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Sphingosine but not sphingosine-1-phosphate stimulates suicidal erythrocyte death

机译:鞘氨醇而不是1-磷酸鞘氨醇刺激自杀性红细胞死亡

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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. [Ca~(2+)]_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 [Ca~(2+)]_i, decreased cell volume and increased PS-exposure. The observations disclose sphingosine, but not sphingosine-1-phosphate, as a strong inducer of eryptosis.
机译:鞘氨醇激酶1使鞘氨醇磷酸化,鞘氨醇通过神经酰胺合成酶转化为神经酰胺。神经酰胺引发隐匿性自杀,自杀性红细胞死亡的特征是细胞收缩和红细胞表面磷脂酰丝氨酸(PS)暴露。红细胞缺乏磷酸鞘氨醇降解酶,因此储存了大量磷酸鞘氨醇。本研究探讨了鞘氨醇和磷酸鞘氨醇对隐匿性的影响。 [Ca〜(2 +)] _ i是通过FACS分析中的Fluo3荧光,前向散射的细胞体积和膜联蛋白V结合的PS暴露估算的。鞘氨醇(0.1-10μM)而不是鞘氨醇1-磷酸(0.1-10μM)增加[Ca〜(2 +)] _ i,减少细胞体积并增加PS暴露。观察结果显示鞘氨醇,而不是鞘氨醇-1-磷酸,是强力隐性诱导剂。

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