Activated Glia Induce Neuron Death Via MAP Kinase Signaling Pathways Involving JNK and p38

Zhong Xie, Carolyn J. Smith, Linda J. Van Eldik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

Abstract

Chronic glial activation in neurodegenerative diseases contributes to neuronal dysfunction and neuron loss through production of neuroinflammatory molecules. However, the molecular mechanisms, particularly the signal transduction pathways involved in glia-dependent neuron death, are poorly understood. As a first step to address this question, we used a neuron-glia co-culture system that allows diffusion of soluble molecules between glia and neurons to test the potential importance of mitogen-activated protein kinase (MAPK) signaling pathways in the glia-induced neuron death. Activation of glia in co-culture by lipopolysaccharide (LPS) induced apoptotic-like neuron death. The MAPKs tested (p38, JNK, ERK1/2) were activated in both glia and neurons following LPS treatment, suggesting their involvement in both glial activation and neuronal response to diffusible, glia-derived neurotoxic molecules. Inhibitors of p38 and JNK partially blocked neuron death in the LPS-treated co-culture, whereas an ERK1/2 pathway inhibitor did not protect neurons. These results show that p38 and JNK MAPKs, but not ERK1/2 MAPK, are important signal transduction pathways contributing to glia-induced neuron death.

Original languageEnglish (US)
Pages (from-to)170-179
Number of pages10
JournalGlia
Volume45
Issue number2
DOIs
StatePublished - Jan 15 2004

Keywords

  • Alzheimer's disease
  • Apoptosis
  • Glial activation
  • Kinase
  • Microglia
  • Neuroinflammation
  • Signal transduction

ASJC Scopus subject areas

  • Neurology
  • Cellular and Molecular Neuroscience

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