Abstract
Sphingolipids such as sphingosine 1-phosphate (SPP) and sphingosylphosphorylcholine have long been recognized to possess Ca2+mobilizing activity, yet to date little is known about their mechanism of action, or indeed their significance as Ca2+mobilizing intracellular messengers. The recent discovery of extracellular receptors for the sphingolipids has further complicated the interpretation of many experiments in this field. This paper reviews the current literature in which molecular and pharmacological approaches have begun to uncover the signalling components associated with intracellular SPP production and Ca2+mobilization. The functional significance of this novel Ca2+release pathway is also discussed.
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