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Mitogen-activated protein kinases phosphorylation in posttraumatic selective vulnerability in rats

N Otani1, H Nawashiro, N Tsuzuki

  • 1Department of Neurosurgery, National Defense Medical College, Tokorozawa, Saitama, Japan. grd1405@gr.ndmc.ac.jp

Acta Neurochirurgica. Supplement
|February 3, 2004
PubMed

Insights

Fluid percussion injury (FPI) activates specific Mitogen-activated protein kinase (MAPK) pathways, including extracellular signal-regulated protein kinase (ERK) and c-Jun NH2-terminal kinase (JNK), in the rat brain. These pathways play a role in the brain's response to traumatic injury.

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Molecular Biology

Background:

  • Mitogen-activated protein kinase (MAPK) pathways regulate cellular responses to external stimuli.
  • Key MAPK cascades include extracellular signal-regulated protein kinase (ERK), c-Jun NH2-terminal kinase (JNK), and p38.
  • Understanding MAPK activation post-traumatic brain injury (TBI) is crucial for elucidating cellular signaling.

Purpose of the Study:

  • To investigate the distribution and role of activated MAPK pathways following fluid percussion injury (FPI) in a rat model.
  • To determine which specific MAPK pathways (ERK, JNK, p38) are activated after FPI.
  • To map the cellular localization of activated MAPK signaling in the injured brain.

Main Methods:

  • Induction of FPI in a rat model to simulate traumatic brain injury.
  • Immunohistochemical analysis to detect phosphorylated (activated) forms of ERK, JNK, and p38.
  • Double immunostaining to identify specific cell types expressing activated MAPK pathways.

Main Results:

  • FPI significantly increased ERK and JNK phosphorylation in the cortex and hippocampus at the injury site.
  • p38 phosphorylation was not significantly altered by FPI.
  • Phospho-ERK immunoreactivity was observed in superficial neuronal layers, dentate hilar neurons, and CA3 neurons within 30 minutes post-FPI.
  • Activated ERK was found in astrocytes 6 hours after TBI.

Conclusions:

  • MAPK pathways, particularly ERK and JNK, are activated following FPI.
  • Activated ERK signaling is present in neurons and astrocytes after traumatic brain injury.
  • These findings suggest a role for MAPK pathways in the cellular signal transduction processes initiated by FPI.

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