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Sphingosine but not Sphingosine-1-phosphate Stimulates Suicidal Erythrocyte DeathQadri S.M.1 · Bauer J.1 · Zelenak C.1 · Mahmud H.1 · Kucherenko Y.1 · Lee S.H.2 · Ferlinz K.1,* · Lang F.1
1Department of Physiology, University of Tübingen, Tübingen2Yonsei University College of Medicine, Seoul,*current address: The Medicines Company Deutschland GmbH, Munich Corresponding Author
Prof. Dr. Florian Lang
Physiologisches Institut der Universität Tübingen
Gmelinstr. 5, 72076 Tübingen (Germany)
Tel. +49 7071 29 72194, Fax +49 7071 29 5618
Sphingosine kinase 1 phosphorylates sphingosine, which is converted to ceramide by ceramide synthetase. Ceramide triggers eryptosis, the suicidal erythrocyte death characterized by cell shrinkage and phosphatidylserine (PS) exposure at the erythrocyte surface. Erythrocytes lack sphingosine phosphate-degrading enzymes and thus store large quantities of sphingosine phosphate. The present study explored the influence of sphingosine and sphingosine phosphate on eryptosis. [Ca2+]i, was estimated from Fluo3 fluorescence, cell volume from forward scatter and PS exposure from annexin V-binding in FACS analysis. Sphingosine (0.1 – 10 µM) but not sphingosine-1- phosphate (0.1 – 10 µM) increased [Ca2+]i, decreased cell volume and increased PS-exposure. The observations disclose sphingosine, but not sphingosine-1-phosphate, as a strong inducer of eryptosis.
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