Sphingosine kinase-mediated Ca2+ signalling by G-protein-coupled receptors - PubMed (original) (raw)

Sphingosine kinase-mediated Ca2+ signalling by G-protein-coupled receptors

D Meyer zu Heringdorf et al. EMBO J. 1998.

Abstract

Formation of inositol 1,4,5-trisphosphate (IP3) by phospholipase C (PLC) with subsequent release of Ca2+ from intracellular stores, is one of the major Ca2+ signalling pathways triggered by G-protein-coupled receptors (GPCRs). However, in a large number of cellular systems, Ca2+ mobilization by GPCRs apparently occurs independently of the PLC-IP3 pathway, mediated by an as yet unknown mechanism. The present study investigated whether sphingosine kinase activation, leading to production of sphingosine-1-phosphate (SPP), is involved in GPCR-mediated Ca2+ signalling as proposed for platelet-derived growth factor and FcepsilonRI antigen receptors. Inhibition of sphingosine kinase by DL-threo-dihydrosphingosine and N,N-dimethylsphingosine markedly inhibited [Ca2+]i increases elicited by m2 and m3 muscarinic acetylcholine receptors (mAChRs) expressed in HEK-293 cells without affecting mAChR-induced PLC stimulation. Activation of mAChRs rapidly and transiently stimulated production of SPP in HEK-293 cells. Finally, intracellular injection of SPP induced a rapid and transient Ca2+ mobilization in HEK-293 cells which was not antagonized by heparin. We conclude that mAChRs utilize the sphingosine kinase-SPP pathway in addition to PLC-IP3 to mediate Ca2+ mobilization. As Ca2+ signalling by various, but not all, GPCRs in different cell types was likewise attenuated by the sphingosine kinase inhibitors, we suggest a general role for sphingosine kinase, besides PLC, in mediation of GPCR-induced Ca2+ signalling.

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