title: Sustained decrease in plasma sphingosine-1-phosphate concentration and its accumulation in blood cells in acute myocardial infarction.
abstract: Sphingosine-1-phosphate (S1P) is a cardioprotective sphingolipid present at high concentration in plasma and blood cells. However, effect of the myocardial infarction on S1P metabolism in blood is poorly recognized. Therefore, we aimed to examine the dynamics of changes in concentration of sphingolipids in blood of patients with acute ST-segment elevation myocardial infarction (STEMI). The study was performed on two groups of subjects: healthy controls (n=32) and patients with STEMI (n=32). In the latter group blood was taken upon admission to intensive heart care unit, and then on the second, fifth and thirtieth day, and approximately two years after admission. STEMI patients showed decreased plasma S1P concentration and accumulation of free sphingoid bases and their 1-phosphates in erythrocytes. This effect was already present upon admission, and was maintained for at least thirty days after the infarction. Interestingly, two years post-infarction plasma S1P level recovered only partially, whereas the content of erythrocyte sphingolipids decreased to the values observed in the control subjects. The most likely reason for the observed reduction in plasma S1P level was its decreased release or increased degradation by vascular endothelial cells, as we did not find any evidence for downregulation of S1P synthesis or release by blood cells. We conclude that patients with STEMI are characterized by marked alterations in sphingolipid metabolism in blood which could be a consequence of the infarction itself, the antiplatelet treatment given or both. Our data suggest that cardioprotective action of S1P may be diminished in patients with acute myocardial infarction.
authors.affiliation: Department of Cardiology, Medical University of Białystok, Skłodowskiej-Curie 24a, 15-276 Białystok, Poland.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Knapp
authors.forename: Anna
authors.initials: A
authors.lastname: Lisowska
authors.forename: Piotr
authors.initials: P
authors.lastname: Zabielski
authors.forename: Włodzimierz
authors.initials: W
authors.lastname: Musiał
authors.forename: Marcin
authors.initials: M
authors.lastname: Baranowski
mesh_terms: D000208:Acute Disease; D000368:Aged; D004912:Erythrocytes / Q000378:metabolism*; D005260:Female; D006801:Humans; D008246:Lysophospholipids / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood*; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000097:blood
chemical_list: D008246:Lysophospholipids; C060506:sphingosine 1-phosphate; D013110:Sphingosine
keywords: Ceramide; Human; Red blood cells; Sphinganine; Sphingosine kinase; Thrombocytes