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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
09:18

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

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

Gonzalo Arboleda1, Yolanda Cárdenas, Yeldy Rodríguez

  • 1Grupo de Neurociencias, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, Colombia. gharboledab@unal.edu.co

Neurotoxicology
|August 11, 2010
PubMed

Insights

Ceramide triggers neuronal death pathways in Parkinson's disease models. Insulin-like growth factor-1 (IGF-1) protects neurons by activating AKT and inhibiting GSK3β, counteracting ceramide-induced apoptosis.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Apoptosis contributes to neuronal death in neurodegenerative diseases like Parkinson's disease (PD).
  • Ceramide, a sphingomyelin pathway regulator, plays a key role in stress-induced cell death.
  • Understanding signaling pathways involved in ceramide-induced neurotoxicity is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the roles of PI3K/AKT-GSK3β and MAPK (ERK, JNK) pathways in C(2)-ceramide-induced cell death.
  • To explore the neuroprotective potential of insulin-like growth factor-1 (IGF-1) and neurotrophin-3 (NT3) against ceramide toxicity.

Main Methods:

  • Utilized a catecholaminergic cell line exposed to C(2)-ceramide.
  • Analyzed the phosphorylation status of key signaling proteins including AKT, ERK, JNK, and GSK3β.
  • Assessed the effects of IGF-1 and NT3 on cell survival and signaling pathway activation.

Main Results:

  • C(2)-ceramide induced cell death associated with early PI3K/AKT and ERK inhibition, followed by JNK activation and GSK3β activation.
  • Both NT3 and IGF-1 promoted survival at early stages.
  • IGF-1 effectively attenuated C(2)-ceramide-mediated neuronal death, linked to sustained AKT activation and GSK3β inhibition.

Conclusions:

  • C(2)-ceramide triggers neuronal death via inactivation of PI3K/AKT and ERK, and activation of JNK and GSK3β.
  • IGF-1 demonstrates significant neuroprotective effects against ceramide toxicity by modulating these critical signaling pathways.

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