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Publikationstyp: Zeitschriftenaufsatz
Dokumenttyp: Originalarbeit

Jahr: 2017

AutorInnen: Zimmermann, L; Moldzio, R; Vazdar, K; Krewenka, C; Pohl, EE

Titel: Nutrient deprivation in neuroblastoma cells alters 4-hydroxynonenal-induced stress response.

Quelle: Oncotarget. 2017; 8(5):8173-8188



Autor/innen der Vetmeduni Vienna:

Krewenka Christopher
Moldzio Rudolf
Pohl Elena
Zimmermann Lars

Beteiligte Vetmed-Organisationseinheiten
Institut für Physiologie, Pathophysiologie und Biophysik, Abteilung für Physiologie und Biophysik
Institut für Medizinische Biochemie


Zugehörige(s) Projekt(e): Mechanismus der UCP-Aktivierung durch reaktive Aldehyde


Abstract:
4-hydroxy-2-nonenal (HNE), a toxic lipid peroxidation product, is associated with oxidative damage in cells and involved in various diseases including the initiation and progression of cancer. Cancer cells have a high, adaptable metabolism with a shift from oxidative phosphorylation to glycolysis and rely on high levels of glucose and glutamine as essential nutrients for cell growth. Here we investigated whether the toxic effects of HNE on the mitochondrial membrane potential (MMP) of cancer cells depends on their metabolic state by deprivation of glucose and/or glutamine. The addition of 16 μM HNE to N18TG2 neuroblastoma cells incubated in glucose medium led to a severe reduction of MMP, which was similar to the MMP of cells fed with both glucose and glutamine. In contrast, HNE addition to cells starved in glutamine medium increased their MMP slightly for a prolonged time period and this was accompanied by increased cellular survival. We found that ß-oxidation of HNE did not cause the increased MMP, since the aldehyde dehydrogenase was distinctly more active in cells with glucose medium. However, after blocking fatty acid ß-oxidation in cells starved in glutamine medium with etomoxir, which inhibits carnitine palmitoyltransferase 1, HNE addition induced a strong reduction of MMP similar to cells in glucose medium. Surprisingly, the effect of more toxic 4-oxo-2-nonenal was less pronounced. Our results suggest that in contrast to cells fed with glucose, glutamine-fed cancer cells are capable of ß-oxidizing fatty acids to maintain their MMP to combat the toxic effects of HNE.

Keywords Pubmed: Aldehydesmetabolismtoxicity
Animals
Cell Line, Tumor
Cell Shapedrug effects
Cell Survivaldrug effects
Energy Metabolismdrug effects
Glucosedeficiency
Glutaminedeficiency
Lipid Peroxidationdrug effects
Membrane Potential, Mitochondrialdrug effects
Mice
Mitochondriadrug effectsmetabolismpathology
Neuroblastomametabolismpathology
Oxidation-Reduction
Oxidative Stressdrug effects
Time Factors

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