鞘氨醇
神经酰胺
鞘氨醇激酶
脂质信号
1-磷酸鞘氨醇
磷脂酰丝氨酸
膜联蛋白
程序性细胞死亡
鞘氨醇激酶1
细胞生物学
生物化学
激酶
化学
生物
细胞凋亡
酶
磷脂
受体
膜
作者
Syed M. Qadri,Julia Bauer,Christine Zelenak,Hasan Mahmud,Yuliya Kucherenko,Seung Hun Lee,Klaus Ferlinz,Florian Läng
摘要
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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