3-Ketosphinganine provokes the accumulation of dihydroshingolipids and induces autophagy in cancer cells

Yadira F. Ordóñez, Jèssica González, Carmen Bedia, Josefina Casas, José Luis Abad, Antonio Delgado, Gemma Fabrias

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

11 Citas (Scopus)


Although several reports describe the metabolic fate of sphingoid bases and their analogs, as well as their action and that of their phosphates as regulators of sphingolipid metabolizing-enzymes, similar studies for 3-ketosphinganine (KSa), the product of the first committed step in de novo sphingolipid biosynthesis, have not been reported. In this article we show that 3-ketosphinganine (KSa) and its dideuterated analog at C4 (d2KSa) are metabolized to produce high levels of dihydrosphingolipids in HGC27, T98G and U87MG cancer cells. In contrast, either direct C1 O-phosphorylation or N-acylation of d2KSa to produce dideuterated ketodihydrosphingolipids does not occur. We also show that cells respond to d2KSa treatment with induction of autophagy. Time-course experiments agree with sphinganine, sphinganine 1-phosphate and dihydroceramides being the mediators of autophagy stimulated by d2KSa. Enzyme inhibition studies support that inhibition of Des1 by 3-ketobases is caused by their dihydroceramide metabolites. However, this effect contributes to increasing dihydrosphingolipid levels only at short incubation times, since cells respond to long time exposure to 3-ketobases with Des1 overexpression. The translation of these overall effects into cell fate is discussed.

Idioma originalInglés
Páginas (desde-hasta)1166-1173
Número de páginas8
PublicaciónMolecular BioSystems
EstadoPublicada - 2016
Publicado de forma externa

Nota bibliográfica

Publisher Copyright:
© The Royal Society of Chemistry 2016.


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