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Updated: Aug 24, 2026

Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons
10:36

Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons

Published on: November 6, 2017

ERK activation promotes neuronal degeneration predominantly through plasma membrane damage and independently of

Srinivasa Subramaniam1, Ute Zirrgiebel, Oliver von Bohlen Und Halbach

  • 1Neuroanatomy and Interdisciplinary Center for Neurosciences, University of Heidelberg, Im Neuenheimer Feld 307, 2. OG, D-69120 Heidelberg, Germany. Srinivasa.Subramaniam@urz.uni-heidelberg.de

The Journal of Cell Biology
|May 5, 2004
PubMed

Insights

Extracellular-regulated protein kinase (ERK) drives neuronal death after potassium withdrawal. This ERK-mediated damage, characterized by nuclear condensation and plasma membrane damage, occurs independently of caspase-3, revealing a novel cell death pathway.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Extracellular-regulated protein kinase (ERK) is implicated in neuronal cell death.
  • Cerebellar granule neurons (CGN) undergo cell death upon potassium withdrawal.

Purpose of the Study:

  • To investigate the role of ERK in CGN death phenotypes after potassium withdrawal.
  • To elucidate the mechanism of ERK-mediated neuronal damage.

Main Methods:

  • Culturing CGN in low potassium conditions.
  • Utilizing pharmacological inhibitors (U0126) and genetic manipulation (dominant-negative and constitutively active MEK) to modulate ERK activity.
  • Assessing neuronal damage through plasma membrane integrity, DNA damage, and nuclear condensation.
  • Investigating the involvement of caspase-3 and subcellular localization of ERK and caspase-3.

Main Results:

  • Potassium withdrawal induces heterogeneous CGN death phenotypes, including plasma membrane (PM) damage and nuclear condensation, preceding DNA damage.
  • Inhibition of ERK activation significantly reduces PM damage and nuclear condensation.
  • Overexpression of active MEK exacerbates PM damage and nuclear condensation.
  • ERK-mediated neuronal damage is independent of caspase-3, with active ERK translocating to the nucleus while caspase-3 remains cytoplasmic.
  • Antioxidants reduced ERK activation and PM damage but did not affect caspase-3 or DNA damage.

Conclusions:

  • ERK is a key executor of neuronal damage in CGN following potassium withdrawal.
  • ERK-mediated neuronal death involves a caspase-3-independent pathway.
  • ERK activation leads to nuclear condensation and plasma membrane damage, distinct from caspase-3-dependent apoptosis.

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