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Metabolic Formation of Ceramide-1-Phosphate in Cerebellar Granule Cells: Evidence for the Phosphorylation of Ceramide by Different Metabolic Pathways

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Abstract

Aiming to investigate the possible production of ceramide-1-phosphate from complex sphingolipid metabolism in neurons, we administered radiolabeled sphingolipids to cerebellar granule cells and inspected the formation of labeled ceramide-1-phosphate in different experimental conditions. We report that differentiated granule cells are capable to form Cer-1-P via ceramide derived from SM degradation at the plasma membrane level. Moreover we observed that ceramide-1-phosphate can be also produced from a metabolic pathway not involving SM degradation. In particular, we obtained evidence that ceramide, synthesized via the recycling of sphingosine produced from ganglioside catabolism, can also be the precursor of ceramide-1-phosphate. We also found that undifferentiated and differentiated granule cells display different capacities to phosphorylate Cer produced by the two different metabolic pathways. The results here obtained demonstrate that cerebellar neurons are able to metabolically produce ceramide-1-phosphate and support that this molecule may serve a potential role in sphingoid-mediated signaling in the nervous system.

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Authors and Affiliations

  1. Department of Medical Chemistry and Biochemistry, Study Center for the Functional Biochemistry of Brain Lipids, University of Milan, via Fratelli Cervi 93, LITA-Segrate, 20090, Segrate, Milan, Italy

    Laura Riboni, Rosaria Bassi, Viviana Anelli & Paola Viani

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  1. Laura Riboni
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  2. Rosaria Bassi
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  3. Viviana Anelli
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  4. Paola Viani
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Riboni, L., Bassi, R., Anelli, V. et al. Metabolic Formation of Ceramide-1-Phosphate in Cerebellar Granule Cells: Evidence for the Phosphorylation of Ceramide by Different Metabolic Pathways. Neurochem Res 27, 711–716 (2002). https://doi.org/10.1023/A:1020236419556

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