sphingosine-1-phosphate and acrylic-acid

C18-sphingosine 1-phosphate (C18-SPP) is a sphingolipid with important functional and structural roles in cells. In this paper we report a new capillary electrophoresis technique that is coupled to a laser-induced fluorescence detection (CE-LIF) method to quantify the level of C18-SPP in biological samples. The method utilizes a commercial standard C17-sphingosine 1-phosphate (C17-SPP) derivatized with naphthalene-2,3-dicarboxaldehyde (NDA), a fluorogenic dye used to label primary amines. The detection limit for the C17-SPP NDA was 0.54 fmol. We quantified the C18-SPP in leukemic human cells before and after irradiation by gamma rays. We demonstrated that the amounts of this sphingolipid decreased after the irradiation. In a second part of this work, we used the technique to evaluate the ability of a novel transparent fused-silica capillary, which allows the use of fused-silica capillaries without burning a window. Solarization, homogeneity, and sensitivity were studied using this capillary. The results demonstrate that this new durable capillary can provide a sensitive and reproducible quantitation procedure for CE-LIF studies.

Topics: Acrylates; Cell Line, Tumor; Electrophoresis, Capillary; Humans; Imides; Kinetics; Lasers; Lysophospholipids; Molecular Structure; Silicon Dioxide; Spectrometry, Fluorescence; Spectrometry, Mass, Electrospray Ionization; Sphingosine; Tandem Mass Spectrometry