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Delayed neuronal cell death in the rat hippocampus is mediated by the mitogen-activated protein kinase signal

H Ozawa1, S Shioda, K Dohi

  • 1Department of Neurosurgery, Showa University School of Medicine, Tokyo, Japan.

Neuroscience Letters
|March 17, 1999
PubMed

Insights

Brain ischemia triggers delayed neuronal cell death (apoptosis) in the hippocampus. Mitogen-activated protein kinase pathways, particularly JNK/SAPK and p38, are activated and contribute to this apoptosis.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Transient global ischemia, induced by cardiac arrest, causes delayed neuronal cell death (apoptosis) in the CA1 region of the rat hippocampus.
  • Understanding the molecular mechanisms regulating apoptosis in vivo is crucial for developing neuroprotective strategies.

Purpose of the Study:

  • To investigate the role of mitogen-activated protein kinase (MAPK) family members in regulating apoptosis following brain ischemia-reperfusion.
  • To characterize the activation patterns of JNK/SAPK, ERK, and p38 enzymes in the hippocampus after ischemic injury.

Main Methods:

  • Induction of transient global ischemia in rats via 5 minutes of cardiac arrest.
  • Analysis of MAPK enzyme activation (JNK/SAPK, ERK, p38) in the hippocampal region post-ischemia-reperfusion.

Main Results:

  • Ischemia-reperfusion significantly activated JNK/SAPK (c-Jun NH2-terminal protein kinase/stress activated protein kinase), ERK (extracellular signal-regulated kinase), and p38 enzymes.
  • Strong activation of these MAPK pathways was observed in the hippocampal region.

Conclusions:

  • The activation of JNK/SAPK and p38 pathways plays a significant role in inducing apoptosis in CA1 neurons after brain ischemia-reperfusion.
  • These findings contribute to understanding the molecular regulation of neuronal cell death in ischemic conditions.

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