Ca(2+)](i)) increases induced by various receptor agonists as well as thapsigargin. The inhibitory Ca(2+) signalling of S1P(1) was blocked by pertussis toxin (PTX) and the protein kinase C (PKC) inhibitor, Gö6976, and imitated by phorbol ester and overexpression of classical PKC isoforms. Activation of S1P(1) stably expressed in RH7777 cells, which endogenously do not express S1P receptors, also inhibited Ca(2+) signalling, without mediating Ca(2+) mobilization on its own. It is concluded that the widely expressed S1P receptor S1P(1) inhibits Ca(2+) signalling, most likely via G(i) proteins and classical PKC isoforms. Co-expression of S1P(1) with S1P(3), but not S1P(2), reversed the inhibitory effect of S1P(1), furthermore suggesting a specific interplay of S1P receptor subtypes usually found within a single cell type." @default.
- W2039198468 created "2016-06-24" @default.
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- W2039198468 date "2003-07-01" @default.
- W2039198468 modified "2023-10-18" @default.
- W2039198468 title "Inhibition of Ca2+ signalling by the sphingosine 1-phosphate receptor S1P1" @default.
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- W2039198468 doi "https://doi.org/10.1016/s0898-6568(03)00011-1" @default.
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