Differential regulation of AKT, MAPK and GSK3β during C2-ceramide-induced neuronal death

Gonzalo Arboleda, Yolanda Cárdenas, Yeldy Rodríguez, Luis Carlos Morales, Luisa Matheus, Humberto Arboleda

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Evidence has implicated apoptosis as a mechanism underlying cell demise in diverse neurodegenerative diseases including Parkinson's disease (PD). Endogenous toxins and other stress signals activate the sphingomyelin pathway increasing the levels of ceramide, an important regulator of cell death.In the present paper we have analysed the contribution of PI3K/AKT-GSK3β and MAPK (ERK and JNK) pathways to cell death in a catecholaminergic cell line following exposure to C2-ceramide. We also explored the potential neuroprotective action of insulin-like growth factor-1 (IGF-1) and neurotrophin-3 (NT3).We demonstrated that C2-ceramide-induced cell death is associated to an early decrease in phosphorylation (inhibition) of PI3K/AKT and ERK, followed by phosphorylation (activation) of JNK and de-phosphorylation (activation) of glycogen synthase kinase-3 beta (GSK3β). NT3 and IGF-1 increased survival at early time points, but only IGF-1 is capable to attenuate C2-ceramide-mediated neuronal death, and this neuroprotection is associated to strong and permanent activation of AKT and inhibition of GSK3β. In conclusion, C2-ceramide initiates a series of events including an early inactivation of PI3K/AKT and ERK pathways followed by activation of JNK and activation of GSK3β and neuronal death, changes that are counteracted by IGF-1.

Original languageEnglish (US)
Pages (from-to)687-693
Number of pages7
JournalNeuroToxicology
Volume31
Issue number6
DOIs
StatePublished - Dec 2010

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Toxicology

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