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Sphingosine kinase regulation and cardioprotection Karliner JSCardiovasc Res 2009[May]; 82 (2): 184-92Activation of sphingosine kinase/sphingosine-1-phosphate (SK/S1P)-mediated signalling has been recognized as critical for cardioprotection in response to acute ischaemia/reperfusion injury. Incubation of S1P with cultured cardiac myocytes subjected to hypoxia or treatment of isolated hearts either before ischaemia or at the onset of reperfusion (pharmacologic pre- or postconditioning) results in reduced myocyte injury. Synthetic agonists active at S1P receptors mimic these responses. Gene-targeted mice null for the SK1 isoform whose hearts are subjected to ischaemia/reperfusion injury exhibit increased infarct size and respond poorly either to ischaemic pre- or postconditioning. Measurements of cardiac SK activity and S1P parallel these observations. Ischaemic postconditioning combined with sphingosine and S1P rescues the heart from prolonged ischaemia. These observations may have considerable relevance for future therapeutic approaches to acute and chronic myocardial injury.|Animals[MESH]|Disease Models, Animal[MESH]|Humans[MESH]|Lysophospholipids/*physiology[MESH]|Mice[MESH]|Myocardial Reperfusion Injury/physiopathology/*prevention & control[MESH]|Phosphotransferases (Alcohol Group Acceptor)/*physiology[MESH]|Rats[MESH]|Sphingosine/*analogs & derivatives/physiology[MESH] |
