Metabolic fate of exogenous sphingosine in neuroblastoma neuro2A cells: Dose-dependence and biological effects

Laura Riboni, Rosaria Bassi, Antonella Caminiti, Alessandro Prinetti, Paola Viani, Guido Tettamanti

Research output: Contribution to journalArticlepeer-review

Abstract

The possible relationship between metabolism and biological effects of sphingosine was investigated in Neuro2a cells. [C3-3H]-sphingosine, administered at different doses (80 pmol-80 nmol/mg cell protein). Amounts up to hundredfold were rapidly taken up and metabolized, the intracellular content of sphingosine being processed within 2h. At low doses, [3H]-sphingosine represented a minor portion of the cellular radiolabel, and N-acylated metabolites, particularly ceramide, prevailed over degradation products. Neuro2a cell differentiation took place in conjunction with ceramide increase. At increasing exogenous sphingosinc/cell ratio, the acylation process became saturated while sphingosine degradation increased proportionally. From this point on [3H]-sphingosinc accumulated and cell toxicity occurred. In conclusion, in Neuro2a cells the biological effects exerted by exogenous sphingosine are strictly connected to the exogenous sphingosine/cell ratio and to the capacity of the cell to metabolize sphingosine.

Original languageEnglish
Pages (from-to)46-56
Number of pages11
JournalAnnals of the New York Academy of Sciences
Volume845
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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