Neuroprotection by NGF in the PC12 in vitro OGD model: involvement of mitogen-activated protein kinases and gene expression

Ann N Y Acad Sci. 2005 Aug:1053:84-96. doi: 10.1196/annals.1344.008.

Abstract

Neurodegenerative disorders and chronic disability due to stroke in the brain or spinal cord afflict a large sector of the population. To investigate the mechanism involved in ischemic stroke and to develop neuroprotective drugs/therapies, in vivo and in vitro, pharmacological models are needed. To investigate the cellular and molecular neuroprotective mechanisms of nerve growth factor (NGF), a member of the nervous system neurotrophin family of growth factors, under ischemia, we used an oxygen-glucose-deprivation (OGD) device and pheochromocytoma PC12 cells exposed to a paradigm of ischemic insult. Pretreatment of the cultures with 50 ng/mL of NGF, 18 h prior to OGD insult, conferred 30% of neuroprotection. Time-course experiments showed marked activation of the ERK, JNK, and p-38 MAPK isoforms during the OGD phase, but not during OGD reperfusion. Pretreatment of the cultures with 50 ng/mL of NGF, 18 h prior to OGD insult, resulted in 50% attenuation of OGD-induced activation of JNK 1, and 20% and 50% attenuation of OGD-induced activation of p-38 alpha and beta, respectively. The effect of NGF on gene expression in the PC12 ischemic model using Affymatrix Rat DNA-Microarray technology indicates that only 6% of the genes are differentially regulated (induced/suppressed) by OGD insult and/or NGF. These findings support the notion that pretreatment with NGF confers neuroprotection from OGD insult, a phenomenon coincidentally related to differential inhibition of MAPK stress kinase isoforms and differential gene expression. This ischemic model may be useful to investigate molecular mechanisms of OGD-induced neurotoxicity and NGF-induced neuroprotection, and to generate novel therapeutic concepts for stroke treatment.

Publication types

  • Review

MeSH terms

  • Animals
  • Brain Ischemia / drug therapy
  • Brain Ischemia / prevention & control
  • Gene Expression / drug effects*
  • Glucose / deficiency*
  • Hypoxia, Brain / pathology*
  • Mitogen-Activated Protein Kinases / physiology*
  • Nerve Growth Factors / pharmacology*
  • Neuroprotective Agents*
  • PC12 Cells
  • Rats
  • Stroke / drug therapy
  • Stroke / prevention & control

Substances

  • Nerve Growth Factors
  • Neuroprotective Agents
  • Mitogen-Activated Protein Kinases
  • Glucose