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MAPK activation in nociceptive neurons and pain hypersensitivity
1Department of Anatomy and Neuroscience, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan.
Life Sciences
|March 26, 2004
Summary
Mitogen-activated protein kinase (MAPK) pathways, including extracellular signal-regulated protein kinase (ERK), contribute to pain hypersensitivity. Inhibiting MAPK signaling in nociceptive neurons may lead to new pain relief strategies.
Area of Science:
- Neuroscience
- Molecular Biology
- Pain Research
Background:
- Mitogen-activated protein kinases (MAPKs), such as extracellular signal-regulated kinase (ERK), are crucial for intracellular signal transduction.
- ERK plays a role in neuronal plasticity, learning, and memory.
Purpose of the Study:
- To review recent data on the role of MAPK pathways in neuronal plasticity underlying pain hypersensitivity.
- To explore the involvement of ERK and p38 MAPK in nociceptive neurons during pain states.
Main Methods:
- Review of accumulating data on MAPK pathway activation in the dorsal root ganglion (DRG) and dorsal horn.
- Analysis of ERK and p38 MAPK activation in response to noxious stimuli, inflammation, and nerve injury.
Main Results:
- ERK phosphorylation in DRG and dorsal horn neurons is activated by noxious stimuli and nerve injury.
- MAPK activation in nociceptive neurons contributes to persistent inflammatory and neuropathic pain via transcriptional regulation.
- p38 MAPK is also activated in DRG neurons following inflammation and axotomy.
Conclusions:
- MAPK activation in nociceptive neurons contributes to pain hypersensitivity through both transcription-dependent and -independent mechanisms.
- Inhibiting MAPK signaling in primary afferents and the spinal cord presents a promising strategy for developing novel analgesics.