Activation of sphingosine kinase by the bradykinin B2 receptor and its implication in regulation of the ERK/MAP kinase pathway.

Sphingosine kinase phosphorylates sphingosine to generate sphingosine 1-phosphate, a phospholipid that has been implicated in signaling by a number of transmembrane receptors and was recently shown to act as a ligand for a specific class of G protein-coupled receptors. Here we show that the G protein-coupled bradykinin B2 receptor activates ...
sphingosine kinase leading to a time- and dose-dependent elevation of cellular sphingosine 1-phosphate levels that was blocked by the sphingosine kinase inhibitor dihydrosphingosine. Furthermore, increasing doses of this inhibitor partially affected the bradykinin-mediated ERK/MAP kinase activation and fully blocked the protein kinase C-independent component of the signaling pathway from the B2 receptor to the ERK/MAP kinase cascade. Overexpression of sphingosine kinase did not additionally increase the bradykinin-induced ERK/MAP kinase activity, indicating a permissive rather than activating role of sphingosine 1-phosphate in B2 receptor-mediated mitogenic signaling.
Mesh Terms:
Enzyme Activation, Enzyme Inhibitors, Gene Expression Regulation, Enzymologic, Humans, Lysophospholipids, Mitogen-Activated Protein Kinases, Phosphotransferases (Alcohol Group Acceptor), Receptor, Bradykinin B2, Receptors, Bradykinin, Signal Transduction, Sphingosine
Biol. Chem.
Date: Jan. 01, 2001
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