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Insulin-like growth factor 1 prevents neuronal cell death induced by corticosterone through activation of the

Atsumi Nitta1, Wen-Hua Zheng, Rémi Quirion

  • 1Department of Psychiatry, McGill University, Verdun-Montreal, PQ, Canada.

Journal of Neuroscience Research
|March 30, 2004
PubMed

Insights

Insulin-like growth factor-1 (IGF-1) protects hippocampal neurons from corticosterone (CORT)-induced damage. This neuroprotection is mediated by the activation of the phosphatidylinositide 3-kinase (PI3K)/Akt pathway, highlighting a potential therapeutic target.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Corticosterone (CORT) is known to cause neuronal damage in the hippocampus.
  • The exact mechanisms behind CORT-induced neurotoxicity are not fully understood.
  • Insulin-like growth factor-1 (IGF-1) is a key factor in neuronal survival.

Purpose of the Study:

  • To investigate the protective role of IGF-1 against CORT-induced neuronal cell death.
  • To elucidate the specific molecular pathways involved in IGF-1's neuroprotective effects.

Main Methods:

  • Primary hippocampal neurons were cultured and exposed to CORT.
  • IGF-1 was administered to assess its protective effects against CORT-induced cell death.
  • The involvement of the PI3K/Akt pathway was examined using specific inhibitors (LY29004, PD98059).

Main Results:

  • CORT induced significant neuronal cell death at 50 nM.
  • IGF-1 (10 nM) effectively prevented CORT-induced neuronal death.
  • IGF-1 treatment reversed CORT-induced inhibition of the Akt pathway.
  • Inhibition of PI3K blocked IGF-1's neuroprotective effect, while MEK inhibition had no impact.

Conclusions:

  • IGF-1 confers neuroprotection against CORT-induced cell death in hippocampal neurons.
  • The PI3K/Akt pathway is critically involved in mediating IGF-1's protective effects.
  • Modulating the PI3K/Akt pathway represents a potential strategy for mitigating CORT-induced neurotoxicity.

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